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Usfos User`s Manual (Chp. 6(I))

1. CONSIMAS This record is used to describe use of the consistent mass formulation ref USFOS Theory Manual Sect 14 This record is given only once SYSDAMP Switch Parameter Description Default switch Switch ON OFF 0 Switch 0 Switch OFF system damping Switch 1 Switch ON system damping This record is used to switch ON system damping formulation forming a separate Co matrix By default if Sysdamp is not specified in the input Co is not established and only Rayleigh system damping is available It is recommended to switch Sysdamp ON if discrete dashpot dampers are defined the dashpot damping terms will be added to Co matrix on top of the usual Rayleigh coefficients This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 22 Input Description USFOS Control Parameters Ini_Velo Type Time Vx Vy Vz rvx rVy rVvz_ iId_1 Parameter Description Default Type Data type used to specify initial velocity at nodes Node The specified Id s are node numbers which all should be assigned to the initial velocity at the specified time Mat i The specified Id s are material numbers All nodes in contact with elements with the specified material numbers will all be assigned to the initial velocity at the specified time Time for the velocity to be initialized Velocoty X component Velocoty Y componet etc Velocoty component rotation about X axis etc Node number 1 if Typ
2. USFOS 2010 01 01 USFOS USER S MANUAL 6 3 124 Input Description USFOS Control Parameters 6 3 17 Aerodynamics amp The OLD input syntax WINDFIELD _case T ini Z bott Uio Powert Rho WOx WOy WOz alpha betai gamma n_ini Parameter Description Default _case Load case number The wind is activated by using the LOADHIST command referring to this load case number a TIMEHIST of type 3 T_ini Time for applying the pre generated fluctuating windfield Unit Z bott Lower level of mean wind profile m U10 Mean wind 10 meter above Z_bott m s Power power law coeff defining the mean wind profile U U 19 z 10 P Rho Air Density kg m WO_x Wind Origo x coordinate in global system m WO_y Wind Origo y coordinate in global system m WO_z Wind Origo z coordinate in global system m alpha Rotation of wind axes about global x axis deg beta Rotation of wind axes about global y axis deg gamma Rotation of wind axes about global z axis deg n_ini Number of points in the initialization curve for the fluctuating wind 0 With this record the user may specify a windfield to be applied to the structure as aerodynamical forces The wind is switched ON according to the LOADHIST TIMEHIST definition TIMEHIST type 3 must be used Time between calculation of wave forces is controlled by the referred TIMEHIST record dTime The calculated wave forces are written to file if WAVCASE1 is specified in the control
3. SURF2OFF Parameter Description Default Switch off two surface model Elasto plastic transition not performed This record overrides default data and data specified on CPROPAR record ARC_OFF Parameter Description Default Switch off arc length control This record overrides default data and data specified on CPROPAR record DETEROFF Parameter Description Default Switch off determinant check This record overrides default data and data specified on CPROPAR record DENT_OFF Parameter Description Default Switch off formulation of dented tubes and local buckling This record overrides default data and data specified on CPROPAR record USFOS 2010 01 01 USFOS USER S MANUAL 6 3 28 Input Description USFOS Control Parameters DENT_TYPE Parameter Description Default Type Dent formulation type 0 Default dent formulation 0 Cyclic dent formulation This record may be used to switch on the cyclic dent formulation This record is given once CMAXSTEP Max_step Parameter Description Default Max_step Max number of steps This record may be used to increase the max number of analysis steps availabe This record is given once EIGENVAL KeyWord Value Parameter Description Default Keyword Keyword describing the actual Value Time Definition of the time when the eigenval is performed NumberOf Specification of nuber of eigenvector to compute ModeScale_ Scaling of eigenvectors in connection with visua
4. CFRACT MFRACT but the results should be subjected to a separate validation by the user In particular the fracture criterion parameters should be carefully evaluated before application Local denting under the impact load is only calculated for tubular sections The impact analysis will be terminated if fracture occurs The CUSFOS line is somewhat different from the normal for the ship impact loadcase Example follows see CUSFOS description lt case gt lt fact gt lt mxla gt lt nstep gt lt minstp gt 3 1 0 0 0 50 0 01 Icomb Ship impact load case no lfact Load factor for the nodal load suggested by USFOS fact 1 0 is recommended mxid Max value of the suggested nodal load The maximum is unknown and is set equal to 0 nstep Max number of steps used to reach the defined energy minstp Min step see CUSFOS USFOS 2010 01 01 USFOS USER S MANUAL 6 3 81 Input Description USFOS Control Parameters MSHIP ship p1 p2 Parameter Description Default ship Ship material number p1 Collision load at zero indentation p2 Collision load at 50 of maximum indentation p3 Collision load at maximum indentation d1 Maximum indentation This record is used to define local ship indentation characteristics This record may be repeated The ship indentation and corresponding forces must be specified in units corresponding to external loads and nodal deformations As default the values recommended in 9 ar
5. Data Data required by the actual material type see below NOTE Zeros at the end of the record may be omitted With this record the user defines different types of material Elastic amp Plastic MATERIAL MATERIAL MatID MatID E Mod E Mod Poiss Poiss Elastic Plastic E Mod Poiss Dummy Yield Density ThermX Modulus of elasticity Poissons ratio Dummy parameter Yield stress Material Density Thermal Expansion Coefficient CompSpre amp TensSpri Dummy Density ThermxX Yield Density ThermxX Yield is dummy for elastic material Relevant for plastic material This material could be used together with dynamic simulations for a special beam formulation which his activated using the command BeamType 5 ListType IDList MATERIAL MATERIAL MatID MatID CompSpri TnesSpri Typ Typ Spring Behaviour Typ 1 Typ 2 Typ K Spring Stiffness Gap Gap Slack before spring is activated Density Material Density History This record may be repeated K Gap K Gap Density History Density History Spring length follows actual time history USFOS 2010 01 01 USFOS USER S MANUAL Input Description UFO Structural file format 6 5 30 USFOS MATERIAL Mat ID Grout E Yield Dens TensFac CompFac M Red l Red ShearFac Parameter Description Default Mat ID User defined material ID
6. Example 1 PIPE 45025 0 450 0 025 defines a pipe identified by the ID 45025 with outer diameter 0 45 and wall thickness 0 025 The shear area is not scaled calculated shear area is used directly Example 2 ID Do T ShY ShZ D2 PIPE 45025 0 450 0 025 1 1 0 250 defines a pipe identified by the ID 45025 with outer diameter 0 45 and wall thickness 0 025 The shear area is not scaled calculated shear area is used directly End 2 of all elements referring to this cross section get diameter 0 250 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 23 Input Description UFO Structural file format BOX Geom ID H T side T_bott T_top Width Shear _Y Shear Z Parameter Description Geom ID User defined external geometry number H Height of the profile T_side Thickness of the side walls of the RHS profile T_bott Thickness of the bottom flange of the profile T_top Thickness of the top flange of the profile Width Width of the box profile Shear_Y Shear area factor of Y axis Shear area Shear_Y Calculated shear area Shear_Z Shear area factor of Z axis Shear area Shear_Z Calculated shear area If Shear_Y and Shear_Z are omitted or equal to zero Shear_Z and Shear_Z are both set equal to 1 0 With this record the user defines a rectangular hollow cross section to be used in the finite element analysis This record may be repeated IHPROFIL GeomID H T web W top T_top W
7. Nonlinear spring Material number 2 etc With this record the the user may specify nonlinear spring elements to become invisible in XACT Example 1 Assuming materials 101 and 102 are of type MREF The command Invisibile Material 101 102 will make all non linear spring elements referred to any of the two materials invisible in XACT This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 95 Input Description USFOS Control Parameters GROUPDEF ID ListType List Parameter Description Default ID Group ID ListType Definition Type Element Element ID list Material Material ID list Geometry Geometry ID list Group Group ID list List of actual ID s This record is used to define an element group which could be referred to in connection with specification of f ex NONSTRU input Example 1 GroupDef 88 Geom 27304 27305 27306 All elements referring to one of the cross section geometry ID s 27304 27305 or 27306 will become a member in Geometry Group 88 Example 2 GroupDef 66 Mat 210355 210345 All elements referring to one of material ID s 210355 or 210345 will become a member in Material Group 66 Example 3 GroupDef 1001 Group 66 88 All elements which are members in one of the groups with ID s 66 or 88 will become a member in Group of groups 1001 Typical Use Original Model Using a few commands a large number of elements are def
8. This record is used to specify the loading history with load and displacement control parameters Sect 4 1 and Sect 4 2 2 Note In a restart analysis the load history up to the step from which calculations resumes must NOT be included in the CUSFOS record This record is given only once and no default values exist USFOS 2010 01 01 USFOS USER S MANUAL 6 3 9 Input Description USFOS Control Parameters CICYFOS nloads npostp mxpstp mxpdis Icomb Ifact mxld mxdisp nstep minstp Icomb Ifact mxid mxdisp nstep minstp lcomb Ifact mxid mxdisp nstep minstp Parameter Description Default nloads Number of load specifications Icomb lfact mxld nstep minstp Used in connection with restart of analyses Sect 4 7 npostp Number of load steps in the post collapse range mxpstp Max load step size in the post collapse range mxpdis Max incremental displacements in the post collapse range Suggested value is 1 0 Icomb Load combination or load case number Ifact Load factor Size of the initial unscaled load increment specified as a factor of the reference load mxld Max load level for current load vector Sect 4 1 mxdisp Max total displacement for current load vector nstep Max number of load steps for current load vector minstp Minimum load increment for automatic load step scaling Specified as a fraction of the reference load combination or load case Suggested value is 0 0001 mxi d where mxld is the max in the actual load co
9. if input is given in time history format the total displacement will be a multiple of this value and the instantaneous value of the time history assigned through the LOADHIST record If the displacement history defined in the referred TIMEHIST is the absolute displacements the reference values should be set 1 0 For movement in directions different from the global axes the reference values are used to define the actual directions see example 2 If input is given in the conventional CUSFOS format this value will be incremented in the same manner as external loads This record could be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 136 Input Description USFOS Control Parameters SFOS 2010 01 01 USFOS USER S MANUAL Input Description SESAM Structural file format 6 4 1 6 4 SESAM STRUCTURAL FILE FORMAT This section describes the input records of the FEM structural model and loads These records may be generated by the SESAM modules PREFRAME WAJAC and WALOCO Geometry Data Connectivity Data Cross Sectional Data Element Data Material Data Boundary Conditions Load and Temperature Increments Hydrodynamic Added Mass Nodes with point masses Nodes with inital conditions Super element definition GNODE GCOORD GELMNT1 GBEAMG GIORH GBOX GPIPE GELTH GECCEN GUNIVEC MGSPRNG MISOPL BNBCD BNTRCOS BELFIX BNLOAD BELOAD1 BGRAV BNWALO BEWALO1 BEISTE BEUSLO BEMA
10. s are listed Elements referring to mat are selected ID s Actual ID list Deg With this record the user defines how to define and update an element s local global transformation matrix This command is needed when zero length non linear springs are defined since the orientation of the local coordinate system cannot be defined in the normal way having local x axis going from end 1 to 2 etc Examplet Type NodeID ListType ID s ElmTrans GlobNode 101 Elem 12 Element no 12 will then update it s transformation according to rotations of node 101 If Element 12 is a 2 node non linear spring with zero length less than 1mm the following will be done in addition The initial local global transformation matrix will be set equal to the transformation matrix of the first beam element connected to node 101 This option is typically used in connection with modelling of bearings where the properties should follow the structure s large displacements and rotations 101 102 100 21 22 USFOS 2010 01 01 USFOS USER S MANUAL 6 3 46 Input Description USFOS Control Parameters Example2 Type End ListType ID s ElmTrans LocNode 1 Mat 3 5 8 Means that all spring elements referring to materials 3 5 or 8 will have the local coordinate system defined by the beam element attached to end 1 of the spring in question If the user is planning the model
11. 6 3 1 General 1st line of text identifying the analysis 2nd line of text identifying the analysis 3rd line of text identifying the analysis Character 9 to 80 from each line are stored as text strings This record of three lines is given only once cern inprint outprint termprint Parameter Description Default inprint Code to specify amount input verification print 1 Analysis identification Key parameters and Load control data Structural data Input load data Calculated load data i e gravity Ecco of unprocessed input data Internal FEM parameters outprint Code to specify amount of analysis print out Global history output Results of each load step Control node displacements Status of heavily stressed elements T gt 0 20 Status of heavily stressed elements I gt 0 50 Status of all elements T gt 1 00 All nodal displacements termprint Code to specify output to terminal batch log file 0 Screen output adapted to interactive running 1 Output adapted to batch running The global history output is written to the batch log file This record controls the amount and format of print to terminal and to the Analysis Print File Sect 8 1 The data available for post processing are unaffected by this record This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 7 Input Description USFOS Control Parameters Parameter Description Default n Restart
12. Example 1 QUADSHEL 1234 1234 100 88 100 defines a 4 node shell element with ID 1234 connected to the four nodes with ID 1 2 3 and 4 Material with ID 100 defines the material properties and geometry with ID 88 defines the thickness Node 1 of the shell has an eccentricity defined by Ecc vector with ID 100 The other 3 nodes have no eccentricity This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 13 Input Description UFO Structural file format TRISHELL Elem ID nod1 nod2 nod3 mat geom e1 e2 e3 Parameter Description Elem ID User defined external element number nod1 Node 1 of the shell is connected to the user defined external nod1 nod2 Node 2 of the shell is connected to the user defined external nod2 nod3 Node 3 of the shell is connected to the user defined external nod3 User defined material number defining the material properties of the element User defined geometry number defining the thickness of the element Node 1 of the shell has an eccentricity defined by user defined e1 Node 2 of the shell has an eccentricity defined by user defined e2 Node 3 of the shell has an eccentricity defined by user defined e3 NOTE Zeros at the end of the record may be omitted With this record the user defines a 3 node triangular shell element to be used in the finite element analysis Example 1 TRISHELL 123 102030 100 88 defines a 3 node shell element with ID 123 connected
13. Mat Assign Coeffs to all listed materials Geo _ Assign Coeffs to all listed geometries Group Assign Coeffs to all listed groups ID ID of the actual cross section elements materials etc With this record the user assigns a complete set of Aerodynamic coefficients to a series of element which are specified through their geometry type and or ID Example Coeff ID ListType EDS ss ElmCoeff 10 Pipe Assign to all pipes ElmCoeff 1000 Wing Assign to all Wing sections ElmCoeff 1200 Group 10 20 30 Assign to group 10 20 ind 30 This record could be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 130 Input Description USFOS Control Parameters MaxWind Criterion dT EndT Write Parameter Description Default Criterion Criterion used to identify worst wind state of the actual wind field Baseshear Base Shear is used OverTurn Overturning moment is used dT EndT The wind defined by the WindField record is stepped through with a time increment of dT up to time EndT The worst time detected in the specified interval is used Write option Write The wind forces are written to file noWrite No writing With this record the the user may use USFOS to identify the worst wind state to be used in a static pushover analysis The load_case no of the specified WINDFIELD record may be referred to from the CUSFOS record Example 1 T
14. S MANUAL 6 4 6 Input Description SESAM Structural file format 6 4 3 Cross Sectional Data GBEAMG geono dummy area xix xiy xiz xiyx wpix wpiy wpiz shary sharz scheny schenz Parameter Description Default geono Geometry number referred to in GELREF1 area Cross sectional area xix Torsional moment of inertia about the shear center xiy Moment of inertia about y axis xiz Moment of inertia about z axis xiyZ Product of inertia wpix Plastic torsional section modulus about shear center wpiy Plastic sectional modulus about y axis wpiz Plastic sectional modulus about z axis shary Shear area in direction of y axis sharz Shear area in direction of z axis scheny Location of shear center relative to y axis schenz Location of shear center relative to z axis This record contains the cross sectional parameters for a general cross section GBEAMG input is skipped if GIORH GBOX or GPIPE is given for the same cross section This records consists of four lines USFOS 2010 01 01 USFOS USER S MANUAL 6 4 7 Input Description SESAM Structural file format geono hzi ty bt tt bb tb sfy sfz hzj bfy bfz Parameter Description Default geono Geometry number referred to in GELREF1 Height of beam ty Thickness of beam web Width of top flange Thickness of top flange Width of bottom flange Thickness of bottom flange Shear area factor for y axis direction Shear area sfy shear area calculated by USFOS Shear area f
15. The force component in the beam X axis is used Element end means local shell element node This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 25 Input Description USFOS Control Parameters Dynres G_ Type Parameter Description Default Type Actual Global result type Wint f Internal Energy Wext External Energy Wplast Internal Plastic Energy Wkin Kinetic Energy Wtot Total Energy WaveLoad Total Wave Load Forces WaveOVTM Wave Overturning moment ReacBSH Base Shear Reaction ReacOVTM Reaction Overturning Moment WaveElev Surface Elevation ReacxXDir Reaction force Global X Direction ReacyYDir Reaction force Global Y Direction ReacZDir 3 Reaction force Global Z Direction ReacXMom Reaction Moment about Global X axis ReacYMom Reaction Moment about Global Y axis With this record the user may specify global quantities to be saved every step during a Dynamic Analysis independent on the raf file saving interval Results are stored on a separate file named lt prefix gt dyn and these time histories are accessed from XACT for time history and frequency distribution presentation This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 26 Input Description USFOS Control Parameters 6 3 4 Analysis Control Parameters CPROPAR epssol gamstp ifunc pereul ktrmax dentsw cmax ifysw detersw Parameter Description Default epssol Numerical acc
16. USFOS is currently adapted to the SESAM analysis system and reads structure data and load data generated by the programs PREFRAME WAJAC and WALOCO 3 5 The input records specific for USFOS nonlinear analysis are presented in Section 6 3 Structure input and load input are presented in Section 6 4 6 1 GENERAL INFORMATION The input data are organized in records each record starting with a record identifier of four to eight characters Each record may consist of one or more lines of data terminating on the next record identifier Each line may be up to 132 characters long The data items may be integer on real data The data records may be given in an arbitrary order In this manual each record is presented in a standard frame Each frame represents either one single record or a sequence of similar records USFOS 2010 01 01 USFOS USER S MANUAL 6 2 1 Input Description USFOS Control Parameters RECORD_IDENTIFIER Param_1 Param_2 Param_3 Param_n Parameter Description Default Param_1 Description of 1st parameter Default Param_2 Description of 2nd parameter values Param_3 Description of 3rd parameter if applic Param_n Description of n th parameter able Optional box for comments notes exceptions etc 6 2 FORMATS Nearly all input data are read by SAM FII a FORTRAN free format reader and decoder This means that the data items may be written anywhere on the line as long as the specified order is satisfied The
17. attacking the beam at position x 1 5 m and 90 referring to local beam coordinate system The total Fx force is distributed over an area 0 5 m in X direction and 30 in circumferential direction gas a ro men ara T it EEF fy Le ri i nee ima E a e This record may be repeated JUSFOS 2010 01 01 USFOS USER S MANUAL 6 3 89 Input Description USFOS Control Parameters MESHPIPE nLength nCirc Elem ID Elem ID Elem ID3 Parameter Description Default nLength Number of shell elements in longitudinal direction nCirc Number of shell elements in circumferential direction Elem ID Element ID of beam element s with pipe cross section With this record the user specifies the mesh density of beam element which will be replaced by an automatically generated shell element substructure Note that the nLength nCirc parameters define the quadrilateral mesh and if triangular elements are used two elements are defined per quad as seen in the figure below nCirc 10 Tnangular shell element This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 90 Input Description USFOS Control Parameters MESHBOX nLength nSide nTop nBott Elem ID Elem ID2 Parameter Description Default nLength Number of shell elements in longitudinal direction nSide Number of shell elements on the two profile sides nTop Number of shell elements on top flange nBott Number of shell eleme
18. automatic search procedure this minimum time between peaks is set equal to Tp NOTE This option must be used only in connection with time domain simulations of irregular waves WaveData Spect This record is given once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 121 Input Description USFOS Control Parameters NONHYDRO ListType Ild_List Parameter Description Default ListType Data type used to specify the element s Element The specified Id s are element numbers Ild_List One or several id s separated by space No ID s means all elements With this record the user may define non hydro element elements which are bypassed in all hydrodynamic calculations The elements are specified element list Example 1 NonHydro Elem 1 5 6 Elements 1 5 and 6 are bypassed during the hydrodynamic calculations This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL Input Description USFOS Control Parameters 6 3 122 HYDROPAR Parameter KeyWord Value ListTyp KeyWord Description Value List Type Ild_List Default Keyword defining actual parameter to define KeyWord HyDiam CurrBlock FluiDens MgrThick MgrDens FloodSW DirDepSW FillRatio WaveKRF BuoyLevel Actual Definitions of Value Hydrodynamic Diameter Drag Coefficient Mass Coefficient Lift Coefficient not imp Buoyancy Diameter Internal Diameter Number of integration poin
19. lcomb lfact mxld nstep minstp Cyclic static analysis CICYFOS nloads npostp mxpstp mxpdis lcomb lfact mxld mxdisp nstep minstp lcomb lfact mxld mxdisp nstep minstp lcomb lfact mxld mxdisp nstep minstp Load combination COMBLOAD new_case oldcasel facl oldcase2 fac2 Control displacement CNODES nenods nodex idof dfact nodex idof dfact nodex idof dfact Static analysis time history format STATIC end_time inc dT_res d_Tterm mxdisp nstep minstp Dynamic analysis time history format DYNAMIC end_time deltat dT_res dT_term Time history definition by points TIMEHIST histno Point timel factor time2 factor2 Time history definition by Swith TIMEHIST histno Switch dTime Factor T_start Time history definition by S_Curve TIMEHIST histno S_Curve T1 T2 Factor Power Time history definition by Sine Curve TIMEHIST histno Sine Amp Per Phase tStart nPer Time history definitions by points with const dT TIMEHIST histno ConstInc dTimefacl fac2 fac_n Dynamic analysis load specification LOADHIST l_case time_hist Initialization Time INL TIME T_ini USFOS 2010 01 01 USFOS USER S MANUAL 6 3 2 Input Description USFOS Control Parameters Dynamic Modelling Parameters Page 6 3 18 Structural damping Rayley RAYLDAMP alphal alpha 2 Structural damping time dependent DAMPRATIO Ratiol Ratio2 Freq Freq2 History Damping Parameters General DAMPDATA Dammp_ID Type data Element Damping ELEMDAMP Dammp_ID ListT ype ID list Mass formulation lumped
20. 0 Element 1020 2020 3030 Defines a pressure load case number 4 with intensity 2000 N m7 in local Z direction for all shell elements in the model except for the elements 1020 2020 and 3020 which get an intensity of 1000 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 19 Input Description UFO Structural file format REFINE N_divide Elem1 Elem2 Elem3 Parameter Description N_ divide Each of the specified beam elements should be divided into N_divide elements Elem 1 User defined external element numbers of the elements to be refined NOTE 1 Ifno elements are specified all beam elements are refined as specified 2 Ifan element is defined with initial deformations GIMPER GELIMP the generated nodes between the original beam ends will follow the actual imperfection curve With this record the user specifies elements to be sub divided Example 1 REFINE 4 1020 1030 1040 REFINE 10 1050 defines that elements 1020 1030 and 1040 should be divided into 4 elements and element 1050 into 10 Example 2 REFINE 3 REFINE 8 1050 defines that all beam elements in the model should be divided into 3 elements except element 1050 which should be divided into 8 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 20 Input Description UFO Structural file format UNITVEC Trans ID unix uniy uniz Parameter Description Trans ID Unit vector number
21. 1 DYNAMIC 0 1 means that the dynamic analysis is started with a time increment of 0 001s which is kept until time 0 1s is reached Then the time increment is increased to 0 010s which again is changed to 0 020 at time 1 0 The analysis will terminate at time 10 0s Terminal print is updated each 0 1 th second and results are saved each 0 5 th second In connection with the DYNAMIC option the global step counter is updated each time the results are saved and the limitation of maximum steps ref CMAXSTEP record is affected by the total number of steps saved only In the example the total number of saved steps is 1 2 18 21 default maximum steps to be saved is 512 However total number of internal analysis steps is 100 90 450 640 Reduced saving of results reduces both the disc space requirements and the cpu time l pe End Time 1 End Time 2 End Time 3 Time AT AT AT USFOS 2010 01 01 USFOS USER S MANUAL 6 3 14 Input Description USFOS Control Parameters TIMEHIST histno Points time1 factor1 time2 factor2 Parameter Description histno Time history number user defined ID type Time Hist Type 1 discrete points time1 time Seconds factor1 Scale factor 1 time2 time seconds factor2 Scale factor 2 With this record the user specifies a time history by discrete points Values between the tabulated points are interpolated values outside the specified range are extrapolated as
22. 200 0 001 Max Wave forces found by USFOS The Stoke wave will be stepped through the platform with a time interval of 0 5 s up to time 16s The wave forces at the time phase giving the maximum base shear are assigned to loadcase no 2 override read in node and element loads with this loadcase no LoadCase no 2 is referred to as usual in the CUSFOS record Hint If the automatic member imperfection is activated CINIDEF referring to the WAVADATA loadcase USFOS will use the selected hydrodynamic force pattern when the directions of the individual member imperfections are applied To the left the wave direction is 45 and in the case to the right the wave direction is 180 opposite 225 and the member imperfection is adjusted automatically This record is given only once T lusFos 2010 01 01 USFOS USER S MANUAL 6 3 111 Input Description USFOS Control Parameters MaxWave KeyWord LoadCase s Parameter Description Default KeyWord Keyword defining the actual parameter s WaveLCase Specify Actual Wave Load Case to process If only one WaveData reciord is defined this command could be omitted AddLCase_ Specify addirional loads to be added on top of the wave loads Could be basic read in loadas or wind loads LoadCase Actual Load Case numbers This is an exnetsion of the MaxWave command where the user may specify additional information relevant for the wave load calculation Example 1 Typ
23. 6 rload1 Load in direction of the relevant degree of freedom in the global rload2 coordinate system rload3 rload1 load in x direction rload4 rload2 load in y direction rload5 rload3 load in z direction rload6 rload4 moment about x axis rload5 moment about y axis rload6 moment about z axis This record defines nodal loads from wave load program This record consists of three lines Note The load is handled as conservative loading by USFOS USFOS 2010 01 01 USFOS USER S MANUAL 6 4 20 Input Description SESAM Structural file format BEWALO1 elno 1 rint1 1 rint2 2 Parameter Description Default Load case number Internal element number Number of load points along the element Total element length Distance from local node 1 to load point no 1 Distance from local node 1 to load point no 2 Distance from local node 1 to load point no n Load intensities at load point 1 in global x y and z directions Load intensities at load point 2 in global x y and z directions Load intensities at load point n in global x y and z directions This record defines line loads from wave load program Note The load is handled as conservative loading by USFOS RINT 1 RINT 2 USFOS 2010 01 01 USFOS USER S MANUAL 6 4 21 Input Description SESAM Structural file format BEISTE IIc dummy dummy top elno nnod dummy t1 t2 dummy dummy dummy Parameter Description Default IIc Load case number t
24. Default Zi Z coordinate of the first grid point defining the Integration Point profile Z 0 defines the sea surface and all Z coordinates are given relative to the surface Z axis is pointing upwards Z gt 0 means above the sea surface Block Current Blockage to be used for elements at position Z Zo Z coordinate of the second grid point Block Current Blockage to be used for elements at elevation Z2 This record is used to define a Current Blockage depth profile and is an extended version of the original CurrBlock command previous page Between the tabulated values the Block value is interpolated Values outside the table are extrapolated In the out file the interpolated blockage factor used for each beam element is listed Selected values are also visualized in XACT under Verify Hydrodynamics Data should also be specified above the sea surface Ensure that extrapolation gives correct Block dry elements become wet due to surface wave elevation The command HYDROPAR CurrBlock overrides this command Interpolated value at element s midpoint is used NOTE Sl units must be used N m kg with Z axis pointing upwards This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 117 Input Description USFOS Control Parameters BUOYHIST Hist_Id ListType Id_List Parameter Description Default Hist_ID History ID to be used to scale the current buoyancy forces Type Data type use
25. Field Actual Option Stat The acc field is a static field in a fixed coordinate system Rotating Acceleration field around global X axis Rotating Acceleration field around global Y axis Rotating Acceleration field around global Z axis Coordinate of the Rotation Center specified in Global coordinate system With this record the user defines Rotation Acceleration Field Example lt Center gt LoadCase Type Opt arx arY arZ xX Y Z AccField 1 Rot Stat 1 0 0o 30 0o 30 T a o 9 eats ma Poe defines an acceleration field of magnitude 1 0 rad s about Global X axis The rotation center has coordinates 30 0 30 All data refer to Global coordinate System This record may be repeated lusros 2010 01 01 USFOS USER S MANUAL 6 5 34 Input Description UFO Structural file format 6 5 7 UFO Examples Zayas Frame The plane frame described in the figures below consists of 13 nodes and 23 beam elements A concentrated force is acting at node 10 in positive X direction in addition to the gravity load All nodes are free except the two bottom nodes 120 and 130 The frame consists of pipes and one I H profile The structure is described in UFO format at the next page Le Figure 6 2 Node Numbers Figure 6 3 Element Numbers Flusros 2010 01 01 USFOS USER S MANUAL 6 5 35 Input Description UFO Structural file format UFO input file describing the Zaya s Frame HEAD ZAYAS F
26. ID list or all in once Examples SWITCHES WaveData Timeinc 0 1 Hydrodyn force calc every 0 1sec SWITCHES NodeData DoublyDef ON Accept repeated definition of same node SWITCHES SaturPrint MaxElem 50 Extend list in res_status text This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 100 Input Description USFOS Control Parameters 6 3 16 Hydrodynamics WAVEDATA _case Type Height Period Direct Phase Surflev Depth N_ini Parameter Description Default _case Load case number The wave is activated by using the LOADHIST command referring to this load case number a TIMEHIST of type 3 Type Wave Type 1 Airy Extrapolated 1 1 Airy Stretched 2 Stoke s 5 th Skjelbreia Hendrickson 1961 3 User Defined 4 Stream Function Theory Dean Dalrymple Unit Wave height m Wave period s Direction of wave relative to global x axis counter clockwise dg Wave phase dg Surface Level Z coordinate expressed in global system m Water depth m Number of initialization points defining wave envelope X coordinate of first grid point starting with largest negative x coord Scaling factor of the wave height at first grid point See Figure 6 1 With this record the user may specify a wave to be applied to the structure as hydrodynamic forces The wave is switched ON according to the LOADHIST TIMEHIST definition TIMEHIST type 3 must be used Wave forces are applied on the structural mem
27. Material coeff 1 15 ULS Example 2 Adding value to coordinate y ID X Y Z NODE 10 0 0 10 0 1 23 10 0 Add 1 23 to the Y coordinate Example 3 Create a loadvector IMN depending on angle here 30 degrees lCase NodID Fx Fy Fz NODELOAD 3 10 1 0E6 COS 30 PI 180 1 0E6 SIN 30 PI 180 0 0 E sros 2010 01 01 USFOS USER S MANUAL 6 3 1 Input Description USFOS Control Parameters 6 3 USER INPUT DESCRITION This section describes the input records specific for USFOS nonlinear analysis information MUST be supplied The following e inelastic material properties MISOIEP if the yield stress is not speficied in the structure file e control node s CNODES e loadcontrol CUSFOS static analysis OT CICYFOS cyclic analysis OT DYNAMIC LOADHIST TIMEHIST dynamic analysis Remaining input records are optional In general it is recommended to locate the USFOS control parameters in the control file the head file General Page 6 3 6 Analysis identification HEAD Ist line of text identifying the analysis 2nd line of text identifying the analysis 3rd line of text identifying the analysis Print control CPRINT inprint outprint termprint Data storage CSAVE restart result print Save additional data for XACT presentation XFOSFULL Load control Page 6 3 8 Static analysis CUSFOS nloads npostp mxpstp mxpdis Icomb Ifact mxld nstep minstp lcomb lfact mxld nstep minstp
28. MaxWave WaveLCase 5 The maxwave will be performed using wavedata with load case 5 This means that the input may contain several wavedata definitions Example 2 Typ lCase MaxWave WaveLCase 5 MaxWave AddLCase 10 The maxwave will be performed using wavedata with load case 5 However when the total load vector is computed the forces from load case 10 will be added on top of the wave forces For example could load case 10 contain slamming loads wave in deck with time history information specified The time when the sum of all loads gives the max peak base shear or overturn will then be selected NOTE In the CUSFOS input it should be referred to the Wave load case in this example Ic 5 The additional load case could be either ordinary read in loads concentrated or distributed together with time variation information TimeHist LoadHist or it could be Wind Loads computed internally by USFos This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 112 Input Description USFOS Control Parameters WavMxScl Scale Parameter Description Default Scale Scaling factor used to scale the computed wave_loads from MaxWave 1 0 option before assiging into the actual loadvector This record is used to scale the wave forces calculated by USFOS under the MaxWave option The scaled forces are copied into the actual load vector before the analysis starts This option is required when the force unit used i
29. One or several id s separated by space With this record the user may define special buoyancy formulation on selected elements The elements are specified either directly element list or in directly using material geometry or group references The Panel model is rather time consuming and it is recommended to us this formulation on special selected elements only buoyancy tanks etc Instantaneous dynamic static pressure on cylindrical and conical sides and on the the bottom are computed and integrated Example 1 BuoyForm Panel Mat 1 5 6 All elements referring to materials 1 5 or 6 will have the buoyancy computed according to panel formulation All other elements are using the simple default arhimedes formula buoyancy weight of submerged water NOTE The last definitions will override previous definitions if same element is defined more than once This record may be repeated TF lusros 2010 01 01 USFOS USER S MANUAL 6 3 119 Input Description USFOS Control Parameters INTFLUID Density FillTyp ListType Id_List Parameter Description Default Density Density of the internalt fluid kg m FillTyp Filling Type TimeDep The internal fluid level fillratio is defined by a timehistory Computed The internal fluid level is computed Not Implemented ListType Data type used to specify the elements Element The specified Id s are element numbers Geo f The specified Id s are geometry
30. Response Analysis c ccccceesceceeeceeseeceeaceceeeeeesaeceeaeceeaeeenaees 6 3 71 6 3 12 gt Ship Impact analysis nirearen n ETE EE hadi ERE E skis 6 3 79 6 3 13 External pressure Effects enserre enerne denten eaer e E ATT E Eo 6 3 84 6 3 14 Super element Sub structure Modelling eseeeeeeeeeeeeeseeessseesererssresresreeresressesreess 6 3 86 6 32 15 Misc llanegUS aenn E E E EEE TEE e AEAEE TOA 6 3 92 6 33 16 Hydrodynamics iei EA el lath se 6 3 100 6 317 _ AGSLODYMAMICS 5555 6dcix s Sees sabe estes cacti Ssnahdgantcedoues seen cgvecnaagieass a etase aiai 6 3 124 63218 HarthquaKk ees socescecs csscesioeesck pans cascBazes vescuvsepecausaes Raseveasatercadiatecennieiede chaenebertioneeetiae 6 3 131 6 4 Sesam structuial File Format auseron openee aE en a ETE E E ives 6 4 1 6 4 1 Geometry Datar vs sescebsatavestousdscaelat EE Ea EE EEEE e EE AE A E Eia 6 4 3 6 4 2 Connectivity D tassnunecneinnna iira e a a debs a coke R A 6 4 4 6 4 3 Cross Sectional Dataeorsrei oeri itn a a aa E a E E EE e TAE E 6 4 6 6 4 4 Element D ta reai eri petae aaee nh aac Sena eer 6 4 11 6 4 5 Material Datazioa ndane E a E ies dace bas wate Oi laa heii cadeuvsineds 6 4 12 6 4 6 Boundary Conditrons hienen aroen e aee en aa ae 6 4 14 6 4 7 Load and Temperature Increments eecceeecceesseceeececeeeeeeeeeceeaeeceeeeecsaeeneaeceeaeeees 6 4 17 6 4 8 Hydrodynamic Added Mass ccsssssscsseceseceseceseeeseeeeceseaeesseesseecaaecaecsaeceaeeesee
31. WavelrInt overrides this command Interpolated value at element s midpoint is used NOTE Sl units must be used N m kg with Z axis pointing upwards This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 115 Input Description USFOS Control Parameters CurrBloc Type Data Parameter Description Default Type Current Blocakge Type currently only User is available Data Required data for the different options Type User Data is just a scaling factor Fac Type API Taylor Blockage for the different members are computed according to API Taylors formulas Two different options exist a Common Averaged factor are used for all elements Q Individual Specific blockage for the different elements The user may use this record to specify the reduction factor to be used in connection with calculation of current forces Velcon Vel Fac Example 1 CurrBlock User 0 85 All elements get a blockage factor of 0 85 Example 2 CurrBlock API Taylor Common All elements get the computed averaged factor according to API Tylor Example 3 CurrBlock API Taylor Individual Computed factors will be assigned to the individual elements according to API Tylor This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 116 Input Description USFOS Control Parameters CurrBlock Profile Zi Block 2 Block Zn Block Parameter Description
32. beam elements 2 points are used default Example 2 Wave_Int 3 Wave_Int 10 101 102 Means that default number of integration sections points are changed from 2 to 3 However for elements 101 and 102 10 points are used This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 114 Input Description USFOS Control Parameters Wave_Int Profile Zi nint Z2 nl nto Li ninta Parameter Description Default Z coordinate of the first grid point defining the Integration Point profile Z 0 defines the sea surface and all Z coordinates are given relative to the surface Z axis is pointing upwards Z gt 0 means above the sea surface Number of Integration Points to be used for elements at position Z4 Z coordinate of the second grid point Number of Integration Points to be used for elements at elevation Z2 This record is used to define a Integration Point depth profile and is an extended version of the original Wave_Int command described on previsous page Between the tabulated values the nint is interpolated Values outside the table are extrapolated In the out file the interpolated number of integration points used for each beam element is listed Selected values are also visualized in XACT under Verify Hydrodynamics Data should also be specified above the sea surface Ensure that extrapolation gives correct nint dry elements become wet due to surface wave elevation The command HYDROPAR
33. contains the eccentricity vector of each nodal eccentricity The eccentricity vector is given in global coordinates and points from the global node towards the local element node cfr Figure 3 3 This record consists of one line GUNIVEC transno unix uniy uniz Parameter Description Default transno Unit vector number referred to in record GELREF1 unix Unit in global coordinates The vector specifies the direction along local uniy element z axis uniz This record consists of one line USFOS 2010 01 01 USFOS USER S MANUAL 6 4 12 Input Description SESAM Structural file format 6 4 5 Material Data MGSPRNG matno ndof k Koy k31 k41 Ks Ker k22 k32 Kao Kso Keo k33 k43 Ks3 Kes Kaa Ksa Kea Kss Kes Kee Parameter Description Default matno Material number ndof Number of nodal degrees of freedom ndof 6 Elements of the spring stiffness matrix k pk4 k21K22 k31k32 k33 Kaika2 k43 Ksiks2 Ks3 L kgikee Ke3 This record defines the stiffness characteristics of linear springs to ground Only the elements below the main diagonal are given i e a symmetric stiffness matrix is assumed The elements are referred to the global coordinate system or to a local nodal coordinate system if one is defined by record BNTRCOS and referenced by record GELREF1 USFOS 2010 01 01 USFOS USER S MANUAL 6 4 13 Input Description SESAM Structural file format MISOPL Parameter matno matyp dummy matno m
34. data is stored every n th load step of each load 0 case combination m Result data is stored every m th load step of each load 10 case combination k Result data is printed at the out file every k th step of each load 1 case combination This record is used to specify storage of restart and result data If this record is skipped restart result data are stored for every step Ifn 0 then no restart data will be stored Ifn i then restart data will be stored every i th step plus at the end of each load specification CUSFOS CICYFOS line If m 0 then no result data will be stored If m j then result data will be stored every j th step plus at the end of each load specification CUSFOS CICYFOS line Ifk 0 then no result data will be printed at the out file Ifk k then result data will be printed every k th step plus at the end of each load specification CUSFOS CICYFOS line NOTE In connection with dynamic analysis the parameters n m and k are 0 1 switches The time increment between result saving is controlled on the DYNAMIC record By default the switches are setto O 1 1 This record is given only once XFOSFULL Parameter Description Default If this record is specified no parameters all available data are stored on the raf file for inspection by XACT By default to save disc space some result types are not stored With this record the user may specify that all available result data should be stored on the r
35. data items must be separated with at least one blank exceeding blanks are ignored Note that blank is exclusively interpreted as a delimiter and can not be used to specify a zero value as accepted by standard FORTRAN READ Important All digits letters and or special symbols in a data item must be given consecutively without blanks 6 2 1 Comments Lines with following characters in the first column are interpreted as comments and are simply ignored Comments may occur anywhere in the input data stream 1 x Example THIS IS A COMMENT NOTE COMMENTS ARE IGNORED BY THE PROGRAM USFOS 2010 01 01 USFOS USER S MANUAL 6 2 2 Input Description USFOS Control Parameters In Line Comments The character may be used to terminate a data line and data items on the rest of the line are just ignored Example Mat_ID E mod poiss F_yield Density therm exp MISOIEP 1 2 10E 5 0 3 355 8235 7 0 0 MISOIEP 2 2 10E 5 0 3 340 8235 7 0 0 NEW 96 02 13 MISOIEP 2 2 10E 5 0 3 300 8235 7 0 0 OLD 96 02 13 This is a useful option in connection with modification correction of input files Alphanumeric Data Items An alphanumeric data item may consist of one or more characters The first character is always a letter A Z while the remaining ones may be letters digits or special symbols except amp and blank There is no upper limit to the number of characters in an alphanumeric data item However onl
36. development at second node ihinmid Restriction code for plastic hinge development at midspan elnox1 External user specified element number 1 elnox2 External user specified element number 2 NOTE If no elements are specified all beam elements get the actual restriction code This record may be used to suppress development of plastic hinges on specified elements This record may be repeated Example PLASTHIN PLASTHIN 00 00 1 0 1010 1020 1030 Will suppress plastic hinge at midspan for all elements except for elements 1010 1020 and 1030 This record is an alternative to the CELHINX record USFOS 2010 01 01 USFOS USER S MANUAL 6 3 38 Input Description USFOS Control Parameters BEAMHING ix1 iy1 iz1 irx1 iry1 irz1 ix2 iy2 iz2 irx2 iry2 irz2 elnox1 elnox2 elnoxn Parameter Description Default ix1 Fixation Code for Local X Direction of node 1 of element 0 Fully Released 1 Fully Connected Fixation Code for Local Y Direction of node 1 of element iy1 Fixation Code for Local Z Direction of node 1 of element iz1 Fixation Code for Torsion Moment of node 1 of element irx1 Fixation Code for Moment about Local Y axis of node 1 of element iry1 Fixation Code for Moment about Local Z axis of node 1 of element irz1 Fixation Code for Local X Direction of node 2 of element ix2 etc elnox1 External element number 1 to be defined with the actual internal hinge elnox2 External element number 2 to be defined with t
37. file NOTE Sl units must be used N m kg with Z axis pointing upwards This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL Input Description USFOS Control Parameters 6 3 125 USFOS NEW input syntax WindField LCase GWF_Type Ux Uy Uz Zo Zso Rho Power Unit LCase Load Case ID for this wind definition GWF_Type Global Wind Field Type Uniform Uniform wind in the entire space Z_ Profile The Wind speed increases for increasing Z 3D_Tab1 The Global Wind is specified in Tables Type 1 3D_Tab2 The Global Wind is specified in Tables Type 2 Ux Uz X Y and Z component of the Global wind Referred to Global Coords m s The wind vector definition depend on Wind Field Type Uniform The uniform wind Vector Z_ Profile Wind Vector at elevation Z2 10m above surface 3D_Tab1 Dummy 3D_Tab2 Dummy Zo Z coordinate of the Wind Coord System Origo Specified in Glob Coord m Zgott Skip wind calculation for elements below Zgort Specified in Local Wind Coordinates Default is 0 0 Rho Density of Air If Omitted p 1 293 is used kg m P y POWER Bower Power Law for Z varying wind U z U o 2 Where U10 is the Ux Uy and Uz specified at 10 m above ground With this record the user defines the Global wind Field to be used in the simulations Examples LCase Type Ux Uy Uz Z0 Zbott R
38. fully released trano trano 0 is mandatory The fixation is then defined in local element coordinate system fix1 Fixation Code of local X direction 0 Fully Released 1 Fully Fixed fix2 Fixation Code of local Y direction 0 Fully Released 1 Fully Fixed This record specified internal hinge definition to be referred to from the GELREF 1 record This record consists of three lines USFOS 2010 01 01 USFOS USER S MANUAL 6 4 17 Input Description SESAM Structural file format 6 4 7 Load and Temperature Increments The BNLOAD record defines nodal loads The BELOADI record defines element line loads The BRAV record defines gravitational loads BNLOAD IIc dummy dummy dummy nodeno ndof rload1 rload2 rload3 rload4 rload5 rload6 Parameter Description Default IIc Load case number nodeno Internal node number ndof Number of degrees of freedom ndof 6 rload1 Load in direction of the relevant degree of freedom in the global rload2 coordinate system rload3 rload1 load in x direction rload4 rload2 load in y direction rload5 rload3 load in z direction rload6 rload4 moment about x axis rload5 moment about y axis rload6 moment about z axis This record defines nodal loads This record consists of three lines Note The load is handled as conservative loading by USFOS USFOS 2010 01 01 USFOS USER S MANUAL 6 4 18 Input Description SESAM Structural file format BELOAD1 lic elno dummy
39. get the specified temperature data This record contains specification of detailed temperature increments generated by FAHTS This record may be repeated The definition of the Data_Set is as follows Type 1 Data_Set consists of 3 values t_mean t_grad_Y and t_grad_Z Type 2 Data_Set consists of an arbitrary number of values n x1y1z1t1 x2y2z2t2 xn yn zn tn where nis number of points with temperature data x y z are coordinates to the actual point local cross sect coords tis actual temperature increment USFOS 2010 01 01 USFOS USER S MANUAL 6 3 73 Input Description USFOS Control Parameters CTFRACT If CTFRACT is specified all beam elements are checked for fracture due to elevated temperature in the material If CTFRACT is not specified no temperature fracture checking will be performed Note The TFRACT record do not activate fracture checking This record is given once TFRACT matno T fract Sy fract E fract Parameter Description Default matno Material number T fract Critical element temperature at reference axis for element fracture Sy fract Yield stress degradation factor for element fracture Defined by the ratio Yield stress at temperature T to the yield stress at 0 C E fract Elastic modulus degradation factor for element fracture Defined by the ratio Elastic modulus at temperature T to the elastic modulus at 0 C This record specifies additional information to the MISOIEP record
40. indicated in the figure below This record may be repeated interpolated extrapolated c 3 gt a 2 O g D oO Y Scaling factor USFOS 2010 01 01 USFOS USER S MANUAL 6 3 15 Input Description USFOS Control Parameters TIMEHIST histno Switch dTime factor Tstart Parameter Description histno Time history number user defined ID type Time Hist Type 3 switch dTime Time between calculation of forces see WAVEDATA dTime 0 means that loads are calculated every analysis time step factor Forces calculated from wave current wind are multiplied with this factor default 1 0 Tstart Time for switching ON the actual environmental load default Tstart 0 With this record the user specifies a time history used to control the time for applying the wave current wing loads The time between recalclation of the forces is controlled in this command as well as force scaling factors This record may be repeated TIMEHIST histno S_Curve T1 T2 factor power Parameter Description histno Time history number user defined ID Time Hist Type 4 s_Curve type T1 Time for activation this history Curve value Zero for time lt T1 T2 Time for full value Curve value Factor for time gt T2 factor Actual curve value for time gt T2 power power 1 Linear curve straight line from T1 to T2 power 2 Second order s shaped curve from T1 to T2 power 3 3 order s shaped curve
41. iz Ref 1 Only valid for iy and iz Same as i 1 but not including torsional effects This record is used to define dependent degrees of freedom Sect 3 8 The record is given once for every node with dependent degrees of freedom USFOS 2010 01 01 USFOS USER S MANUAL 6 3 41 Input Description USFOS Control Parameters NONSTRU ListType List Parameter Description Default ListType Definition Type Element Element ID list Material Material ID list Geometry Geometry ID list Group Group ID list Visible The nonstructural elements are visualized in Xact default invisible List of actual ID s This record is used to specify non structural beam elements passive elements and such elements are excluded from the global stiffness formulation while the elements attracted loads are kept Example 1 NonStru Element 1001 1002 2001 2002 NonStru Geom 27304 27305 27306 All beam elements referring to one of the cross section geometry ID s 27304 27305 or 27306 will become non structural In addition the elements 1001 1002 2001 and 2002 get nonstru Example 2 NonStru Mat 210355 210345 All beam elements referring to one of the material ID s 210355 or 210345 will become non structural Example 3 NonStru Group 1111 2222 3333 All beam elements member of one of the Group ID s 1111 2222 or 3333 will become non structural Example 4 NonStru Visible This command switches ON
42. may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 24 Input Description USFOS Control Parameters Dynres_E Type Elem_ID End Dof opt Parameter Description Default Type Actual Element result type Disp Element Displacement Force Element Force Elem_ID Actual Element ID of which dynamic results should be saved End Element end Dof Actuall local element degree of freedom 1 X displacement Axial force 2 Y displacement Shear force y direction If the element is a shell element see description below If the element is a Shell Element the forces could be projected into the local coordinate system of a beam element Opt is then the beam element ID With this record the the user may specify element quantities to be saved every step during a Dynamic Analysis independent on the raf file saving interval Results are stored on a separate file named lt prefix gt dyn and these time histories are accessed from XACT Dynres forces for Beam Elements always refer to local beam coordinate system Dynres forces for Shell Elements could be referred as follows e Forces are referring to Global Coord system default e Forces are referring to the Local Beam axix of a reference Beam Element When forces are referring to a Beam the specified DOF referres to The Beam s Local coordinate system Example i Typ lem nd Dof BeamID DynRes_ Elem Force 100 3 1 1 Shell Force Projected on Beam
43. on this record including this matrref Reference number for this stiffness matrix record snodi Supernode sequence number of super element or internal node number snodj of basic element coodof Coded form of submatrix dimension 1000 idof jdof 6006 Submatrix stiffness terms This record contains stiffness terms for a nodal submatrix of an element stiffness matrix It may be reduced super element or basic element stiffness matrix Each record contains the stiffness terms connecting one node snodi to another snodj or itself The matrices are stored as sparse block data which means that submatrices with all terms equal to zero are not stored The stiffnesses are referred to the global coordinate system or to a local system if one is defined by record BNTRCOS and refereed to in the GELREF 1 record USFOS 2010 01 01 USFOS USER S MANUAL 6 5 1 Input Description UFO Structural file format 6 5 UFO STRUCTURAL FILE FORMAT UFO is special designed for being an efficient User friendly structural file FOrmat in connection with modelling of framed structures The user may give all input on one file or distribute the data on several files All control parameters are specified in the Analysis Control File Structure data can also be read from this file but is usually given on one separate file The specific content of these files is not important as long as all data are present UFO do not use any internal numbers all data are re
44. particle velocity is calculated as follows Velcon Velop KRF This record is given only once Wave_KRF Profile Z KRF Zn Parameter Description Default Z coordinate of the first grid point defining the Integration Point profile Z 0 defines the sea surface and all Z coordinates are given relative to the surface Z axis is pointing upwards Z gt 0 means above the sea surface Kinematics Reduction Factor to be used for elements at position Z4 Z coordinate of the second grid point Kinematics Reduction Factor to be used for elements at elevation Z gt This record is used to define a Kinematics Reduction Factor depth profile and is an extended version of the original Wave_KRF command Between the tabulated values the KRF is interpolated Values outside the table are extrapolated In the out file the interpolated wave kinematics reduction factor used for each beam element is listed Selected values are also visualized in XACT under Verify Hydrodynamics Data should also be specified above the sea surface Ensure that extrapolation gives correct KRF dry elements become wet due to surface wave elevation The command HYDROPAR WaveKRF overrides this command Interpolated value at element s midpoint is used NOTE Sl units must be used N m kg with Z axis pointing upwards This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 109 Input Description USFOS Control Parameters BUOYA
45. pile tip Soil characteristics are defined by SOILCHAR record with this ID Pile Material Properties are defined by the referred MISOIEP record Pile Geometry is defined by the PILEGEO record with this ID Local Coordinate System for the pile is defined by the referred unit 0 vector If omitted or equal to zero default local coord system is used Pile Imperfection reference to GIMPER record 0 This record is used to define a pile element This record may be repeated In XACT the pile is visualized with discs representing the soil defined in the referred SOILCHAR record The relative size of the discs reflect the relative strength of the soil weighting the T Z capacity with a factor 100 and the P Y capacity with 1 Max disc diameter is 10 times max pile diameter Minimum disc diameter is 2 times pile diameter By pointing on any soil disc using the option verify element information The peak soil capacities are printed Relative movement of the pile and the surrounding soil is visualized as well as the utilization of the soil The soil displacements are easier to observe with the mesh applied T lusros 2010 01 01 USFOS USER S MANUAL 6 3 62 Input Description USFOS Control Parameters PILEGEO ID Type Do T Parameter Description Default ID User defined number used to identify the Pile Geometry referred to on the PILE record Type Pile Type Pile type 1 means a single Pipe with specified outer
46. ref USFOS Theory Manual Sect 14 PCOR_ON Parameter Description Default Predictor Corrector approach used in the numerical integration of the equation of motion The solution of the equation of motion at a typical time step is then performed as a two step procedure 1 Predict increments in velocity and acceleration 2 Perform corrector steps One or several corrector steps may be specified on the CITER record This record may be used to activate the Predictor Corrector approach in the numerical time integration of the equation of motion Note This record may only be used in combination with the CITER record PCOR_OFF Parameter Description Default Predictor Corrector approach NOT used when solving the equation of motion by means of numerical integration USFOS 2010 01 01 USFOS USER S MANUAL 6 3 32 Input Description USFOS Control Parameters 6 3 6 Material Plasticity Modelling MISOIEP matno E mod poiss yield density term exp c1 al c2 a2 c3 a3 c4 a4 c5 a5 c6 a6 Parameter Description Default matno Material reference number E mod Elastic modulus poiss Poisson s ratio yield Yield strength density Mass density term exp Thermal expansion ratio c1 Hardening parameter for x force al Elasto plastic growth parameter for x force c2 Hardening parameter for y force a2 Elasto plastic growth parameter for y force Ditto for z force x moment y moment z moment This record is used to specify material properties whe
47. riser beam type 1 ListType Definition Type Element Element ID list Material Material ID list Geometry Geometry ID list All All elements become elastic no further input List of actual ID s This record is used to specify elements which should be linear and the command is an alternative to the more detailed PLASTHIN command Development of plastic hinges is suppressed in all 3 nodes Example 1 Lin_Elem 0 Geom 27304 27305 27306 Lin_ Elem 0 Element 1001 1002 All beam elements referring to one of the cross section geometry ID s 27304 27305 or 27306 will become elastic yielding in all 3 hinges are suppressed in addition the elements 1001 and 1002 Example 2 Lin_Elem 1 Mat 210355 210345 All beam elements referring to one of the material ID s 210355 or 210345 will become elastic The beam formulation is the integration point based riser element which also suppresses elastic buckling if one element per member is used This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 43 Input Description USFOS Control Parameters CINIDEF Size ColumnCurve Pattern LoadCase Parameter Description Default Size Magnitude of initial imperfection or column curve number Size lt 0 1 f e L given directly Size gt 1 Column curve number 0 Use program default 1 1 Direction following member line load Direction following global base shear LoadCase Load case to determine directio
48. the visualization of the non structural members By default only structural members are visulaized in Xact All parameters may be abbreviated but enough characters to ensure non ambiguous definition is required Geometry could be specified as Ge Geo Geom etc material as M Ma Mat etc NOTE The command STRUCTEL structural elements will override the NonStru definitions This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 42 Input Description USFOS Control Parameters STRUCTEL ListType List Parameter Description Default ListType Definition Type Element Element ID list Material Material ID list Geometry Geometry ID list Group Group ID list List of actual ID s This record is used to override non structural beam element s specified under NONSTRU This option is useful in connection with models where for example most elements with given geometry ID s should become non structural except some few which should become structural Example 1 NonStru Geom 27304 27305 27306 StructEl Element 1001 1002 All beam elements referring to one of the cross section geometry ID s 27304 27305 or 27306 will become non structural However the elements 1001 and 1002 which refer to one of the specified geometry ID s should remain structural This record may be repeated LIN ELEM Type ListType List Parameter Description Default Type For conventional beam type 0 for
49. to be used in the finite element analysis Example 1 MEMBRANE 1234 1234 100 88 defines a 4 node membrane element with ID 1234 connected to the four nodes with ID 1 2 3 and 4 Material with ID 100 defines the material properties and geometry with ID 88 defines the thickness No eccentricities This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 12 Input Description UFO Structural file format QUADSHEL ElemID_ nodi nod2 nod3 nod4 mat geom e1 e2 e3 e4 Parameter Description Elem ID User defined external element number nod1 Node 1 of the shell is connected to the user defined external nod1 nod2 Node 2 of the shell is connected to the user defined external nod2 nod3 Node 3 of the shell is connected to the user defined external nod3 nod4 Node 4 of the shell is connected to the user defined external nod4 User defined material number defining the material properties of the element User defined geometry number defining the thickness of the element Node 1 of the shell has an eccentricity defined by user defined e1 Node 2 of the shell has an eccentricity defined by user defined e2 Node 3 of the shell has an eccentricity defined by user defined e3 Node 4 of the shell has an eccentricity defined by user defined e4 NOTE Zeros at the end of the record may be omitted With this record the user defines a 4 node quadrilateral shell element to be used in the finite element analysis
50. 0 0 4 0 define both a node with ID 10200 Coordinates 1 0 0 0 4 0 with all degrees of freedom free Example 2 NODE 10300 1 300 0133 0 110000 NODE 10300 1 30 0 0 133 0 11 define both a node with ID 10300 Coordinates 1 3 0 0 133 0 with x and y degrees of freedom fixed the rest are free This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 5 Input Description UFO Structural file format NODELOAD Load Case Node ID fx fy fz mx my mz Parameter Description Load Case Load Case Number Node ID User defined external node number fx fy fz Concentrated force in X Y and Z direction mx my mz Concentrated bending moment about X Y and Z axis NOTE Zeros at the end of the record may be omitted and will be treated as zero load With this record the user defines a concentrated load Example 1 NODELOAD 3 10200 1000 0 NODELOAD 3 10200 1000 0 0 0 0 0 0 0 0 00 0 define both a force in X direction acting at node 10200 with load case number 3 Example 2 NODELOAD 4 10500 0 0 0 0 1000 0 NODELOAD 4 10500 0 0 0 0 1000 0 0 0 0 00 0 define both a force in Z direction acting at node 10500 with load case number 4 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 6 Input Description UFO Structural file format NODEMASS NodeID Mx My Mz M_Rx M_Ry M_Rz Parameter Description Node ID User defined external node number fx fy fz Concentrated Mass in
51. 01 USFOS USER S MANUAL 6 5 17 Input Description UFO Structural file format SHELLOAD Load Case qx qy qz lt List Type gt Data Parameter Description Load Case Load Case Number qx qy qz Intensity in X Y and Z direction Global direction lt List Type gt Definition of the ID list next parameter s two different list types are available Element The actual shell load is assigned to the elements given under Data Material The actual shell load is assigned to shell elements with material ID s given in Data List of Element ID s if type element or Material ID s if type material NOTE No ID s specified has same meaning as specifying all actual ID s With this record the user defines a distributed conservative shell element load referred to Global coordinate system Example 1 SHELLOAD 5 0 0 0 0 1000 0 Element 1020 2020 3030 Defines a uniform distributed load load case number 5 with intensity 1000 N m7 in global Z direction for elements 1020 2020 and 3020 Example 2 SHELLOAD 3 0 0 0 0 2200 0 Material 245 355 Defines a uniform distributed load load case number 3 with intensity 2200 N m in global Z direction for all shell elements referred to material ID s 245 or 355 Example 3 SHELLOAD 4 0 0 0 0 2000 0 Element SHELLOAD 4 0 0 0 0 1000 0 Element 1020 2020 3030 Defines a uniform distributed load load case number 4 with intensity 2000 N m in global Z direction for a
52. 07 UNITVEC 2 707 000 707 UNITVEC 3 000 000 1 000 UNITVEC 4 000 1 000 000 1 Be et O ERA ate Nn IA ESE a tO tr ee Ly AEE AIEE nd es LOAD Uo tedouweiseue sbateod ceeackicesloddes state ENSEN A E EE EEA E lee eee 1 t Load Case Node ID Fx Fy Fz NODELOAD 1 10 4 00E 04 0 0 1 i Load Case Acc X Acc _Y Acc _ Z GRAVITY 5 0 0 9 81 JUSFOS 2010 01 01 USFOS USER S MANUAL 6 5 1 Input Description UFO Structural file format USFOS 2010 01 01
53. 1 USFOS USER S MANUAL 6 3 5 Input Description USFOS Control Parameters Hydrodynamics Page 6 3 100 Wave Definition WAVEDATA lcase type height period dir phase surflev depth n X1 fl Xn fn Current depth profile CURRENT l case speed dir surflev depth Z1 fl Zn fn Current time dependency CURRHIST Time_1 fl Time_n fn Account for relative velocity REL_VELO nAvrg Print of waveloads WAVCASE1 l_casel iTotal Marine Growth profile M_GROWTH Z1 Add T1 Z2 Add T2 ua Defintion of Cd and Cm element by elem HYD_CdCm Cd Cm Elm_1 Elm 2 cee Defining Cd by depth profile HYDRO_Cd Z1 Cd1 Z2 Cd2 ana Defining Cm by depth profile HYDRO_Cm Z1 Cmi Z2 Cm2 n Wave Kinematics Reduction Factor Wave _KRF Factor Wave _KRF Factor ListType ID s Wave _KRF Factor Profile Buoyancy Switch BUOYANCY l_case Write Flooded Members FLOODED Elm_1 Elm_2 Elm_3 FLOODED ListType ID s Wave load preprocessing MAXWAVE Criterion dT EndT Write MAXWAVE Keyword LoadCase s Wavel load scaling due to units WAVMXSCL Scale Switch ON hydro checking for all elem WET_ELEM All Wave load integration points WAVE_INT NIS Elem_1 Elem_2 Elem_3 WAVE_INT NIS ListType ID s WAVE_INT NIS Profile Current Blockage Factor CURRBLOC Type Data CURRBLOC Profile Buoyancy History BUOYHIST HistID ListType IDlist Buoyancy Formulation BUOYFORM Form ListType IDlist Internal Fluid Free Surface Calculation INTFLUID Density FillTyp HistID ListType IDlist Spool
54. 2 End 2 undeformed _ angle Orientation of offset and dent Specified in degrees counter clockwise from the local element z axis z Ww x Zz M K vw gt M A Section M M offset Maximum offset divided by element length dent1 Depth of dent divided by pipe diameter First node dent2 Depth of dent divided by pipe diameter Second node dentmid Depth of dent divided by pipe diameter Element midspan This record is used to define initial deformations and damage conditions for tubes Sect 3 4 Note The effect of local dents is only included if the dent switch parameter dentsw 1 default Sect 6 3 C This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 40 Input Description USFOS Control Parameters GELIMP elnox impgroup Parameter Description Default elnox External user defined element number impgroup Reference number of imperfection group This record is used to assign initial deformations or damage conditions to specified elements This record may be repeated BLINDP2 insl Parameter Description Default insl Slave dependent node Element with master independent node s The coupled degrees of freedom DOFs are referred to this local element coordinate system Specification of linear dependent DOFs in local master element coordinate system i 0 No coupling i 1 The slave DOF is linearly dependent on the corresponding master DOF s including torsional effects for iy and
55. AL 6 3 57 Input Description USFOS Control Parameters CNOHINX nodex hinmx Parameter Description Default nodex External user specified node number hinmx Max number of plastic hinges to develop at this node This record may be used to control the number of plastic hinges to be developed at specified nodes Sect 4 5 Number of plastic hinges can only be modified by the user when an elastic perfectly plastic model is selected i e ifysw 1 and C 0 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 58 Input Description USFOS Control Parameters 6 3 9 Foundation Modelling SPUDMAT matno Type Vpre R tot 8 c y C8 C1 C7 Parameter Description Default matno Material number Type Soil Type Sand Vore Vertical preload R_ Tot Total Spudcan Radius B Apex angle deg Gy Shear module vertical Gu Shear module horizontal Gr Shear module rotational v Poisson number soil Q Friction angle soil deg C Cohesion soil yY Effective unit weight soil Degree of associated flow 1 0 Cs 1 0 Associated flow 2 0 Non uplift sliding Ci Inner yield surface parameter 0 3 C7 Yield surface Transition parameter 1 4 This record is used to specify material properties for the nonlinear jackup foundation element 1 noded element This material model is based on SNAME Recommended Practice If the apex angle is 90 degrees the preload is a dummy variable if the apex angle is le
56. Elem_1 Elem_2 Parameter Description Default Case Actual load case number Elem_1 Element 1 having a co rotated load applied Elem_2 Element 2 having a co rotated load applied With this record the user may specify load cases and elements for which the distributed load should be treated as co rotated loads defined in the local beam co ordinate systems NOTE The distributed loads are defined in the local element co ordinate system for the beams load cases defined A z component will f ex be applied in the beam local z axis This record may be repeated Type nMst nSlv Mst mst2 mstims Slv1 slv2 SlVnsiv Parameter Description Default Type Sliding Interface Type MatBeam Beam Beam contact specified through material ID s nMst Number of master surfaces nslv Number of slave surfaces Mst Mst Master Surface material ID s Slv Slv Slave Surface material ID s With this record the user may specify activation of the contact search procedure which automatically detects contact between structural members This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 94 Input Description USFOS Control Parameters Invisible Type Id_ Parameter Description Default Type Data type used to specify invisible elements Material The specified Id s are material numbers All non linear spring elements referred to these materials are not visualized in Xact Nonlinear spring Material number
57. FOS USER S MANUAL 6 3 135 Input Description USFOS Control Parameters SOILDISP case Type data dof_code Values Parameter Description Default case Load Case number for the prescribed displacement which is referred to on the LOADHIST record Type Definition type Type 1 The soil is identified by Z_top Z_bott Type 2 The Soil is identified by the Pile ID Depends on Type 1 or Type 2 For Type 1 Data Z_ Top Z_Bott Soil Coordinate System For Type 2 Data Pile ID dof_code Integer number defining the prescribed degrees of freedom The dof s are specified from 1 through 6 in global coordinates 1 Displacement in global X direction 2 Displacement in global Y direction 3 Displacement in global Z direction Values Reference values for the prescribed displacements 0 0 zero defined fixed dof NOTE Values should only be specified for the dof s defined in the dof_code This record defines prescribed displacements in the soil The dof_code is formed by the dof numbers for all prescribed degrees of freedom at the soil node s written consecutively without blanks Example 1 LC Type z_ Top z_Bott DOF Vall Val2 SOILDISP 3 1 0 0 20 0 12 SOILDISP 3 1 20 0 50 0 SOILDISP 3 1 50 0 100 0 Example 2 LC Type Pile ID DOF Vall Val2 SOILDISP 3 2 1001 12 1 0 0 5 Subsidence of pile See also examples on www USFOS com and release notes for USFOS version 8 5 Note that the values are reference values
58. LUMPMASS rotmas Mass formulation consistent CONSIMAS System Damping Formulation Switch SYSDAMP Switch Initial velocity INL VELO Type Time Vx Vy Vz rVx rVy rVz Id_1 Id_2 Dynamic result Nodal data DYNRES_N Type Node_ID Dof Node_2 Dof_2 Dynamic result Element data DYNRES_E Type Elem_ID End Dof opt Dynamic result Global data DYNRES_G Type Analysis Control Parameters Page 6 3 26 Program parameters CPROPAR epssol gamstp ifunc pereul ktrmax dentsw cmax ifysw detersw Switch off 2 Surface model SURF2OFF Switch off Arc Length Control ARC_OFF Switch off Determinant check DETEROFF Local Dent Formulation DENT_TYPE type Switch off Local Dent formulation DENT_OFF Override default max number of steps CMAXSTEP max_step Eigenvalue analysis EIGENVAL KeyWord Value Bifurcation analysis CBIFURC idcomb idstep ibifsw Numerical Procedure Parameters Page 6 3 30 Iteration control CITER cmin cneg itmax isol epsit cmineg Iteration control Light Version LITER itmax Control of repeated plastification unloading CUNFAL max_on off Time integration parameters CDYNPAR alpha beta gamma Predictor corrector method PCOR_ON Direct implicit time integration PCOR_OFF Material Plasticity Modelling Page 6 3 32 Elasto plastic material beam column MISOIEP matno E mod poiss yield density term exp Control of cross section yield surface size GBOUND geono Z Zp Zips Zp Nonlinear spring definition MREF matno refx refy refz refrx refry refrz spring property references Elasti
59. Morrison s equation Drag and Mass coefficients used in Morrison s equation Lift coefficients normal to fluid flow NOTE Not implemented hydro Buoyancy calculations are based on this diameter Internal diameter of the pipe Relevant in connection with completely flooded members and members with special internal fluid Number of integration points per element Current blockage factor Current is multiplied with this factor Density of internal fluid Relevant for flooded members Thickness of marine growth specified in meter Density of marine growth Specified in kg m Switch 0 1 for flooded non flooded members internal use Switch 0 1 for use of direction dependent drag coefficients If switch is set to 1 special ElmCoeff data have to be defined for the element Fill ratio of flooded member By default is a flooded member 100 filled throughout the simulation Fill ratio could be time dependent Wave kinematics reduction coefficient Particle velocity used for actual elements is multiplied with this factor Specification of buoyancy calculation method By default the buoyancy of the thin steel wall is ignored for flooded members If Level 1 is specified a far more complex and time consuming calculation procedure is used Flooded members on a floating structure going in and out of water should use Level 1 calculation Default Struct Do 0 7 2 0 0 Struct D Do 2T 1 0 1024 0 0 1024
60. NCY _ case Parameter Description Default L_case The buoyancy forces are added to the actual load case If no loadcase WAVEDATA lca is specified the buoyancy forces are added to the WAVEDATA Icase Write Write option Write buoyancy forces are written to a separate file NoWrite NoWrite buoyancy forces are not written to file If BUOYANCY is specified buoyancy effects are accounted for By default all elements are buoyant but using the FLOODED command it is possible to remove buoyancy for selected elements The buoyancy forces are updated every time wave loads are calculated and the current position of the sea surface defines whether an element becomes buoyant or not at any time This record is given once FLOODED elnox1 elnox2 elnoxn Parameter Description Default elnox1 External element number 1 to be defined flooded elnox2 External element number 2 elnoxn External element number n to be defined non buoyant This record is used to define non buoyant elements and this command has only meaning if BUOYANCY is specified It is recommended to use the new input see below This record may be repeated FLOODED ListType Id_List Parameter Description Default ListType Data type used to specify the elements Element The specified Id s are element numbers Mat i The specified Id s are material numbers Geo i The specified Id s are geometry numbers Id_List Group The specified Id s are group numbers One or several id s
61. RAME described in U F O Format NODE a Bape E EASA a E a a a A ra NO ce BE A a e a a a A a 1 z Node ID X Y Z Boundary code NODE 10 000 000 8 382 NODE 20 1 524 000 8 382 NODE 30 3 048 000 8 382 NODE 40 000 000 6 858 NODE 50 3 048 000 6 858 NODE 60 1 524 000 5 334 NODE 70 000 000 3 810 NODE 80 3 048 000 3 810 NODE 90 1 524 000 2 286 NODE 100 000 000 762 NODE 110 3 048 000 762 NODE 120 000 000 000 s De Die es Do a NODE 130 3 048 000 000 111101 Elem ID np1 np2 material geom lcoor ecc1 ecc2 BEAM 10 60 50 1 4 1 BEAM 20 70 60 1 4 1 BEAM 30 40 60 1 4 2 BEAM 40 60 80 1 4 2 BEAM 50 90 80 1 3 1 BEAM 60 100 90 1 3 1 BEAM 70 70 90 1 3 2 BEAM 80 90 110 1 3 2 BEAM 90 40 20 1 2 1 BEAM 100 20 50 1 2 2 BEAM 110 40 50 1 4 3 BEAM 120 70 80 1 4 3 BEAM 130 100 110 1 4 3 BEAM 140 10 20 3 5 3 BEAM 150 20 30 3 5 3 BEAM 160 10 40 2 1 4 BEAM 170 30 50 2 1 4 BEAM 180 40 70 2 1 4 BEAM 190 50 80 2 1 4 BEAM 200 70 100 2 1 4 BEAM 210 80 110 2 1 4 BEAM 220 100 120 2 1 4 BEAM 230 110 130 2 1 4 1 1 Dicker ee E Sate Rete Oe a ante are Stig Siete a Ste al aah at hl e et a eed GEOMETRY Rs a ee ee one E AE Or he a at i le eed ke 1 Geom ID Do Thick PIPE 1 0 32385 0 007137 PIPE 2 0 15240 0 003175 PIPE 3 0 12700 0 003048 PIPE 4 0 10160 0 002108 1 Geom ID H T web W top T top W bot T bot Sh y Sh z IHPROFIL 5 1 40 0 027 1 22 0 050 1 22 0 050 1 Loc Coo dx dy dz UNITVEC 1 707 000 7
62. SI units N and m If f inst the length unit is mm L_fac 1000 Z_top Z_coordinate to the top of soil layer 1 relative to mudline typical 0 0 Z_bott Z_coordinate to the bottom of soil layer 1 relative to mudline Soil_ID The actual layer is defined by a API_SOIL record with this ID This record is used to define the Soil Characteristics referred to on the PILE record and at the middle of each soil layer a discrete spring representing the soil is inserted automatically This record may be repeated SPRIL_MOD model Parameter Description Default model Spring model to be used to model the soil nonlinear behaviour 0 This record is used to select the type of spring element to be used in connection with modelling of the soil nonlinear characteristics Two alternatives are available model 0 old nonlinear spring model step scaling model 1 new plasticity formulation no step scaling iterations are recommended at least 1 iteration This record is given once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 67 Input Description USFOS Control Parameters SPRIDAMP lt DoF gt lt Cdamp gt lt Elem1 gt lt Elem2 gt Parameter Description Default DoF Actual Spring degree of freedom Axial or 1 Axial degree of freedom of spring is damped ShearY or2 Y translation degree of freedom is damped ShearZ or3 Ztranslation degree of freedom is damped Torsion or4 Torsion degree of freedom is damped Ymoment o
63. SS1 BNMASS BNINCO AMATRIX ADMLOAD AMDSTIFF Page 6 4 3 6 4 4 6 4 6 6 4 11 6 4 12 6 4 14 6 4 17 6 4 23 6 4 24 6 4 25 6 4 26 USFOS 2010 01 01 USFOS USER S MANUAL 6 4 2 Input Description SESAM Structural file format RECORD parameter parameter parameter IDENTIFICATOR no 1 no 2 no 3 Parameter Description Default parameter Description of contents and default no 1 parameter Description of contents and default no 2 parameter Description of contents and default no 3 Optional box for comments notes exceptions etc The data items listed as dummy are set by the SESAM interface file format They are skipped by USFOS However they must be present in the input data stream or succeeding items of that record will be misinterpreted When input is given manually there is no need to split input records over more lines USFOS uses free format reading One data record starts with the record identificator and terminates when the next record identificator is encountered Whether this is at the next line or after several lines of data items is irrelevant to USFOS as long as the correct number of data items are given and the specified order of the data items is satisfied USFOS 2010 01 01 USFOS USER S MANUAL 6 4 3 Input Description SESAM Structural file format 6 4 1 Geometry Data GNODE nodex nodeno Parameter Description Default nodex External node number specified by th
64. USFOS USER S MANUAL 6 1 1 Input Description USFOS Control Parameters Table of Contents 6G UNpUt DEseriptrOMmssc isScciieleseissaceccssscasnsdstacdectbalaavsths stacesbnes cedbataaagesua a a as NSSS 6 1 1 6 1 General information y reeet ena ed e aE fat Seca eee as sae aaa gee eas aa 6 1 1 6 2 Formale a T A svi enaey AEA ENTE AT eee ates 6 2 1 6 2 1 Comments rne e Ee pE ETA tran aL Ea adel 6 2 1 6 3 Userinputdescritlon e enie e e E E e ia E A eie 6 3 1 6 3 1 General orane seven caddecansadotensct agunepensccesochs ouueatsdadeauctedeaendidgaevectsedennssdatucanaacented 6 3 6 6 3 2 oad Control ye snie e e ite Mei trea len E e doe asia 6 3 8 6 3 3 Dynamic Modelling Parameters ce eseessecsseceseceeceseceseeeseeesneseneeeaeeaeceaeenseeees 6 3 18 6 3 4 Analysis Control Parameters ceeeseceseceseceseceseeeseeeseeeeaeeeaeecaeecaaecaecaecnaeenseenes 6 3 26 6 3 5 Numerical Procedure Parameters 0 cescescsseceseceseeeseeeeeeeeaeesseecsaecaeensecnaeenseenes 6 3 30 6 3 6 Material Plasticity Modelling neierens iiteraria 6 3 32 6 3 7 Member Modeling reniant it a hativess ott eda te tenses ee E tee eee 6 3 37 6 3 8 Joint Modellin o sri ss shechesteieeestaaaceetecsacabhedsacdeead En sageenguacetees tagdveakeaete ota a E ESAR 6 3 47 6 3 9 Foundation Modelling ron sienen ah docesedensoehsedaceesees 6 3 58 6 3 10 Fracture Ductility Control oes eeseceseceseceecesneesseeeseecaaeceaecaecsseceseeeseesseeeeneesaes 6 3 69 6 3 11 Fire Temperature
65. X Y and Z direction mx my mz Concentrated Rotation Mass about X Y and Z axis NOTE Zeros at the end of the record may be omitted and will be treated as zero mass with following exception If only M_x is specified M_y and M_z are assigned the same value With this record the user defines a concentrated mass Example 1 NODEMASS 10200 1000 0 defines a mass in X Y and Z direction at node 10200 Example 2 NODEMASS 10500 0 0 0 0 1000 0 NODEMASS 10500 0 0 0 0 1000 0 0 0 0 0 0 0 define both a mass in Z direction at node 10500 This record may be repeated NODTRANS Trans ID Parameter Description Trans ID User defined external node transformation number T44 133 The 9 terms in the 3x3 Transformation matrix T With this record the user defines a rotation transformation matrix to be used to define skew boundary conditions at nodes or defining local coordinate system for the 1 node spring to ground This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 7 Input Description UFO Structural file format LocNMass RefType NodelD ElemID Unit RefType Reference Type Node NodelD Actual node with a concentrated mass ElemID The Concentrated mass properties are referred to the Element s local coordinate system With this record the user defines that the concentrated nodal masses are referred to a given element s local coordinate system Example Ty
66. _bott T_bott Shear_Y Shear Z Parameter Description Geom ID User defined external geometry number H Height of the profile T_web Thickness of the web W_top Width of the top flange T_top Thickness of the top flange W_bott Width of the bottom flange T_bott Thickness of the bottom flange Shear_Y Shear area factor of Y axis Shear area Shear_Y Calculated shear area Shear_Z Shear area factor of Z axis Shear area Shear_Z Calculated shear area If Shear_Y and Shear_Z are omitted or equal to zero Shear_Z and Shear_Z are both set equal to 1 0 With this record the user defines a I H profile to be used in the finite element analysis This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 24 Input Description UFO Structural file format PLTHICK Geom ID Thick Parameter Description Geom ID User defined external geometry number Thick Plate Thickness With this record the user defines a plate thickness to be used in the finite element analysis This record may be repeated LSECTION GeomID H T_side Width T_bott _symm Parameter Description Geom ID User defined external geometry number H Height of the profile T_side Thickness of the vertical part Width Width of the profile T_bott Thickness of the horizontal part of the profile _symm Symmetry switch Ooromitted opposite L 1 tL NOTE If thickness of horizontal part is omitted thickness for the vertical part is used I
67. a multiple of this value and the instantaneous value of the time history assigned through the LOADHIST record If the velocity history defined in the referred TIMEHIST is the absolute velocity the reference values should be set 1 0 For movement in directions different from the global axes the reference values are used to define the actual directions see example 2 NODEDISP Note that the NODEVELO data are given priority above the conventional boundary conditions both free and fixed dofs may become prescribed USFOS 2010 01 01 USFOS USER S MANUAL 6 3 133 Input Description USFOS Control Parameters NODEACC case Node_ID dof_code Values Parameter Description Default _case Load Case number for the prescribed accelerations which is referred to on the LOADHIST record Node_ID External node number dof_code Integer number defining the prescribed degrees of freedom The dof s are specified from 1 through 6 in global coordinates 1 acceleration component in global X direction etc see under NODEDISP Values Reference values for the prescribed acceleration components 0 0 zero defined fixed dof NOTE Values should only be specified for the dof s defined in the dof_code This record defines prescribed acceleration The dof_code is formed by the dof numbers for all prescribed degrees of freedom at the node written consecutively without blanks See NODEDISP for example of use Internally in USFOS the prescrib
68. actor for z axis direction Shear area sfz shear area calculated by USFOS Height of beam at local node 2 NOT relevant for USFOS Shear buckling factor for y axis direction Shear buckling factor for z axis direction This record contains sectional geometry for an or H type cross section This record consists of three lines Shear area calculated by USFOS for the local y and z directions As I t S where moment of inertia y z axis t thickness S static moment y z axis z BT TT HZJ Vie HZI TY TB BB __ eo Shear buckling effects are discussed in the USFOS Theory Manual USFOS 2010 01 01 USFOS USER S MANUAL 6 4 8 Input Description SESAM Structural file format geono hzi ty tb tt by sfy sfz hzj Parameter Description Default geono Geometry number referred to in GELREF1 Height of beam et local node 1 Thickness of vertical walls webs of box section Thickness of bottom flange Thickness of top flange Width of beam Shear area factor of y axis Shear area sfy shear area calculated by USFOS Shear area factor of z axis Shear area sfz shear area calculated by USFOS Height of beam at local node 2 not relevant to USFOS This record contains the cross sectional geometry of a box type cross section This record consists of three lines Shear area calculated by USFOS for the local y and z directions As I t S where moment of inertia y z axis t thickness S st
69. ad increment 0 001 This record is used to specify static initialization of a dynamic analysis with all loading controlled through time NOTE This option should be used only when the structure responds almost linearly without yielding step scaling and should_not be used for pushover analysis Example STATIC 1 0 0 100 0 50 0 1 DYNAMIC 10 0 0 020 0 50 0 1 means that the first second is used to apply f inst deadweight loadcases with no inertia effects accounted for From time 1 0 the analysis is transferred to an ordinary dynamic analysis Mxdisp is not defined which means that this criteria is not active Nstep is not defined which means that an infinite number of steps could be used to reach time 1 0 Minimum step size is 0 001 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 13 Input Description USFOS Control Parameters DYNAMIC End_Time Delta_T dT_res dT_term Parameter Description Default End_Time Continue the dynamic analysis with the specified time increment to the specified End_Time is reached Delta_T Time increment to be used until End_ Time is reached dT_res Time between saving of results on the raf file dT_term Time between print to terminal This record is used to specify dynamic analysis with all loading controlled through time This record may be repeated Example 0 001 0 10 1 0 1 DYNAMIC 0 0 010 0 50 0 1 DYNAMIC 10 0 0 020 0 50 0
70. af file This record is given once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 8 Input Description USFOS Control Parameters 6 3 2 Load control CUSFOS nloads npostp mxpstp mxpdis Icomb Ifact mxild nstep minstp Icomb Ifact mxild nstep minstp Icomb Ifact mxld nstep minstp Parameter Description Default nloads Number of load specifications Icomb lfact mxld nstep minstp Used in connection with restart of analyses Sect 4 7 npostp Number of load steps in the post collapse range mxpstp Max load step size in the post collapse range mxpdis Max incremental displacements in the post collapse range Suggested value is 1 0 Load combination or load case number Load factor Size of the initial unscaled load increment specified as a factor of the reference load The current load vector is repeated until the accumulated load reaches the relative load level mxid specified as a factor of the reference load OR until the current load vector has been incremented nstep times Both mxid and nstep may be specified at the same time the load is incremented until either of the conditions are satisfied For a zero value of mxid or nstep no test of upper limit is performed minstp Minimum load increment for automatic load step scaling Specified as a fraction of the total load combination or load case Not multiplied by Ifact Suggested value is 0 001 mxld where mxid is the maximum of the mxia s within the actual load combination
71. als should be user defined using MFRACT records because the local conditions flaw size etc can not be predicted generally This record is given once MFRACT matno crit CTOD O Parameter Description Default matno Material number Crit CTOD Critical crack tip opening displacement Ultimate stress typical value 1 3 oy Ultimate strain corresponding to ou typical value 0 15 Strain level at the beginning of hardening typical value 20 0 ey Flaw size Critical CTOD and the flaw size parameter a should have the same dimension This record specifies additional information to the MISOIEP record with the same material number Note The value of the fracture check is strongly dependent on the input parameters It is the responsibility of the user to give adequate data for the critical CTOD and the flaw size Confer Sect 3 15 Element Fracture for a discussion of this The following condition should also be satisfied if the fracture check is to be used crit CTOD lt mg a Oy where oy yield stress USFOS 2010 01 01 USFOS USER S MANUAL 6 3 70 Input Description USFOS Control Parameters USERFRAC List_Type Crit_Type Criterion ID_List Parameter Description Default ListType Definition of the ID_List specified Actual List Types Element The ID_List contains Element ID s Material The ID_ List contains Material ID s and all beam elements referring to the actual material ID s get the actual Use
72. arer Result deformed model must be activated with displacement scaling factor 1 0 By pointing on the sea surface using the option Clip Element the surface will disappear NOTE Sl units must be used N m kg with Z axis pointing upwards This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 103 Input Description USFOS Control Parameters CURRHIST Parameter Description Default Time of first point Scaling factor of the defined speed at first time Similar for all points defining the time history of the current With this record the user may specify a time history of the current The current specified under CURRENT will be scaled according to the specified time history This record is given only once REL_VELO nAvrg If REL_VELO is specified the relative velocity between the structure and the wave particles are accounted for in connection with the calculation of drag forces This is also the way to switch on hydro dynamical damping Option 1 If the relative velocity should be calculated on basis of an average structural velocity the average velocity of the nAvrg last analysis steps is used NAvrg 0 is default which means that the current structural velocity is used This record is given only once WavCase1_ l case iTotal Parameter Description Default l case The generated loads are written to file with case as the first loadcase number Each time new wave forces are calcul
73. arties acting under authorisation from the above USFOS 2010 01 01 USFOS USER S MANUAL 6 3 53 Input Description USFOS Control Parameters JSURFSIZ z us nodex1 nodex2 Parameter Description Default Zy Extension size of the yield surface relative to the reference bounding 0 50 surface Sect 4 3 2 Zin Extension size of the bounding surface full plastic capacity 1 00 relative to the reference bounding surface Sect 4 3 3 nodex1 External node number of joint 1 nodex2 External node number of joint 2 NOTE If no nodes are specified all joints defined get the actual surface ratios With this record the user may change the default values of the ratio of elastic and plastic section modulus of the joint model It is then possible to scale the actual joint capacities f inst calculated according to API see CHJOINT This is an useful option in connection with Sensitivity studies where joint capacities are important Cases where some joints are damaged reducing the bounding surface Cases with reinforces joints expanding the bounding surface etc This record may be repeated Example JSURFSIZ 0 95 1 5 JSURFSIZ 0 50 1 0 101 102 103 will change the yield surface size to 0 95 and the bounding surface size to 1 5 of the initial reference bounding surface for all joints except for nodes 101 102 and 103 USFOS 2010 01 01 USFOS USER S MANUAL 6 3 54 Input Description USFOS Control Parameter
74. ata 10011 Rayl_All 1 0E 2 3 0E 4 Two damping data packets are defined One with stiffness proportional damping only and one with both mass and stiff proportional damping This record could be repeated ElemDamp Damp _ID ListType Id List Parameter Description Default Damp_ID Actual Damping Property ID ListType Actual Element Element ID list Material Material ID list All All elements are given the actual damping properties Actual List of ID s With this record the the user may specify general damping to be be referred to from individual elements used in a Dynamic Analysis Example 1 i DampID ListType ID_List ElemDamp 10010 All Assign Damp Prop 10010 to all elements ElemDamp 10011 Mat 200 300 Assign to special thereafter With this record damping for each element is defined NOTE This record is an extended alternative to the RAYLDAMP input and override data specified under the RAYLDAMP input This record could be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 21 Input Description USFOS Control Parameters LUMPMASS rotmas Parameter Description Default rotmas Rotational mass scaling factor 0 01 This record is used to prescribe use of a lumped mass formulation for the structural finite element in connection to dynamic analysis If rotmas is set to zero the mass terms associated with rotation at the element nodes are zero ref USFOS Theory Manual Sect 14 This record is given only once
75. ated the forces are written and the loadcase number is incremented with one iTotal iTotal 0 Incremental forces are written iTotal 1 Total forces are written The user may use this record to let USFOS write to file the forces generated in connection with the options WAVEDATA CURRENT WINDFIELD Together with the beamload records the LCASETIM record is printed connecting the loadcase to a physical time for the actual load NOTE This option should be used only if USFOS is used as a wave load pre processor due to the extra time consumption and disc space requirements This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 104 Input Description USFOS Control Parameters M_GROWTH Parameter Description Default Z coordinate of the first gridpoint defining the marine growth profile Z 0 defines the sea surface and all Z coordinates are given relative to the sea surface Z axis is pointing upwards Z gt 0 means above the sea surface Additional thickness to be applied on members at elevation Z Z coordinate of the second gridpoint defining the marine growth profile Additional thickness to be applied on members at elevation Z With this record the user may define a marine growth depth profile to be applied to the structural members Between the tabulated values the additional thickness is interpolated values outside the table are extrapolated The hydrodynamical diameter Dnya Dstruc 2 Ad
76. atic moment y z axis USFOS 2010 01 01 USFOS USER S MANUAL 6 4 9 Input Description SESAM Structural file format Parameter Description Default geono Geometry number referred to in GELREF1 di Inner diameter of pipe dy Outer diameter of pipe t Thickness of pipe Shear area factor of y axis Shear area sfy shear area calculated by USFOS Shear area factor of z axis Shear area sfz shear area calculated by USFOS This record contains the cross sectional geometry of a pipe cross section This record consists of two lines Shear area calculated by USFOS for the local y and z directions As l t S where moment of inertia y z axis t thickness S static moment y z axis USFOS 2010 01 01 USFOS USER S MANUAL 6 4 10 Input Description SESAM Structural file format GELTH geono th dummy dummy Parameter Description Default geono Geometry number referred to in GELREF1 th Thickness of the element This record contains of the plate thickness of the deck plate element This record consists of one line USFOS 2010 01 01 USFOS USER S MANUAL 6 4 11 Input Description SESAM Structural file format 6 4 4 Element Data GECCEN eccno ex ey Parameter Description Default eccno Eccentricity number referred to in record GELREF1 ex Eccentricity vector in global coordinates The vector points from the ey global node towards the local element node ez This record
77. atyp dummy dummy dummy dummy dummy dummy np sig eps1 sig2 eps2 as sign np eps np Description Default Material number Material type matyp 4 Elastoplastic with kinematic hardening matyp 2 Nonlinear hyperelastic matyp 0 Nonlinear hyperelastic Parameters generated by SESAM preprocessor with no relevance for the present material model Number of points to represent the uniaxial stress strain force displacement curve for increased loading Note NP lt 25 Stress force at the first point representing the stress strain curve force displacement curve Corresponding strain displacement at the first point representing the stress strain curve force displacement curve Stress at the second point representing the curve Corresponding strain at the second point representing the curve Stress force at the last point representing the curve Corresponding strain displacement at the last point representing the curve see figure With this record the force displacement moment rotation curves for nonlinear spring element are defined USFOS 2010 01 01 USFOS USER S MANUAL 6 4 14 Input Description SESAM Structural file format 6 4 6 Boundary Conditions BNBCD nodeno ndof fix1 fix2 fix3 fix4 fix5 fix6 Parameter Description Default nodeno Internal node number ndof Number of degrees of freedom ndof 6 fix1 Boundary condition of relevant degrees of freedom in global degrees of fix2 freedom fix3 fixi 0 f
78. be replaced by the new CombLoad option CNODES ncnods nodex idof dfact nodex idof dfact Parameter Description Default ncnods Number of load control nodes Used in connection with restart analyses Sect 4 7 External user specified number of control node Global degree of freedom to be used in the control displacement 1 X displacement 2 Y displacement 3 Z displacement Weight factor of the specified DOF This record is used to specify the Control Displacement of the structure The Control Displacement is calculated as a balanced average of the specified DOF s multiplied with their respective weight factors Sect 4 2 2 Also the global displacements of these nodes are printed to the Analysis Control File outprint gt 0 Sect 8 1 4 If only print is required at selected nodes the nodes may be specified with dfact 0 0 This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 12 Input Description USFOS Control Parameters STATIC End_Time Delta_TdT_res dT_term mxdisp nstep minstp Parameter Description Default End_Time Continue the static analysis with the specified time increment to the specified End_Time is reached Delta_T Time load increment to be used until End_Time is reached dT_res Time between saving of results on the raf file 10 D_T dT_term Time between print to terminal DT mxdisp Max total displacement 0 0 nstep Max number of steps 0 minstp Minimum lo
79. bers which are wet at the time of load calculation and relative velocity is accounted for if the record REL_VELO is specified in the control file All wave definitions with same loadcase number will be applied at the same time adding the wave kinematics before the forces are calculated irregular wave Current to be combined with the actual wave must have same load case number The travelling speed of the wave is influenced by the current Time between calculation of wave forces is controlled by the referred TIMEHIST record dTime The calculated wave forces are written to file if WAVCASE1 is specified in the control file In XACT the surface elevation is visualized Applying a mesh on the surface Verify Show mesh the waves become clearer Result deformed model must be activated with displacement scaling factor 1 0 By pointing on the sea surface using the option Clip Element the surface will disappear NOTE Sl units must be used N m kg with Z axis pointing upwards This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 101 Input Description USFOS Control Parameters WAVEDATA Lcase Type Hs Tp Direct Seed Surflev Depth N_ini X1 nFreq SpecType TMin TMax Grid Opt Data Parameter Description Default _case Load case number The wave is activated by using the LOADHIST command referring to this load case number a TIMEHIST of type 3 Type Wave Type Spect Unit Significant Wave height m P
80. c to plastic transition parameters MPLASMON matno cl al c2 a2 c3 a3 and hardening parameters c4 a4 c5 a5 c6 a6 Elastic to plastic transition parameters MPLASCYC matno cl al c2 a2 c3 a3 and and hardening parameters c4 a4 c5 a5 c6 a6 Member Modelling Page 6 3 37 Control of plastic hinges in members CELHINX elnox ihini ihin2 ihinmid Control of plastic hinge alt input PLASTHIN ihini ihin2 ihinm elnox1 elnox2 Internal Hinge of Beam Elements BEAMHING ixl iyl izl irx1 iryl irz1 ix2 iy2 iz2 irx2 iry2 irz2 elnox1 elnox2 Define member initial imperfection groups GIMPER impgrp impshpe angle offset dent1 dent2 dentmid Assign initial imperfection to member GELIMP elnox impgrp Linear dependencies Shim elements BLINDP2 insl iem ix iy iz irx iry irz Non structural members NONSTRU ListType List Structural members override NONSTRU STRUCTEL ListType List Linear Elements LIN_ELEM Form ListType List Beam type definition BEAMTYPE Type ListType List Analysis Calibration Initial deformations CINIDEF Size ColumnCurve Pattern LoadCase Initial deformation from Eigenvalue analysis BuckMode EigenMode no Scale Factor Grouted Members Grouted GroutMatID ListType IDList Local Element Transformation Update ElmTrans Type nod end ListType IDList USFOS 2010 01 01 USFOS USER S MANUAL 6 3 3 Input Description USFOS Control Parameters Joint Modelling Page 6 3 47 Joint flexibility SHELL nodex elnoxl elnox2 d t Overlapping braces at jo
81. c6 Ditto for z force a6 x moment y moment z moment This record is used to specify material hardening parameters and elasto plastic transition parameters for the material under monotonous loading conditions The default hardening properties refer to the condition where elasto plastic transition is performed see record CPROPAR If elasto plastic transition is not performed the default values are zero c2 c6 need not be given if they are equal to c1 a2 a6 need not be given if they are equal to a1 Below and example describes the a parameter s impact on the stress strain curve Typical Steel material with E 210 000Mpa and Yield 355Mpa The hardeing is fixed to 0 2 in the example USFOS Material Model Medium USFOS Material Model f L a wet a pie oe aa We 02 02 03 1 5 Strain Strain Q o o 2 aA Stress MPa Rigid Green curve Medium Red curve Soft Blue Curve UltraSoft Pink curve Default a2 NOO OO a gt N an oo o ou ou i This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 36 Input Description USFOS Control Parameters MPLASCYC matno c1 at c2 a2 c3 a3 c4 a4 c5 a5 c6 a6 Parameter Description Default matno Material reference number c1 Hardening parameter for x force 0 014 al Elasto plastic growth parameter for x force 0 84 c2 Hardening parameter for y force 0 024 a2 Elasto plastic gro
82. city should be calaculated based on a diameter 5 0m the pile capacity is still based on D T 1 22 0 030 USFOS 2010 01 01 USFOS USER S MANUAL 6 3 65 Input Description USFOS Control Parameters SOILCHAR ID Type Z Mud D ref F_fac L fac Z top Z_bott P Y T Z Q Z Z top Z_bott P Y T Z Q Z Z top Z bott P Y T Z Q Z Parameter Description Default User defined number used to identify the Soil Characteristics referred to on the PILE record Soil Data Type 1 Soil is defined through predefined curves Z_coordinate of Mudline The soil data are given relative to mudline The Z axis is pointing upwards Reference Diameter Soil data has been generated for this diameter Scaling factor for the force unit used in the soil curves Scaling factor for the length unit used in the soil curves Z_coordinate to the top of soil layer 1 relative to mudline typical 0 0 Z_coordinate to the bottom of soil layer 1 relative to mudline P Y data is defined by the referred curve f inst MISOPL ELPLCURV P is force per unit length of pile Y is deformation of soil T Z data is defined by the referred curve f inst MISOPL ELPLCURV T is force per unit length of pile Z is deformation of soil Q Z data is defined by the referred curve f inst MISOPL ELPLCURV Q is Tip force Z is tip deformation This record is used to define the Soil Characteristics referred to on the PILE record and at the middle of each soil layer a discrete
83. d Each eigenvector is stored as global displacements for dummy load steps which follow the last real loadstep in consecutive order This record may be used switch on the bifurcation analysis USFOS 2010 01 01 USFOS USER S MANUAL 6 3 30 Input Description USFOS Control Parameters 6 3 5 Numerical Procedure Parameters CITER cmin cneg itmax isol epsit cmineg Parameter Description Default cmin Iterations omitted for current stiffness value between cmin and cmineg 0 000 cneg Definition of large negative current stiffness 2 0 itmax Max number of iterations 10 isol Number of iterations between updating of stiffness matrix 1 epsit Convergence criterion for iterations cmineg Iterations are omitted for current stiffness value between cmin and cmineg This record may be used to switch on iteration and to change default program parameters Note Iterations should not be performed if the SHELL option is activated This record is given once LITER itmax Parameter Description Default itmax Max number of iterations 1 This record may be used to switch on Light iteration with possibility to change the itmax only The other parameters are fixed CITER default parameters see above Note Iterations should not be performed if the SHELL option is activated This record is given once and if CITER is specified before LITER these parameters are kept except itmax CUNFAL max on off Parameter Description Defa
84. d nodes The nodes are listed directly node ID list or all in once Example 1 Chg _Boun 111000 Node 101 102 103 The command implies that nodes 101 102 103 will be translation fixed and rotation free in the analysis independent on how the boundary conditions are defined in the structural file Example 2 Chg_Boun 000000 All 11111 Chg_Boun 1 Node 1001 1002 1003 1004 The command implies that all nodes get boundary condition free for all degrees of freedom except for the four nodes 1001 1002 1003 1004 which are fully fixed This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 99 Input Description USFOS Control Parameters SWITCHES Keyword SubKey Value Parameter Description Default KeyWord Definition of actual switch parameter Available keywords SubKeys SubKey KeyWord SubKey Description WaveData Timelnc Time beween hydrodyn calculation NoDoppler Switch OFF Doppler effect NoStore Do not store data for visualization of wave StatusPrint MaxElem Specify max element on the status print Write FE_Model Dump FE model incl generated elements Iteration RLF_Calc Activalte Residual Load Factor method Nodedata DoublyDef Accept doubly def node Ids Coordinates have to be identical With this record the user may override the boundary conditions defined on the structural file In the analysis the specified boundary codes are applied to all listed nodes The nodes are listed directly node
85. d to define Diameter and thickness of piles varying as function of depth NOTE 1 This record overrides the diameter and thickness defined under PILEGEO NOTE 2 The Z axis is pointing upwards This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 64 Input Description USFOS Control Parameters SOILDIAM ID D_soil Dummy D_soil Dummy z D_soil Dummy Parameter Description Default ID User defined number used to identify the Pile Geometry referred to on the PILE record Z_coordinate of Mudline Pipe data are given relative to mudline Z coordinates of the part of the piles to apply the specified Do and T relative to mudline defined above Diameter to be used in the soil capacity calculations within the actual Z coordinate range Dummy parameter which must be typed in This record is used to define Diameter to be used for the soil capacity calculations if the diameter is different from the actual steel pile s outer diameter NOTE 1 This record will not influence the diameter and thickness used for the piles itself NOTE 2 The Z axis is pointing upwards This record may be repeated Example Nod2 Soil_ID_ Pile_Mat Pile_Geo PILE 101 99 100 10 i Type Diam Thick PILEGEO Single 1 22 0 030 Z Mud Z Top Z Bott SoilDiam Dummy SOILDIAM 10 Single 0 0 50 0 1 22 0 0 50 0 55 0 5 00 0 0 In this example the steel pile has a diameter of 1 22 but from depth 50m below mudline the soil capa
86. d to joint 1010 will use a gap of 0 050 Gap NodID Brace1 Brace2 Brace3 Example 4 JOINTGAP 0 070 1010 20100 20101 20102 This will force a gap 0 070 to be used for joint 1010 braces 20100 20101 and 20102 The other braces connected to joint 1010 as well as all other joints with ChJoint specified will use the gap computed on basis on the structural model coordinates and eventual offsets USFOS 2010 01 01 USFOS USER S MANUAL 6 3 55 Input Description USFOS Control Parameters JNT_FORM form NodelDs Parameter Description Default Form FE formulation for the joint elements introduced by the CHJOINT 0 option Capacity level or capacity multiplier 0 Beam column representation Default on old versions of USFOS but no longer recommended The three hinge mechanism in the beam column element may introduce numeric instabilities for the small joint elements P 6 spring representation Un coupled P d curves with ductility limits will be generated automatically for each joint degree of freedom based on the capacities specified under the CHJOINT record s Plasticity formulation including brace load interaction and joint re classification as specified by the JntClass record Node_IDs_ Node s for which the formulation should be applied NOTE If no nodes are specified all joints get the actual formulation Use of the CHJOINT option will introduce extra elements in the FE model The behaviour of these elem
87. d to specify the elements Element The specified Id s are element numbers Geo The specified Id s are geometry numbers Group The specified Id s are group numbers Ild_List One or several id s separated by space With this record the user may define time dependent buoyancy on the individual elements The elements are specified either directly element list or in directly using material geometry or group references Example 1 BuoyHist 10 Mat 156 All elements referring to materials 1 5 or 6 will have a time dependent buoyancy according to time history with Id 10 Example 2 BuoyHist 10 Mat 1 5 6 BuoyHist 77 Elem 1001 1002 1003 All elements referring to materials 1 5 or 6 will have a time dependent buoyancy according to time history with Id 10 Elements 1001 1002 and 1003 will follow history no 11 NOTE The last definitions will override previous definitions if same element is defined more than once This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 118 Input Description USFOS Control Parameters BUOYFORM Form ListType Ild_List Parameter Description Default Form Buoyancy Formulation Arch Simple Archimedes calculation Panel Based on Pressure dyn static ListType Data type used to specify the elements Element The specified Id s are element numbers Geo The specified Id s are geometry numbers Group The specified Id s are group numbers Ild_List
88. d_T In the out file the hydrodynamical diameter is listed for all potential wet beam elements Data should be specified above the sea surface according to the measured marine growth Ensure that extrapolation gives correct Add_T dry elements become wet due to surface wave elevation Thickness of marine growth at actual position NOTE Sl units must be used N m kg with Z axis pointing upwards This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 105 Input Description USFOS Control Parameters Hyd_CdCm Cd Cm elnox1 elnox2 elnoxn Parameter Description Default Cd Drag Coefficient to be applied to the listed elements 0 7 Cm Mass Coefficient to be applied to the listed elements 2 0 elnox1 External element number 1 to be defined with the actual Cd Cm All elnox2 External element number 2 elnoxn External element number n to be defined with the actual Cd Cm NOTE If no elements are specified all beam elements will be defined with the actual Cd and Cm This record is used to assign Drag and Mass Hydrodynamical Coefficients to beam elements Example Hyd_CdCm 0 7 1 8 Hyd_CdCm 1 0 2 0 1010 1020 1030 2010 2020 2030 New default Cd Cm are applied to all beam elements However elements 1010 1020 1030 2010 2020 and 2030 are defined with different Cd and Cm coefficients the latest Hyd_CdCm definition overrides previous definitions NOTE This record overrides Cd and Cm defined und
89. diameter and thickness Do Outer Diameter of the pile T Wall Thickness of the pile This record is used to define a single pile geometry type 1 This record may be repeated PILEGEO ID Type Do T nPile y_loc z_loc y_loc z_loc y_loc3 Z_locs Parameter Description Default ID User defined number used to identify the Pile Geometry referred to on the PILE record Pile Type Pile type 2 means a pile group with specified data Outer Diameter of piles Wall thickness of piles Number of identical piles in this group Y coord from PILE element axis to pile 1 centre local pile coord Z coord from PILE element axis to pile 1 centre local pile coord Y coord from PILE element axis to pile 2 centre local pile coord Z coord from PILE element axis to pile 2 centre local pile coord This record is used to define a Pile Group geometry type 2 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 63 Input Description USFOS Control Parameters PILE_D T ID Parameter Description Default ID User defined number used to identify the Pile Geometry referred to on the PILE record Z_coordinate of Mudline Pipe data are given relative to mudline Z coordinates of the part of the piles to apply the specified Do and T relative to mudline defined above Outer Diameter of piles within the actual Z coordinate range Wall thickness of piles within the actual Z coordinate range This record is use
90. e and all Z coordinates are given relative to the surface Z axis is pointing upwards Z gt 0 means above the sea surface Mass Coefficient to be used for elements at elevation Z Z coordinate of the second gridpoint defining the Cm profile Mass Coefficient to be used for elements at elevation Z2 This record is used to define a Mass Coefficient depth profile Between the tabulated values the Cm is interpolated Values outside the table are extrapolated In the out file the mass coefficient is listed for all potential wet beam elements Data should be specified above the sea surface Ensure that extrapolation gives correct Cm dry elements become wet due to surface wave elevation The command Hyd_CdCm overrides this command he Mass Coefficient at actual position NOTE Sl units must be used N m kg with Z axis pointing upwards This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 108 Input Description USFOS Control Parameters Wave_KRF KRF Parameter Description Default KRF Wave Kinematics reduction Factor 1 0 Particle Velocities are multiplied by this factor The user may use this record the user may specify the reduction factor to be used in connection with calculation of wave forces WAVEDATA 2 D theory may over estimate the kinematics of real 3 D ocean waves and reduction of the particle velocities may give better correspondence with field measurements The corrected
91. e implemented defined in MN MegaNewtons and m meters respectively If the impact force exceeds the maximum indentation force p3 no further indentation of ship energy absorption is calculated Default ship indentation data are used if p1 p2 p3 and d1 are left out MULT_IMP This record is used to swith ON multiple impact analysis which means that several BIMPACT record could be executed in sequence The option is used in connection with fracture control of impacted members and makes it possible to let the impact energy be absorbed by several members This record is given once Example Pos Energy extent xdir ydir zdir ship BIMPACT 2 14E6 00 1 0 0 0 BIMPACT 2 0 0 00 1 0 0 0 MULT_IMP Elem TypCrit Crit USERFRAC 11 Strain 0 15 CUSFOS 10 15 1 0 1 0 LCase IFact mxld nStep MinStp 2 1 0 0 0 200 0 01 3 1 0 0 0 200 0 01 It is specified an impact on element 11 and for strain above 15 the elment becomes fractured If element 11 failed before all 14 MJ was absorbed the remaining energy will be applied as a new impact on element 121 Load case 2 is terminated when elem 11 fails and next Cusfos line is activated Load Case 3 is also a BIMPACT load and the remaining energy from loadcase 2 is added to the energy specified for BIMPACT 3 which here is 0 0 USFOS 2010 01 01 USFOS USER S MANUAL 6 3 82 Input Description USFOS Control Parameters BIMPDATA Type Data Parameter Description Defau
92. e is Node or Material no 1 if Type is Mat Node number 2 if Type is Node or Material no 2 if Type is Mat With this record the the user may specify initial velocity for a Dynamic Analysis Example 1 i Typ Time Velo Mat_ID Ini_Velo Mat 0 0 15 00 0 O O 1001 will assign a X velocity of 1 5 m s to all nodes on the body with material ID 1001 from time 0 0 Example 2 Typ Time Velo Mat_ID Ini_Velo Mat 10 00 20 000 2002 will assign a Y velocity of 2 0 m s to all nodes on the body with material ID 2002 at time 10 seconds This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 23 Input Description USFOS Control Parameters Dynres_N Type Node_ ID Dof Node_2 Dof_2 Parameter Description Default Type Actual Node result type Disp Nodal Displacement Vel Nodal Velocoty Acc Nodal Acceleration RelDis Relative displacement between 2 nodes dofs extra node and dof required Node_ID Actual Node ID of which dynamic results should be saved Dof Actual Nodal degree of freedom X displacement Y displacement Second node relevant if RelDis only Secon node degrees of freedom relevant if RelDis only With this record the the user may specify nodal quantities to be saved every step during a Dynamic Analysis independent on the raf file saving interval Results are stored on a separate file named lt prefix gt dyn and these time histories are accessed from XACT This record
93. e repeated SFOS 2010 01 01 USFOS USER S MANUAL 6 3 120 Input Description USFOS Control Parameters SpoolWave Time Order dT StormLen Crit Unit Time The analysis starts time seconds before the actual peak s Order Select 1 2 3 etc highest wave crest by specifying 1 2 3 etc A negative number means the 1 2 3 etc Jowest wave through dT Time increment during search for the peak waves s StormLen Search for highest waves frim time 0 to time StormLen s Critl Criterion to use for selection of peak wave Elev Peak Wave Elevation is used With this record the user defines how to search for the highest waves in an irregular wave field The analysis time 0 will be moved forward to the specified Time before Peak as shown in the figure Start Time Peak elevation before Peak Wave height m 2360 2380 2400 2420 2440 2460 2480 2500 2520 2540 Time sec 0 Analysis Time Example 1 Time Order aT StormLen Crit SpoolWave 30 1 0 5 3600 elevation Search for the highest wave elevation within a 1 hour storm the wavedata command is specified separately A delta T of 0 5 seconds is used during this check Example 2 Time Order aT StormLen Crit SpoolWave 30 3 0 5 3600 elevation Search for the 3 highest wave elevation within a 1 hour storm To ensure that the 2 3 etc peaks are not a part of any of the higher peaks a minimum time between peaks are required In the
94. e user nodeno Internal nodenumber This record contains the correspondence between external user defined node numbering and internal node numbering in USFOS This record consists of one line and has to be repeated once for every nodal point in the structure GCOORD nodeno xcoord ycoord zcoord Parameter Description Default nodeno Internal node number specified by the user xcoord Cartesian x y and ycoord z coordinates of node nodeno zcoord This record contains coordinates of each node This record consists of one line and has to be repeated once for every nodal point in the structure USFOS 2010 01 01 USFOS USER S MANUAL 6 4 4 Input Description SESAM Structural file format 6 4 2 Connectivity Data The GELMNTI record is compulsory and contains the internal node numbers at the element ends This record also contains the correspondence between external user defined element numbers and internal element numbers The GELREF1 record is compulsory and contains reference to element data GELMNT1 elnox elno eltyp nodin1 nodin2 nodin3 nodin4 Parameter Description Default elnox External element number specified by the user elno Internal element number eltyp Element type number 15 Beam element 2 nodes 18 Spring to ground 1 node 9 Membrane element 4 nodes nodin1 Internal node number of local node 1 nodin2 Internal node number of local node 2 This record defines the element topology a
95. eak period of spectre Direction of wave relative to global x axis counter clockwise dg Wave seed input to random generator Surface Level Z coordinate expressed in global system Water depth Number of initialization points defining wave envelope see previous page and Figure 6 1 Number of frequencies SpecType Specter type Jonswap Jonwap Spectre PM Pierson Moscovitz User User Defined Spectre Lowest wave period to be used in the wave representation Highest wave period to be used Discretization type 1 Constant dw in the interval tmin tmax 2 Geometrical series from Tp 3 Constant area for each S w bar Optional Data If Jonswap Gamma parameter If User Defined Number of points in the w S w curve Else i Dummy If User Defined i The nPoint w S w points defining S w Else Dummy With this record the user may specify an irregular wave to be applied to the structure as hydrodynamic forces as described on the previous page Example LCase Typ Hs Tp Dir Seed SurfLev Depth nIni WaveData 3 Spect 12 8 13 3 45 12 0 176 0 nFreq SpecTyp TMin TMax Grid 30 Jonsw 4 20 See the example collection on www usfos com for more examples This record is given once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 102 Input Description USFOS Control Parameters Normal wave Ramping Flat sea Figure 6 1 Initialisation of wave CURRENT _case Speed Direct Surflev Depth Z Parameter Description Defau
96. ecord may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 17 Input Description USFOS Control Parameters LOADHIST L_Case_ Time_Hist Parameter Description Default L_Case Loadcase number of the load vector s to be activated according to the specified Time History Time_Hist Time History ID which is used to scale the specified loadvector s This record is used to specify the loads to be activated during a dynamic analysis with all loading controlled through time The different time histories defines when the loads connected to these time histories should be activated scaled deactivated The loadvectors are multiplied scaled with the actual time history scaling factor at the time If the scaling factor is 0 the actual load is not activated see TIMEHIST definition This record may be repeated Example LOADHIST 1 LOADHIST 5 LOADHIST 7 means that both loadvectors 1 and 5 are activated according to time history with ID 10 while loadvector 7 is controlled through time history 1000 INI_TIME Time Parameter Description Default 0 0 Time Initialization time This record is used to specify an initialisation phase used f ex in connection with analyses of slender structures The USFOS clock is reset to zero when the time is reached together with the structural displacements which also are set to zero The initialisation phase is removed from the result file raf file and the initialised pos
97. ed acceleration history NODEACC TIMEHIST defines the history is integrated to prescribed displacement history and applied as prescribed displacement The generated history is identified on the out file with ID Original_ID gt Accelartaion Displacement E Accelartaion history Displacement history Note that the values are reference values the total acceleration will be a multiple of this value and the instantaneous value of the time history assigned through the LOADHIST record If the velocity history defined in the referred TIMEHIST is the absolute acceleration the reference values should be set 1 0 For movement in directions different from the global axes the reference values are used to define the actual directions see example 2 NODEDISP Note that the NODEACC data are given priority above the conventional boundary conditions both free and fixed dofs may become prescribed This record could be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 134 Input Description USFOS Control Parameters SOILACC case Type data dof_code Values Parameter Description Default _ case Load Case number for the prescribed displacement which is referred to on the LOADHIST record Type Definition type Type 1 The soil is identified by Z_top Z_bott Type 2 The Soil is identified by the Pile ID Depends on Type 1 or Type 2 For Type 1 Data Z Top Z Bott Soil Coordinate System F
98. efines the material properties and geometry with ID 17 defines the cross section The local coordinate system is defined by the unit vector with ID 4 No eccentricities Example 2 BEAM 100200 100 200 1174 3334 defines the beam in Example 1 with following difference End 1 of the beam has an eccentricity defined by an eccentricity vector with ID 33 End 2 of the beam has an eccentricity defined by an eccentricity vector with ID 34 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 10 Input Description UFO Structural file format SPRNG2GR Elem ID Node Material L_Coor Ecc Parameter Description Elem ID User defined external element number of the spring to ground Node The spring is connected to the user defined external node number Material User defined material number defining the spring characteristic L_Coor User defined transformation matrix number defining the local coordinate system of the spring If omitted local coordinate system and global system are equal The spring to ground has an eccentricity defined by user defined Ecc NOTE Zeros at the end of the record may be omitted With this record the user defines a 1 node spring to ground element to be used in the finite element analysis Example 1 SPRNG2GR 1020 85 1020 defines a spring to ground element with ID 1020 connected to the node with ID 85 The spring characteristic is defined by a material with ID 1020 T
99. ent load Example 1 BEAMLOAD 5 1020 1000 0 BEAMLOAD 5 1020 1000 0 0 0 0 0 BEAMLOAD 5 1020 1000 0 0 0 0 0 1000 0 0 00 0 define all a uniform distributed load with intensity 1000 in global X direction acting at element 1020 with load case number 5 Example 2 BEAMLOAD 5 1021 0 0 1000 0 0 0 0 0 2000 0 BEAMLOAD 5 1021 0 0 1000 0 0 0 0 0 2000 0 0 0 define both a distributed load with intensity 1000 in global Y direction at end 1 of element 1021 and intensity 2000 at end 2 of the element The load case number is 5 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 16 Input Description UFO Structural file format PRESSURE Load Case Elem ID pi Parameter Description Load Case Load Case Number Elem ID User defined external element number 2 D element p1 p4 Normal pressure intensity at node 1 4 of the element NOTE If only p1 is specified p2 p4 are given the same intensity i e constant pressure over the entire element surface With this record the user defines a normal non conservative pressure load Example 1 PRESSURE 2 1234 100 PRESSURE 2 1234 100 100 100 100 define both a constant normal pressure with intensity 100 acting at element 1234 with load case number 2 Example 2 PRESSURE 4 1234 100 200 300 400 defines a normal pressure with intensity 100 at node 1 200 at node 2 etc of element 1234 The load case number is 4 This record may be repeated SFOS 2010 01
100. ents will be assigned according to the selected joint capacity rule or specified joint capacity The FE formulation for the joint elements is selected by the JNT_FORM record P d curves option 1 are derived from the actual capacities as follows Displacement 0 1 of Chord diameter defines yielding confer JSURFSIZ Displacement 1 0 of Chord diameter defines maximum force moment Displacement 5 0 of Chord diameter defines end of maximum capacity Displacement 10 of Chord diameter defines fracture of joint The generated curves are printed in the out file and the peak capacities will be printed using the Verify Element Information option in Xact NOTE If JNT_FORM is not specified following defaults are used for the various joint capacity rules API i formulation no 0 UserSurface formulation no 0 UserSpring formulation no 1 MSL formulation no 3 It is possible to mix different Capacity rules and FE formulations in same analysis This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 56 Input Description USFOS Control Parameters TLAS ere interval Parameter po Default interval Joints will be re classified according to geometry and force state at specified intervals during the analysis The joint capacities will be updated according to the revised classification P curves for each joint degree of freedom and the Q factor will be updated 0 Nojoint classificatio
101. er the commands Hydro_Cd and Hydro_Cm see next pages This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 106 Input Description USFOS Control Parameters Hydro_Cd Parameter Description Default Z coordinate of the first gridpoint defining the Cd profile Z 0 defines the sea surface and all Z coordinates are given relative to the surface Z axis is pointing upwards Z gt 0 means above the sea surface Drag Coefficient to be used for elements at elevation Z Z coordinate of the second gridpoint defining the Cd profile Drag Coefficient to be used for elements at elevation Z2 This record is used to define a Drag Coefficient depth profile Between the tabulated values the Cd is interpolated Values outside the table are extrapolated In the out file the drag coefficient is listed for all potential wet beam elements Data should be specified above the sea surface Ensure that extrapolation gives correct Cd dry elements become wet due to surface wave elevation The command Hyd_CdCm overrides this command he Drag Coefficient at actual position NOTE Sl units must be used N m kg with Z axis pointing upwards This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 107 Input Description USFOS Control Parameters Hydro _Cm Parameter Description Default Z coordinate of the first gridpoint defining the Cm profile Z 0 defines the sea surfac
102. ernal element number defining the second CHORD element geono When user defined capacity is used this parameter is dummy but a dummy parameter must be given rule Capacity rule switch 101 User defined Joint Springs nbraces Number of Braces connected to the actual joint brace Brace element ID of first brace Mref_ID ID of MREF record defining the nonlinear spring properties of brace 1 connection Data for all braces connected to the joint are required With this record the capacity of each brace chord connection of the tubular joint will be limited by the user defined P_d curves defining the behaviour of the joint This check will impose restrictions on the load transfer through each brace chord connection at the specified joint USFOS 2010 01 01 USFOS USER S MANUAL 6 3 51 Input Description USFOS Control Parameters CHJOINT nodex elnox1 elnox2 geono rule alpha1 alpha2 alpha3 alpha4 alphad nbraces brace1 axial torsion Mipb Mopb Parameter Description Default nodex External node number referring to the joint where shell effects should be considered elnox1 External element number defining one of the two elements connected to the node elnox2 External element number defining the second CHORD element geono Dummy when rule 3 rule Capacity rule switch 3 User defined capacity and surface definition alpha1 5 Parameters used to define the actual surface nbraces Number of braces connected to the actual j
103. external referred to in f inst record BEAM unix Unit in global coordinates The vector specifies the direction along local element z axis uniy uniz With this record the user specifies a unit vector to be used in connection with f inst defining local coordinate system of beam elements This record may be repeated ECCENT Parameter Description Ecc ID Eccentricity number external referred to in f inst record BEAM ex Eccentricity vector in global coordinates The vector points from the global node ey towards the local element node ez With this record the user specifies an eccentricity vector This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 21 Input Description UFO Structural file format ADDMBEAMmx my mx Elem_11D Elem_2 ID Parameter Description Added mass intensity of the local X direction of the beam element Added mass intensity of the local Y direction of the beam element Added mass intensity of the local Z direction of the beam element Elem_1 ID User defined external element number 1 beam element Elem_2 ID User defined external element number 2 NOTE If no elements are specified all beam elements are specified with the actual added mass With this record the user defines added mass data for beam elements Example 1 ADDMBEAM 0 1000 1000 defines added mass in X direction 0 0 Y and Z direction 1000 applied on all beam elements This record may be
104. f both width and thickness of the horizontal part are omitted the width is set equal to the height and the thickness for the vertical part is used With this record the user defines an open angle section to be used in the finite element analysis Example 1 LSECTION 15015 0 150 0 015 defines a regular angle with thickness 0 015 and width height 0 150 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 25 Input Description UFO Structural file format GENBEAM GeomID Area It ly Iz Wpx Wpy Wpz Shy Shz Parameter Description Geom ID User defined external geometry number Area Cross sectional area It Torsion moment of inertia ly Moment of inertia about y axis Iz Moment of inertia about z axis Wpx Plastic torsional section modulus Wpy Plastic sectional modulus about y axis Wpz Plastic sectional modulus about z axis Shy Shear area in direction of y axis Shz Shear area in direction of z axis With this record the user defines a general cross section to be used in the finite element analysis This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 26 Input Description UFO Structural file format 6 5 5 Material Data SPRIDIAG Mat ID S41 Soo 33 Suq S55 See Parameter Description Mat ID User defined external material number S11 See Diagonal terms of the linear 6x6 spring to ground stiffness matrix NOTE Zeros at the end of the record may be omitted Wi
105. fault elno Internal element number np Number of points along beam length for which data are given c i Distance along the element from node 1 to the position no lt i gt tot am j i Added mass intensity for the j th DOF in the beam element local coordinate system at point no i This record defines added mass data for the beam element generated by the wave load module WAJAC This record consists of four lines NOTE This record has been changed in connection with the 7 7 release of USFOs in order to match the new official SESAM format USFOS 2010 01 01 USFOS USER S MANUAL 6 4 24 Input Description SESAM Structural file format 6 4 9 Nodes with point masses BNMASS nodeno ndof mass1 mass2 mass3 mass4 mass5 mass6 Parameter Description Default nodeno Internal node number ndof Number of degrees of freedom ndof 6 mass Mass with respect to first degree of freedom mass2 Mass with respect to second degree of freedom mass3 mass4 mass5 mass6 This record specifies the nodal point masses for each relevant degree of freedom This record consists of two lines USFOS 2010 01 01 USFOS USER S MANUAL 6 4 25 Input Description SESAM Structural file format 6 4 10 Nodes with inital conditions BNINCO dummy dtype dummy dummy nodeno ndof velo1 velo2 velo3 velo4 velo5 velo6 Parameter Description Default dtype Type of condition Only legal value 2 velocity nodeno Internal node number ndof N
106. ferred to user defined external numbers These files may be written with a text editor or generated by preprocessors Page Analysis identification 6 5 4 HEAD Nodal Data 6 5 4 Definitions Node definition NODE Options Node Loads NODELOAD Node Mass NODEMASS Local Coord at Nodes NODTRANS Time dependent masses WEIGHT Element Data 6 5 9 Definitions 2 Node Beam BEAM 1 Node Spring to Ground SPRNG2GR 4 Node Membrane Element MEMBRANE 4 Node Shell Element QUADSHEL 3 Node Shell Element TRISHELL 8 Node Solid Element SOLID8 Options Distributed Load BEAMLOAD Normal Pressure PRESSURE Distributed Shell Load SHELLOAD Sub Dividing Beam elements REFINE Unit Vector UNITVEC Eccentricity ECCENT Added Mass of Beam elements ADDMBEAM Initial out of straightness BANANA USFOS 2010 01 01 USFOS USER S MANUAL Input Description UFO Structural file format 6 5 2 Cross Section Data 6 5 22 Pipe PIPE Box RHS BOX VH Profile THPROFIL Plate Thickness PLTHICK L Section LSECTION General Beam GENBEAM Channel Section CHANNEL Rectangular Bar Massive RECTBAR Un symmetrical I profile USYMMI Material Data 6 5 26 Diagonal Linear Spring 6x6 SPRIDIAG Full Linear Spring 6x6 SPRIFULL Hyper elastic P 5 curve HYPELAST Elasto Plastic P 5 curve ELPLCURV Elastic Isotropic ELASTIC Misc Data 6 5 32 Gravity Load GRAVITY Rotating Acceleration field ACCFIELD 2010 01 01 USFOS USFOS USER S MANUAL 6 5 3 Input Description UFO Structura
107. ff Deg Coeff y Parameter Description Default Geo_ID Cross section geometry ID Type Input Type 0 Height Profile Height Profile Width Number of points deg coeff defining the Tangential Curve 0 not imp Number of points deg coeff defining the Drag coefficient curve Number of points deg coeff defining the Lift coefficient curve Number of points deg coeff defining the Moment curve Cross section posistion angle Corresponding coefficient NOTE The four curves are given in sequence starting with the Tangential curve Np_T grid points then Np_D Drag coefficient points etc Total number of coefficient points are then NoT NpD NpL NpM This record is used to define the aerodynamic coefficients for one cross section ID This record may be repeated Example 1 Pipe Cross section with diameter 0 55m GeolD Type H W npt npd npl npm Deg Coeff WINDPAR 1001 0 0 55 0 55 0 1 0 0 0 0 0 7 Example 2 Cross section GeolD Type H W npt npd npl npm Deg Coeff WINDPAR 2001 0 0 8 0 6 0 5 3 1 180 1 0 90 2 0 O 1 0 90 180 180 0 180 0 USFOS 2010 01 01 USFOS USER S MANUAL 6 3 128 Input Description USFOS Control Parameters W_Coeffs ID Type Data Unit ID Wind Coefficient ID a number to be referred to Type Coefficient Type to define Drag Drag Coefficient Cd Lift Lift Coefficient Cl Moment Torsion Moment Cm Tang Tangential longitud Ct Data Actua
108. from T1 to T2 With this record the user specifies a time history used to control the time for applying for example deadweight and buoyancy gradually jac fl T2 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 16 Input Description USFOS Control Parameters TIMEHIST histno Constinc dTime Fact Fac2 Facn Parameter Description histno Time history number user defined ID type Time Hist Type Constlnc type 6 dTime The constant time increment between the tabulated values Fac 1 Scale factor 1 Fac 2 Scale factor 21 Facn Scale factor n With this record the user specifies a time history by discrete points where the time between each point is constant This is a special version of the Points time history type and is recommended for extreme long time series reduced memory requirement and faster simulation Values between the tabulated points are interpolated values outside the specified range are extrapolated This record may be repeated TIMEHIST histno Sine Amp Period Phase tStart nPer Parameter Description histno Time history number user defined ID Time Hist type Type 2 Sine Function Amp Aplitude Period Perod fPhase Phase degrees tStart Start time for sine function Function value 0 for T lt tStart nPer Number of Periods to apply With this record the user specifies a time history following a sine function A This r
109. gt z Z_top Z_bott lt Data gt Z_top Z_bott lt Data gt Nonlinear Soil Spring Model SPRI MOD model Spring Damping Dashpot SPRIDAMP DoF C Elem_1 Elem_2 Automatic calculation of P Y T Z and Q Z API_SOIL ID Soiltype LoadType Data Fracture Ductility Control Page 6 3 69 Fracture check switch CFRACT Fracture criterion definition MFRACT matno crit ctod oy Eu ea User defined member fracture USERFRAC elnox Type lt Crit gt USFOS 2010 01 01 USFOS USER S MANUAL 6 3 4 Input Description USFOS Control Parameters Fire Temperature Response Analysis Page 6 3 71 Member temperature fields BELTEMP llc elnox to tygrad trorad PEPCrackAng Member temperature fields ELEMTEMP llc type data_set iell iel2 iel3 Temperature fracture check switch CTFRACT Temperature fracture criterion definition TFRACT matno T fract Sy fract E fract Temperature dependent material properties steel STEELTDEP curve_no matnol matno2 saa aluminum ALUMTDEP curve_no matnol matno2 saa user defined reduction curve TDEPFUNC curve_no type Data user defined material USERTDEP mat_nodep_E dep_yield dep_plasticdep_exp Load case vs time definition LCASETIM l case time Fire Collapse check FIRECHK LCase_Chk YieldRed ERed TempLim Ship Impact analysis Page 6 3 79 Ship impact BIMPACT ldcs elnox elpos energy extent xdir ydir zdir ship Ship indentation characteristics MSHIP ship pl p2 p3 dl Dynamic ship impact DYNIMPCT ldcs elnox elpos V_shi
110. he actual internal hinge External element number n to be defined with the actual internal hinge elnoxn NOTE If no elements are specified all beam elements will be defined with the actual internal hinge definition This record is used to assign internal hinges to beam elements This record may be repeated Example BEAMHING 1 BEAMHING 1 111 1111 111 1111 00 11 1010 1020 1030 2010 2020 2030 Default internal hinge is changed from fully connected default to released bending degrees of freedom at both ends of the elements applied to all beam elements However elements 1010 1020 1030 2010 2020 and 2030 are defined with fully connected joints at both ends the latest BEAMHING definition overrides previous definitions NOTE This option should be used with care Due to nonlinear geometrical effects the release of some degrees of freedom could be valid at the first step only This is obvious in connection with release of the two shear degrees of freedom no 2 and 3 where the vertical component of the axial stiffness will become more and more significant as the beam axis rotates USFOS 2010 01 01 USFOS USER S MANUAL 6 3 39 Input Description USFOS Control Parameters GIMPER impgroup impshape angle offset dent1 dent2 dentmid Parameter Description Default impgroup Reference number of imperfection group impshape Shape of initial deformation Sine functions 0 Both ends rotated eo Ps 1 End 1 undeformed ae
111. he local coordinate system is parallel to the global system and no eccentricity is defined Example 2 SPRNG2GR 1020 85 1020 200 33 defines the spring in Example 1 with following difference The local coordinate system of the spring is defined by the NODTRANS record with ID 200 The spring has an eccentricity defined by an eccentricity vector with ID 33 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 11 Input Description UFO Structural file format MEMBRANE Elem ID nodi nod2 nod3 nod4 mat geom e1 e2 e3 e4 Parameter Description Elem ID User defined external element number nod1 Node 1 of the membrane is connected to the user defined external nod1 nod2 Node 2 of the membrane is connected to the user defined external nod2 nod3 Node 3 of the membrane is connected to the user defined external nod3 nod4 Node 4 of the membrane is connected to the user defined external nod4 User defined material number defining the material properties of the element User defined geometry number defining the thickness of the element Node 1 of the membrane has an eccentricity defined by user defined Node 2 of the membrane has an eccentricity defined by user defined Node 3 of the membrane has an eccentricity defined by user defined Node 4 of the membrane has an eccentricity defined by user defined NOTE Zeros at the end of the record may be omitted With this record the user defines a membrane element
112. ho Power WindField 11 Uniform 10 10 0 Min input WindField 12 Z Profile 10 10 0 0 QO 1 293 0 2 Max input WindField t3 3D_Tabl 0 0 QO E30 1590 14293 Max input This record could be repeated 2010 01 01 USFOS USER S MANUAL 6 3 126 Input Description USFOS Control Parameters WindHist DOF Hist_ID Unit DOF Actual Wind Vector Degree of Freedom X or 1 X Component of wind vector Y or 2 Y Component of wind vector Z or 3 Z Component of wind vector Hist_ID The Actual Wind Vector is Scaled according to the time history command TimeHist with the actual ID With this record the user defines the Global wind Filed to be used in the simulations Example LCase Type Ux Uy Uz Z0 Zbott Rho Power WindField AA Uniform 10 10 0 Min input 2 Dof HistID WindHist X 101 WindHist Y 102 i HistID Type Ty T2 fac TimeHist 101 S_Curve 0 10 1 0 TimeHist 102 S Curve 20 30 1 0 Means that the X component of the wind will be initialized gradually from 0 10 m s between time 0 and 10 sec Up to time 20s the Y component is zero From time 20 the Y component gradually increases and from time 30s both X and Y components are 10m s which gives a speed of 14 1m s with 45 direction This record could be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 127 Input Description USFOS Control Parameters WINDPAR Geo_ID Type Height Width Np T Np D Np L Np M Deg Coeff Deg Coe
113. ined Non Structural This record may be repeated Plusros 2010 01 01 USFOS USER S MANUAL 6 3 96 Input Description USFOS Control Parameters GROUPNOD Group ID Node Node2 Nodes Parameter Description Default Group ID Actual Group ID Node Nodes to be included in the actual group With this command the user may specify nodes to become members in the actual group By default the nodes to which the elements in a given group are attached to become members in the actual group In connection with the NONSTRU command loads on non structural members are transferred to nearest node within same group with at least one structural member attached If the loads should be guided towards special nodes if for example all nodes in a given group are attached to non structural members only including these nodes in the actual group will ensure correct load transfer If wanted the forces on the non structural conductors could be transferred automatically to the nearest jacket legs This record may be repeated Flus FOS 2010 01 01 USFOS USER S MANUAL 6 3 97 Input Description USFOS Control Parameters Chg Mat Mat_Id Type Id_List Parameter Description Default Mat_ID Material ID to be used to override existing reference Type Data type used to specify the elements Element The specified Id s are element numbers Geo The specified Id s are geometry numbers Group The specified Id
114. int with OVERLAP nodex elnobl elnob2 local flexibility specified Joint capacity check minimum input CHJOINT nodex elnoxl elnox2 geono Joint capacity check extended input CHJOINT nodex elnox elnox2 geono CapRule alphal alpha2 alpha3 alpha4 alphaS nbraces bracel axial torsion Mipb Mopb brace2 axial torsion Mipb Mopb bracen axial torsion Mipb Mopb Joint capacity check MSL char CHJOINT nodex elnoxl elnox2 geono CapRule CapLevel Q Surface Size for Joints JSURFSIZ Size_Y Size_B nodex1 nodex2 User Defined Joint Gap JOINTGAP Gap NodelID brace brace2_ Joint Capacity Formulation JNT_FORM form_no NodeID_List Joint Classification Interval JNTCLASS interval Control of plastic hinges at nodes CNOHINX nodex hinmx Foundation Modelling Page 6 3 58 Spudcan element SPUDMAT matno Type MSPUD matno R B y c v V pre Gv Gu Gr YFSW Cs Pile elements PILE ID Nodex Nodex2 Soil_ID Pile Mat Pile Geo Local_coord Imper Pile geometries Single Pile PILEGEO ID Type Do T Pile geometries Pile Group PILEGEO ID Type Do T nPile y_loc z_loc y_loc z_loco y_loc z_loc Depht varying Pile Diam and Thickn PILE_D T ID Z_Mud Z top Z_bott Do T Z_top Z_bott Do T Z_top Z_bott Do T Depht varying Soil Diam override default SOILDIAM ID Z_Mud Z top Z_bott Do Dummy Z_top2 Z_bott Do Dummty2 Z_top Z_bott Do Dummy Soil characteristics SOILCHAR ID Type Z Mud D_ref_ F_ fac L_fac Z_top Z_bott lt Data gt Z_top2 Z_bott lt Data
115. ition becomes the un deformed reference position This record is given once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 18 Input Description USFOS Control Parameters 6 3 3 Dynamic Modelling Parameters RAYLDAMP alpha1 alpha 2 Parameter Description Default alpha1 Mass proportional damping coefficient alpha2 Stiffness proportional damping coefficient This record is used to control structural damping according to the Rayleigh damping model If the damping ratio is known for two individual structural frequencies the damping parameters may be chosen as follows 2002 ai A1 2 A201 2 M1 2 2A2 1A1 2 2 2 W1 Q2 Asymptote w 0 Damping ratio 1 1 2 a w aw 6 0 Angular frequency w USFOS 2010 01 01 USFOS USER S MANUAL 6 3 19 Input Description USFOS Control Parameters DampRatio Ratio_1 Ratio _2Freq_1 Freq_2 History Parameter Description Default Ratio_1 Damping ratio at frequency 1 1 damping is given as 0 01 Ratio_2 Damping ratio at frequency 2 Freq_1 Frequency 1 given in Hz Freq_2 Frequency 2 given in Hz History Time history optional scaling the actual damping ratios as a function of time If omitted or set equal to 0 the damping is kept constant during the analysis With this record the the user may specify the damping to be used in a Dynamic Analysis Rayleigh damping coefficients alpha_1 and alpha_2 are calculated on ba
116. ity of each brace chord connection at the tubular joint will be checked according to a selected joint capacity equation This check will impose restrictions on the load transfer through each brace chord connection at the specified joint By default the extra elements representing the connection capacities are general beam elements From version 7 4 it is possible to switch to Joint Springs using the record JNT_FORM 1 P_d curves are then derived from the actual capacities as follows Displacement 0 1 of Chord diameter defines yielding confer JSURFSIZ Displacement 1 0 of Chord diameter defines maximum force moment Displacement 5 0 of Chord diameter defines end of maximum capacity Displacement 10 of Chord diameter defines fracture of joint The generated curves are printed in the out file and the peak capacities will be printed using the Verify Element Information option in Xact Beam Beam Two extra nodes Two extra elements Conventional joint model Joint with capacity check included USFOS 2010 01 01 USFOS USER S MANUAL 6 3 50 Input Description USFOS Control Parameters CHJOINT nodex elnox1 elnox2 geono rule nbraces brace Mref_ID brace Mref_ID brace Mref_ID Parameter Description Default nodex External node number referring to the joint where shell effects should be considered elnox1 External element number defining one of the two elements connected to the node elnox2 Ext
117. l Irregular Wave to Peak SPOOLWAV TimeBeforePeak Order dT StormLength Crit Non Hydrodynamic Elements NONHYDRO ListType IDlist Hydrodynamic Parameters Powerful HYDROPAR KeyWord Value ListType IDlist Aerodynamics Page 6 3 124 Wind Definition New Syntax WINDFIELD l_case Type Ux Uy Uz Zo Zbott Rho power Wind History WINDHIST DOF Hist_ID Wind Cross Sect Basic Coefficients W_COEFFS ID Type Data Wind Cross Sect Coefficients Combine W_COEFFS ID Combine ID_drag ID_lift ID_mom Assign Coefficients to Element ELMCOEFF ID ListType IDs Wind Definition Old syntax WINDFIELD lcase Tini Z_bott U10 power rho WO_x WO_y WO_z alpha beta gamma n_ini Aerodynamical parameters for cross sections WINDPAR GeoID Type height width npt npd npl np m Ct Cd Cl sss Cm Compute Max Wind MAXWIND Criterion dT EndT Write Max Wind options MAXWIND Keyword ICase Earthquake Page 6 3 131 Prescribed nodal displacement NODEDISP l_case dof_code Prescribed values for the dofs Prescribed nodal velocity dynamic only NODEVELO l_case dof_code Prescribed values for the dofs Prescribed nodal acceleration dynamic only NODEACC lcase dof_code Prescribed values for the dofs Prescribed Soil displacement SOILDISP l_case Type 2 Pile_ID dof_code values for the dofs Prescribed Soil acceleration dynamic only SOILACC l case Type 1 z_Top z_Bott dof_code values for the dofs USFOS 2010 01 01 USFOS USER S MANUAL 6 3 6 Input Description USFOS Control Parameters
118. l file format The input records is presented in a standard frame with the following format RECORD Parameter Parameter Parameter IDENTIFICATOR No 1 No 2 No 3 Parameter Description Description of contents and default values Description of contents and default values Description of contents and default values Optional box for comments notes exceptions etc NOTE Parameters written in bold set are mandatory Parameters in regular set are optional and default values will be used if omitted USFOS 2010 01 01 USFOS USER S MANUAL 6 5 4 Input Description UFO Structural file format 6 5 1 Analysis identification Character 9 to 80 from each line are stored as text strings This record is given only once 6 5 2 Nodal Data Node ID ix iy iz irx iry irz Parameter Description Node ID User defined external node number X y Z X Y and Z coordinate of the node ix Boundary condition code for X direction of the actual coordinate system used at the node 0 Free 1 Fixed iy iz irx Similar boundary condition codes for the remaining 2 translation degrees of freedom iry irz and 3 rotation degrees of freedom NOTE Zeros at the end of the record may be omitted This implies that by omitting the 6 boundary codes the node is free in all 6 degrees of freedom With this record the user defines a nodal point to be used in the finite element analysis Example 1 NODE 10200 1 00 04 0 000000 NODE 10200 1 0
119. l pairs a coefficient values With this record the user defines the Basic Aerodynamic Coefficients This record could be repeated W_Coeffs ID Combine IDpracg IDurtr IDmom Unit ID Wind Coefficient ID a number to be referred to Combine Keyword indicating that the command is used to combine basic drag lift and moment coefficient tables info one coefficient group to be assigned to the actual finite elements IDprac ID of the Drag Coefficient table IDurt ID of the Lift Coefficient table etc With this record the user defines the Combined Set of Aerodynamic coefficients which should be referred to by the Finite elements Example y ID keyword ID Drag ID lift ID mom W_Coeffs 100 combine 101 102 103 Wing Profile W_Coeffs 10 combine 11 Pipe Profile Will create a coefficient set with ID 100 which combines the individual drag lift and moment coefficient definitions The next set uses only drag coefficient for pipes This record could be repeated USFOS l 2010 01 01 USFOS USER S MANUAL 6 3 129 Input Description USFOS Control Parameters ElmCoeff ID List Type ID s Unit ID Wind Coefficient ID either a combined W_Coeffs or a complete coefficient package see above ListType Actual Cross section to assign the wind coefficients to Pipe __ Assign Coeffs to all elements with pipe cross section Elem _ Assign Coeffs to all listed elements
120. le 1 HYPELAST 444 1200 1 00 1000 0 01 1000 0 01 1200 1 00 defines a hyperelastic P 5 curve by 4 discrete points identified by the material number 444 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 28 Input Description UFO Structural file format ELPLCURV Mat ID P 3 Po 52 Ph n Parameter Description Mat ID User defined external material number Py 54 Definition of the first point of the force displacement curve P2 52 Definition of the second point of the force displacement curve Pa Sn Definition of the last point of the force displacement curve NOTE Only points in 1 and 3 quadrant are legal and the first point defines the bottom left end of the curve Max 25 points available With this record the user defines an elastoplastic P 5 curve to be used in connection with definition of a nonlinear spring matrix Example 1 ELPLCURV 555 1200 1 00 1000 0 01 1000 0 01 1200 1 00 defines an elastoplastic P 5 curve by 4 discrete points identified by the material number 555 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL Input Description UFO Structural file format 6 5 29 MATERIAL Mat ID Type Data Parameter Description Mat ID User defined external material number Type Actual Material Type Elasttic Elastic Istotropic Plastic Elasto Plastic CompSpri Compression Spring TensSpri Tension Spring Grout Grout inside pipes
121. ling of Zero length spring the amount of input to define the local coordinate system could be limited to just one line as described in this example Zero length NL Spring e o End 1 End 2 t 7 The Spring properties are referred to the local coordinate system of the beam attached to End 1 of the Spring This record could be repeated lusFos 2010 01 01 USFOS USER S MANUAL 6 3 47 Input Description USFOS Control Parameters 6 3 8 Joint Modelling SHELL nodex elnox1 elnox2 Parameter Description Default nodex External node number referring to the joint where shell effects should be considered elnox1 External element number defining one of the two elements connected to the node elnox2 External element number defining the second chord element d t Diameter and thickness of the chord at the joint respectively canned joint If omitted the data for elnox7 is used With this record a complete shell analysis of the specified tubular joint will be included in the analysis Note Internally in USFOS one extra element and extra nodes are introduced into the finite element model and the CPU consumption of the analysis increases somewhat Beam Two extra nodes One extra element shell property element USFOS 2010 01 01 USFOS USER S MANUAL 6 3 48 Input Description USFOS Control Parameters OVERLAP nodex elnob1 elnob2 Parameter Description Default n
122. lization Algorithm Actual algoritm to use SubSpace or Lanczos Shift Shift parameter used if singular systems Actual value This record is used to perform an eigenvalue analysis for calculation of vibration frequencies and corresponding modes Ref EigenSolvers for structural problems by K Bell The eigenvalues modes are calculated and the mode shapes may be inspected in XACT If the modes are difficult to see small displacements specify the modescale f ex wit ha value 10 NOTE Specification of time is important In order to get correct stresses and thus correct nonlinear stiffness the eigenvalue calculations should be performed when the selfweigth etc is introduced in the structure Available for DYNAMIC analysis only This record could be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 29 Input Description USFOS Control Parameters CBIFURC idcomb idstep ibifsw Parameter Description Default idcomb Load combination to be reached before the bifurcation analysis becomes active idstep Load step to be reached before the bifurcation analysis becomes active ibifsw 0 or lt blank gt 0 Eigenvectors and eigenvalues are calculated and written to the print file at the loadstep where bifurcation is detected The bif file is generated with nodal loads corresponding to the eigenvectors In addition the eigenvectors are written to the result file for XACT presentation and the analysis is then terminate
123. ll shell elements in the model except for the elements 1020 2020 and 3020 which get an intensity of 1000 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 18 Input Description UFO Structural file format SHELPRES Load Case LoTyp Pressure lt List Type gt Data Parameter Description Load Case Load Case Number LoType LoadType Def Pressure Actual Pressure Positive value acts in the direction of local Z axis of the elam lt List Type gt Definition of the ID list next parameter s two different list types are available Element The actual shell load is assigned to the elements given under Data Material The actual shell load is assigned to shell elements with material ID s given in Data Data List of Element ID s if type element or Material ID s if type material NOTE No ID s specified has same meaning as specifying all actual ID s With this record the user defines a distributed conservative shell element load referred to Local coordinate system Example 1 SHELPRES 5 Def 1000 0 Element 1020 2020 3030 Defines a pressure of 1000 N m in local Z direction for elements 1020 2020 and 3020 Example 2 SHELPRES 3 Def 2200 0 Material 245 355 Defines a pressure load case number 3 of 2200 N m7 in local Z direction for all shell elements referred to material ID s 245 or 355 Example 3 SHELPRES 4 Def 2000 0 Element SHELPRES 4 Def 1000
124. lt _case Load case number The current is activated by using the LOADHIST command referring to this load case number a TIMEHIST of type 3 Unit Speed Current Speed to be multiplied with the factor f giving the speed at actual depth if profile is defined m s Direct Direction of wave relative to global x axis counter clockwise deg Surflev Surface Level Z coordinate expressed in global system m Water depth m Z coordinate of first grid point starting at Sea Surface m Scaling factor of the defined speed at first gridpoint Similar for all points defining the depth profile of the current With this record the user may specify a current to be applied to the structure as hydrodynamical forces The current is switched ON according to the LOADHIST TIMEHIST definition TIMEHIST type 3 must be used If the current should vary over time the CURRHIST command is used Wave forces are applied on the structural members which are wet at the time of load calculation and relative velocity is accounted for if the record REL_VELO is specified in the control file Current to be combined with waves must have same loadcase number Time between calculations of wave forces is controlled by the referred TIMEHIST record dTime The calculated wave forces are written to file if WAVCASE1 is specified in the control file In XACT the surface elevation is visualised Applying a mesh on the surface Verify Show mesh the waves become cle
125. lt Elem ID Element ID of beam element to be replaced by an automatically generated shell element substructure With this record the user specifies the beam element which will be replaced by an automatically generated shell element substructure The beam element properties material wall thickness are transferred to the shell model ARR N IN N N AN RAR Results for the shell substructure are presented in Xact together with the rest of the structure This record may be repeated T lusFos 2010 01 01 USFOS USER S MANUAL 6 3 88 Input Description USFOS Control Parameters SSH_LOAD Lcase ElemID Fx Fy Fz Typ X o Ext_X Ext_Arch Parameter Description Default Lcase Load Case number Elem ID Element ID of the beam element subshell must have been defined Fx Fy Fz Total force to be applied referring to Global Corodinate System Typ Cross section type of the beam Xe Center of the load in x direction referring to local beam coord system Oc Center of the load in direction referring to local beam coord system Ext_X Extent of load in X direction Ext_Arch Extent of load in o direction With this record the user specifies a local load to be applied on a Shell Beam element Definition of o Example i LCase Elem_ID Fx Fy Fz Typ Xc m Phic Deg Ext X m Ext Arch Deg SSH_Load 2 23 10 0E3 0 0 Pipe 1 5 90 0 5 30 In the example a force in global X direction ia applied on beam element no 23 The load is
126. lt Type Data Type to be specified Pile Thick Specification of Pile In Leg data Data contains the thickness and a list of Elements to which hthe pile in leg data should be applied On or more numbers defining the Type This record is used to specify additional data to be used for Boat impact analysis This record is given once Example Type Tick Legelm1 LegElem2 BIMPDATA PileThick 0 035 103 203 303 Inside leg elements 102 203 and 303 piles with thickness 0 035m exist The pile will have impact on the local wall dent growth caused by the concentrated boat impact For boat impact on elements 103 303 the effect from the inner pile will be accounted for USFOS 2010 01 01 USFOS USER S MANUAL 6 3 83 Input Description USFOS Control Parameters DYNIMPCT lIdcs elnox elpos V_ship Mass xdir ydir zdir NL ship Time Parameter Description Default Idcs Load case number elnox External user defined element number elpos Position of impact 1 Impact at member end 1 2 Impact at member end 2 3 Impact at member midspan element is sub_divided V_ship Ship Speed in the actual direction Mass Ship Mass xdir ydir Direction of the impact referred to global coordinates zdir NL_ship Reference number for local ship indentation characteristics 0 record MISOPL 0 Default elastic spring with infinite stiffness gt 0 Resulting hit member and ship indentation and energy is calculated acc
127. mbination This record is used to specify the loading history with load and displacement control parameters Sect 4 1 and Sect 4 2 2 The current load vector Sect 4 1 is incremented until the accumulated load reaches the load level defined by mxid OR until the total displacement reaches the displacement level defined by mxpdis OR when the load vector has been incremented nstep times If a zero value is given for one but not all of the mxid mxdisp or nstep parameters that parameter is disregarded To run an input check simply specify zero values for both mxid mxdisp and nstep That is the specified load vector will be incremented zero times Note In a restart analysis the load history up to the step from which analysis resumes must be excluded This record is given only once and no default values exist USFOS 2010 01 01 USFOS USER S MANUAL 6 3 10 Input Description USFOS Control Parameters COMBLOAD Comb_Case L_Case Factor L_ Case Factor L_ Cases Factor L_Casen Factor Parameter Description Default comb case_ The result of the combination is collected in a load case with number ID Comb_Case This case is referred to in USFos CUSFOS or LoadHist Original definition of this case if any is override L_case First Load_Case contributing to the combination Factor The loads in this load_case are multiplied with Factor etc With this record the user defines a load combination to be generated and
128. ments 0 0 zero defined fixed dof NOTE Values should only be specified for the dof s defined in the dof_code This record defines prescribed displacements The dof_code is formed by the dof numbers for all prescribed degrees of freedom at the node written consecutively without blanks Example 1 NODEDISP 170 12 0 0 1 0 NODEDISP 180 12 1 0 0 0 Example 2 NODEDISP 170 12 0 707 0 707 NODEDISP 180 12 0 707 0 707 Example 3 NODEDISP 5 1703 0 5 NODEDISP 5 1803 0 5 In example 1 the nodes 170 and 180 are both given a prescribed displacement of 1 0 in global X direction global Y displacements are fixed In example 2 the same two nodes are both given a displacement value of 0 707 for both X and Y axis 45 deg In example 3 the same two nodes are both given a prescribed displacement in global Z axis with magnitude 0 5 Note that the values are reference values if input is given in time history format the total displacement will be a multiple of this value and the instantaneous value of the time history assigned through the LOADHIST record If the displacement history defined in the referred TIMEHIST is the absolute displacements the reference values should be set 1 0 For movement in directions different from the global axes the reference values are used to define the actual directions see example 2 If input is given in the conventional CUSFOS format this value will be incremented in the same manner as exter
129. n 1 Continuos joint re classification Joint capacities non linear joint characteristics and the Q factor will be updated at every step in the USFOS analysis n gt 1 Joints will be re classified at every n th step Joint capacities non linear joint characteristics and the Q factor will be updated at every n th step in the USFOS analysis This record is only valid in combination with JNT_FORM 3 i e when the joint elements are represented by the plasticity formulation Ref the JNT_FORM record This record is given once JNTOPTION Keyword Joint ID s Parameter Description Default Keyword Subcommand defining the actual option Grouted The actual joint s uses grouted capacity formulation NoGrouted Grout option is switched Off for the actual joints This record is only valid in combination with CHJOINT option Example 1 JntOption Grouted 1001 2001 3001 Means that the joints 1001 2001 and 3001 are using grouted joint formulation The formulation described under CHJOINT is disregarded NOTE ChJoint must be defined for the actual joints Example 2 JntOption NoGrouted 133 144 Means that the joints 133 and 144 are using the formulation described under CHJOINT NOTE lf the chord members are defined as Grouted and default CHJOINT parameters are used minimum input the joint formulation is changed to Grouted automatically This record may be repeated USFOS 2010 01 01 USFOS USER S MANU
130. n USFOS is used as a stand alone program or if the host analysis system does not supply all parameters i e yield strength or if hardening properties will be changed The default hardening properties refer to the condition where elasto plastic transition is performed see record CPROPAR If elasto plastic transition is not performed the default values are zero c2 c6 are not given if they are equal to c1 a2 a6 are not given if they are equal to a1 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 33 Input Description USFOS Control Parameters GBOUND geono z Parameter Description Default geono Geometry number m Zy Extension size of the yield surface relative to the bounding surface Sect 4 3 2 Material behaviour under monotonous loading Extension size of the bounding surface full plastic capacity Sect 4 3 3 Material behaviour under monotonous loading Extension of the cyclic yield surface relative to the cyclic bounding surface Material behaviour under cyclic loading Extension of the cyclic bounding surface Material behaviour under cyclic loading This record is mandatory for general beams For other cross sections it may be used to change default values Default z yield values are determined by the ratio of elastic and plastic section modulus of typical cross sections lorH def Box def Pipe def The record is only relevant if elasto plastic t
131. n of initial imperfection This record is used to switch on automatic calculation of initial member imperfection for calibration of analysis model to buckling curves Implemented column curves are Curve API WSD SSRC WSD draft ISO NORSOK AISC API LRFD ECCS NS NPD Curve A ECCS NS NPD Curve B ECCS NS NPD Curve C ECCS NS NPD Curve AO ECCS NS NPD Curve E DNV Curve A DNV Curve B DNV Curve C DNV Curve AO DNV Curve E SSRC CSA Curve 1 Lehigh characteristic curve 1 SSRC CSA Curve 2 Lehigh characteristic curve 2 SSRC CSA Curve 3 Lehigh characteristic curve 3 SSRC mean column curve 1 Lehigh mean curve 1 SSRC mean column curve 2 Lehigh mean curve 2 SSRC mean column curve 3 Lehigh mean curve 3 Chen column curve Example CINIDEF 10 1 3 Means that initial imperfections are assigned on all tubular members according to API WSD column curve in direction of the distributed loading for each member under load case 3 This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 44 Input Description USFOS Control Parameters BuckMode Mode No ScaleFact Parameter Description Default Mode No Apply the specified eigen mode as initial imperfection ScaleFact Scale the selected eigen values and add to the user defined structural nodal coordinates This record is used to apply initial imperfections based on an eigen value analysis performed automatically as a pre pr
132. n the analysis is not Newton f ex KN or MN Example WavMxScl 1 0E 6 Will multiply the generated wave forces which are calculated in Newton with 1 0E 6 and the wave forces are then stored in MN This record is given only once WET_ELEM All Parameter Description Default All All elements are assumed potential wet off This record is used to force USFOS to check all elements for hydrodynamic forces during the dynamic analysis By default only elements which can be reached by the highest wave defined are checked for hydrodynamic forces this saves analysis time as f ex the whole topside structure is left out in cases where the highest wave never hit the topside In cases where the structure is dropped from a position above the sea surface this switch should be set ON USFOS 2010 01 01 USFOS USER S MANUAL 6 3 113 Input Description USFOS Control Parameters Wave Int NIS Elem_1 Elem_2 Elem_3 Parameter Description Default Number of Integration sections used for wave force calculations 2 Element 1D of first beam element using NIS integration sections Element ID of second element etc NOTE If no elements are specified all beam elements are using NIS integration sections This record is used to define number of integration sections to be used in connection with wave load calculations Example 1 Wave_Int 4 1001 1002 1003 Means that beam elements 1001 1002 and 1003 use 4 integration points For the other
133. nal loads Note that the NODEDISP data are given priority above the conventional boundary conditions both free and fixed dofs may become prescribed USFOS 2010 01 01 USFOS USER S MANUAL 6 3 132 Input Description USFOS Control Parameters NODEVELO case Node_ID dof_code Values Parameter Description Default _case Load Case number for the prescribed velocity which is referred to on the LOADHIST record Node_ID External node number dof_code Integer number defining the prescribed degrees of freedom The dof s are specified from 1 through 6 in global coordinates 1 velocity component in global X direction etc see under NODEDISP Values Reference values for the prescribed velocity components 0 0 zero defined fixed dof NOTE Values should only be specified for the dof s defined in the dof_code This record defines prescribed velocity The dof_code is formed by the dof numbers for all prescribed degrees of freedom at the node written consecutively without blanks See NODEDISP for example of use Internally in USFOS the prescribed velocity history NODEVELO TIMEHIST defines the history is integrated to prescribed displacement history and applied as prescribed displacement The generated history is identified on the out file with ID Original_ID poy Velocity history Displacement history Velocity gt Displacement Note that the values are reference values the total velocity will be
134. nd contains the correspondence between external user defined element numbers and internal element numbering in USFOS This record consists of two lines and has to be repeated once for every element in the structure USFOS 2010 01 01 USFOS USER S MANUAL 6 4 5 Input Description SESAM Structural file format GELREF1 matno dummy dummy dummy dummy dummy dummy eccno transno eccno 2 eccno 3 eccno 4 Parameter Description Default elno Internal element number matno Material number geono Cross sectional geometry number Refers to record GBEAMG GIORH GBOX GPIPE or GELTH Eccentricity vector reference number Refers to GECCEN gt 0 eccentricity reference number 0 no eccentriticy specified 1 eccentricity reference numbers for all nodes are specified in line 4 of this record transno Reference number of local element coordinate system record GUNIVEC or of local nodal coordinate system BNTRCOS in case of spring to ground or super element ref AMATRIX eccno 1 Eccentricity vector reference number of node 1 Refers to record GECCEN eccno 2 Eccentricity vector reference number of node 2 Refers to record GECCEN This record contains references to element data This record consists of three or four lines depending on definition of nodal eccentricities If the eccentricities at all element nodes are equal ECCNO 0 then line 4 of this record is omitted for those elements USFOS 2010 01 01 USFOS USER
135. nes 6 4 23 6 4 9 Nodes with point Masses 00 0 0 cee ennnen a a a 6 4 24 6 4 10 Nodes with inital CONdItIONS 0 eee eeeeeeeeeeeeeeseecseecsaeceaeceseesseesseeeseeseeeseneesaes 6 4 25 6 4 11 Super element definition sneren a eiia aesir ae 6 4 26 6 5 UFO Structural File Format n oerrenio rento ane e EE ENEE A A E eaen 6 5 1 6 5 1 A alysis identification neoc ieee ieren renate ii eraieeaeh 6 5 4 6 5 2 Nodal Dafarn rosan oeiee e a E R aga EEE as E A AT 6 5 4 6 5 3 Elem nt Data e o Ta EEE A VET a ne ae 6 5 9 6 5 4 Cross Section Dataene aati ia sieht ane SEa EEE EE Ea EE SEE 6 5 22 6 5 5 Material Dataene iiei E ETENE E EE EEE 6 5 26 6 5 6 Mise Data seere reegen oe a r E e aAa aa eenaa Ea 6 5 32 6 5 7 UFQ Examples e mne eo EE sgt a R N e N aa 6 5 34 USFOS 2010 01 01 USFOS USER S MANUAL 6 1 1 Input Description USFOS Control Parameters 6 INPUT DESCRIPTION USFOS reads input from symbolic files The user may give all input on one file or distribute the data on two or three files All control parameters are specified in the Analysis Control File Structure data can also be read from this file but is usually given on one or two separate files The specific content of these files is not important as long as all data are present For convenience these files are labelled Structure file and Load file cfr Figure 2 1 These files may be written with a text editor or generated by interactive preprocessor and load generation programs
136. no R B y Gr YFSW Cs Parameter Description Default matno Material number R Total radius of spudcan B Apex angle deg yY Effective unit weight soil Friction angle soil deg c Cohesion soil v Poisson number soil Vore Vertical preload Gy Shear module vertical Gu Shear module horizontal Gr Shear module rotational YFSW Yield Function switch 0 0 Yield function according to SNAME RP 1 Old Yield function SINTEF Geoteknikk Degree of associated flow apply to SNAME model only 1 0 Cs 1 0 Associated flow 2 0 Non uplift sliding This record describes the old format used to specify material properties for the nonlinear jackup foundation element 1 node element Only valid for Sand Kept for backward compatibility only the SPUDMAT record is recommended for new Models If the apex angle is 90 deg the preload is a dummy variable Local coordinate system is defined with the BNTRCOS card Element coordinat system is shown in the figure below This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 61 Input Description USFOS Control Parameters ID Nodex1 Nodex2 SoillID Pile Mat Pile Geo Local_coord Imper Parameter ID Nodex1 Nodex2 Soil ID Pile Mat Pile Geo Loc Coord Imper Description Default User defined number used to identify the Pile External user defined node number defining end 1 of the pile top External user defined node number defining end 2 of the
137. nts on bottom flange Elem ID Element ID of beam element s with box cross section With this record the user specifies the mesh density of beam element which will be replaced by an automatically generated shell element substructure Note that the nLength nSide nTop nBott parameters define the quadrilateral mesh and if triangular elements are used two elements are defined per quad as seen in the figure below nSide 5 Triangular shell element This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 91 Input Description USFOS Control Parameters MESHIPRO nLength nWeb nTop nBott Elem ID Elem ID2 Parameter Description Default nLength Number of shell elements in longitudinal direction nWeb Number of shell elements on the profile web nTop Number of shell elements on top flange nBott Number of shell elements on bottom flange Elem ID Element ID of beam element s with I cross section With this record the user specifies the mesh density of beam element which will be replaced by an automatically generated shell element substructure Note that the nLength nWeb nTop nBott parameters define the quadrilateral mesh and if triangular elements are used two elements are defined per quad as seen in the figure below Tnangular shell element This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 92 Input Description USFOS Control Parameters 6 3 15 Miscellane
138. numbers Group The specified Id s are group numbers Ild_List One or several id s separated by space With this record the user may define the internal fluid of one or more cylindrical elements The elements are specified either directly element list or in directly using material geometry or group references The fillratio 0 1 is specified using a time history where the time history function value is directly the instantaneous fill ratio The free surface calculation no sloshing effects detects instabilites and a new equilibrium position is found automatically The model which requires that panel buoyancy is defined for the element s is rather time consuming and it is recommended to us this option on special selected elements only buoyancy tanks etc T gy 2 Empty Cylinder Cylinder is partly filled Becomes unstable free surface and finds a new equilibrium position Example 1 Dens FillTyp HistID ListTyp MatID IntFluid 900 TimeDep 11 Mat 1 y ID Type Tl T2 Factor TimeHist 11 S Curv 20 30 0 2 All elements referring to materials 1 will have an internal fluid with density 900 kg m The cylinder is filled to 20 0 2 between time t 20s to t 30s See TimeHist 11 As the figures describe the cylinder will first move vertical without tilting but becomes unstable and tilts to a new equilibrium position NOTE This option requires the Panel buoyancy formulation on the actual elements This record may b
139. ocessing task Example BuckMode 5 0 1 An eigen value analysis automatically will be initiated prior to the ordinary collapse analysis and the 5 th eigenmode is scaled by 0 1 and added to the initial nodal coordinates The stress free structural shape is shown in the figure below to the left while the final collapse mode is shown to the right Initial Mode This record is given only once GROUTED GroutMat ListType List Parameter Description Default GroutMat Material ID defining the Grout material parameters see MATERIAL ListType Definition Type Element Element ID list List Material Material ID list Geometry Geometry ID list List of actual ID s This record is used to specify elements with grout Example 1 Grouted 1020 Geom 27304 27305 27306 All elements referring to cross section must be pipes 27304 27305 or 27306 will be filled with grout wit material properties defined by material ID 1020 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 45 Input Description USFOS Control Parameters ElmTrans Type Node ListType ID s Unit Type Node Reference Type GlobNode Node refers to Node ID LocNode Node refers to the element s local node end Node Id of node or local element node see above ListType Keyword for interpreting of the succeeding ID list elem Element ID s are specified Mat Material ID
140. odex External node number for the actual tubular joint elnob1 External element number for overlapping brace no 1 elnob2 External element number for overlapping brace no 2 This record defines overlapping braces at the tubular joints where shell effects are specified ELNOB2 Real structure Users beam model Beam eccentric connected to the surface node One extra surface node Beam eccentric connected to the surface node Model with local flexibility and overlapping included USFOS 2010 01 01 USFOS USER S MANUAL 6 3 49 Input Description USFOS Control Parameters CHJOINT nodex elnox1 elnox2 geono _ irule Parameter Description Default nodex External node number referring to the joint where shell effects should be considered elnox1 External element number defining one of the two elements connected to the node elnox2 External element number defining the second CHORD element geono Geometry reference number defining the diameter and thickness of the chord at the joint canned joint If omitted or equal to 0 the data for elnox1 is used irule Capacity rule switch irule 1 API no more data required irule 2 DoE no more data required irule 3 User defined capacity and surface definition more data required see next pages irule MSL MSL non linear joint characteristics see next pages Irule 101 User defined Joint Springs more data required see next pages With this record the capac
141. oint brace1 User defined element number of first brace element axial Axial capacity brace chord connection torsion Torsion capacity brace chord connection Mipb In plane bending capacity brace chord connection Mopb Out of plane bending capacity brace chord connection Data for all braces connected to the joint are required With this record the capacity of each brace chord connection at the tubular joint will be checked according to the specified rule This check will impose restrictions on the load transfer through each brace chord connection at the specified joint When the USER defined capacity is used rule 3 the following surface definition is applied USFOS 2010 01 01 USFOS USER S MANUAL 6 3 52 Input Description USFOS Control Parameters CHJOINT nodex elnox1 elnox2 geono CapRule CapLevel Q SafetyCoeff Parameter Description Default nodex External node number referring to the joint where joint capacity and non linear joint behaviour should be considered elnox1 External element number defining one of the two CHORD elements connected to the node elnox2 External element number defining the second CHORD element geono Geometry reference number defining the diameter and thickness of the chord at the joint canned joint If omitted or equal to 0 the data for elnox1 is used CapRule Capacity rule MSL MSL non linear joint characteristics CapLevel Capacity level or capacity multiplier mean
142. op Temperature specification option 1 Mean element temperature specified 2 Different temperature specified at each node Internal element number Number of element nodes nnod 2 Mean element temperature top 1 or temperature at local node 1 top 2 Temperature at local node 2 top 2 This record contains specification of temperature increments without gradients over the element cross section This record consists of two or three lines USFOS 2010 01 01 USFOS USER S MANUAL 6 4 22 Input Description SESAM Structural file format BEUSLO llc lotyp dummy dummy elno nnod dummy dummy rload1 rload2 rload3 rload4 Parameter Description Default IIc Load case number lotyp Load type only load type 1 normal pressure non conservative load is available elno Internal element number nnod Number of nodes of the element rload1 Intensity of pressure at local node 1 Positive pressure is directed along local element z axis rload2 Intensity of pressure at local node 2 Positive pressure is directed along local element z axis This record defines element surface loads The record may be repeated for each element This record consists of 3 lines USFOS 2010 01 01 USFOS USER S MANUAL Input Description SESAM Structural file format 6 4 23 6 4 8 Hydrodynamic Added Mass BEMASS1 dummy elno dummy np c 1 c 2 Sots c np am 1 1 am 2 1 am 3 1 am 1 2 __ am 3 np Parameter Description De
143. or Type 2 Data Pile ID dof_code Integer number defining the prescribed degrees of freedom The dof s are specified from 1 through 6 in global coordinates 1 Displacement in global X direction 2 Displacement in global Y direction 3 Displacement in global Z direction Values Reference values for the prescribed displacements 0 0 zero defined fixed dof NOTE Values should only be specified for the dof s defined in the dof_code This record defines prescribed accelerations in the soil The dof_code is formed by the dof numbers for all prescribed degrees of freedom at the soil nodes written consecutively without blanks Example 1 3 C Type z Top z_Bott DOF Vall Val2 SOII SOII 1 20 0 50 0 12 Layer 2 1 50 0 100 0 5 P Layer 3 L SOTII 3 al 0 0 20 0 12 5 Layer 1 3 3 See also examples on www USFOS com and release notes for USFOS version 8 5 Note that the values are reference values if input is given in time history format the total acceleration will be a multiple of this value and the instantaneous value of the time history assigned through the LOADHIST record If the displacement history defined in the referred TIMEHIST is the absolute displacements the reference values should be set 1 0 For movement in directions different from the global axes the reference values are used to define the actual directions see example 2 This record could be repeated USFOS 2010 01 01 US
144. ording to the nonlinear spring material number NL_ship MISOPL data lt 0 No spring is inserted between the mass and the structure Time Time for ship mass rebound If omitted the ship mass is detatched from the structure when the inserted spring force changes from compression to tension NOTE Mandatory if NL_ship lt 0 This record is used to define ship impact load and is given once The Ship speed and mass should be specified in Sl units kg m and s This record is not available together with BIMPACT and MSHIP The option is available together with Dynamic Analysis only USFOS 2010 01 01 USFOS USER S MANUAL 6 3 84 Input Description USFOS Control Parameters 6 3 13 External pressure Effects EXTPRES elnox1 elnox2 elnox3 Parameter Description Default elnox lt i gt External element number i This record is used to identify tubular beam elements with external hydrostatic pressure On basis of the element position the hydrostatic pressure is calculated and imposed on the element at the initiation of the analysis i e prior to imposing loads specified in the CUSFOS CICYFIS or CDYNAMIC records The external pressure option affects the plastic axial and moment capacities of the tubular cross section Note Sea surface level must be specified by use of the SURFLEV record plastic capacity in air plastic capacity submerged USFOS 2010 01 01 USFOS USER S MANUAL 6 3 85 Input Descri
145. ormal steel beam with no grout For tubular members with internal grout the material is referred to using the command Grouted lt MatID gt Elem Elem1 Elem2 Grouted lt MatID gt Mat Mat1 Mat2 Grouted lt MatID gt Geo Geol Geo2 Note It is recommended to model grouted members with two beam elements use for example the REFINE command Modeling with one beam element may give a discontinuous force bending moment interaction history at member mid span when a plastic hinge is introduced This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 32 Input Description UFO Structural file format 6 5 6 Misc Data GRAVITY Load Case Parameter Description Load Case Load Case Number AX Acceleration field in global X direction Ay Acceleration field in global Y direction Az Acceleration field in global Z direction NOTE Zeros at the end of the record may be omitted and will be treated as zero acceleration With this record the user defines a Translation Accleration Field Example 1 GRAVITY 1 0 0 0 0 9 81 defines an acceleration field of 9 81 in negative Z direction The load case number is 1 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 33 Input Description UFO Structural file format ACCFIELD Load Case Type Opt aRx aRy Parameter Description Load Case Load Case Number Type Actual Field Type Rot Actual Field is a Rotation
146. ous ACTIVELM type l comb elnox1 elnox2 time Parameter Description Default type Activating type 1 l comb Static analysis The elements are activated at the specified time loadcomb Dynamic analysis The elements are activiated at the specified time elnoxi External user defined element numbers of elements to be activated The user may use this record to control the activation of elements that is when one or more elements should contribute to the system stiffness Example 1 Static analysis i Typ LComb Elm_ID ACTIVELM 1 5 1001 1002 means that elements 1001 and 1002 are activated at loadcombination 5 Example 2 Dynamic analysis i Typ Time Elm_ID ACTIVELM 1 25 1001 1002 means that elements 1001 and 1002 are activated at time 25 seconds This record may be repeated TOTL2INC Ic start Ic end Parameter Description Default Ic start First load case of the total_load Ic end Last load case of the total_load With this record the user defined total load vectors are transformed to incremental load vectors Load cases with loadcase number less than c start or greater then c end are not changed Nodal loads element loads and temperature loads are processed Note The loadcases must be given successively within the defined loadcase interval This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 93 Input Description USFOS Control Parameters COROLOAD Case
147. p Mass xdir ydir dir NL_ship Time Multiple impact Switch MULT_IMP External pressure Effects Page 6 3 84 External hydrostatic pressure EXTPRES elnox elnox2 elnox3 Sea surface elevation SURFLEV hisurf losurf density gravity Super element Sub structure Modelling Page 6 3 86 Super elements SUPERELM Elem ID nNodes Nodex_1 Nodex_2 Nodex_n Material Sub structure analysis SUBSTRU Matno Shell sub structure generation SUBSHELL Elem_ID Shell sub structure load SSH_LOAD Lcase Elem ID Fx Fy Fz Typ Xc Phi_c ExtentX ExtentArc Define mesh density for pipe MESHPIPE length nCirc ElemID s Define mesh density for box MESHBOX length nSide nTop nBott ElemID s Define mesh density for I H profile MESHIPRO nlength nWeb nTop nBott ElemID s Miscellaneous Page 6 3 92 Mating analysis activation of members ACTIVELM ListType Lease elnoxl elnox2 Total load gt Incr load preprocessing TOTL2INC lc start Ic end Distributed load in local element system COROLOAD I Case Elem_1 Elem_2 Sliding Interface contact search SI Type nMst nSlv MstID s Slv ID s Make non linear springs invisible INVISIBLE ListType Id_1 Id_2 Element Group definition GROUPDEF GroupID ListType List Add node s to a given group GROUPNOD GroupID Nod_1 Nod_2 Nod__n Redefine element material CHG_MAT MatID Typ ID list Redefine boundary conditions CHG_BOUN ix iy iz irx iry irz Typ ID list Special Switches SWITCHES KeyWord SubKey Value luSFos 2010 01 0
148. pe NodeID ElemID LocNMass Node 101 22 NodeID x Y Z rx rY xrZ NodeMass 101 0 0 O 184 0 0 The rotation mass with value 10 000 kgm will refer to element 22 s local system i e the mass becomes a local torsion mass of element 22 This option is typically used in connection with modelling of rotating structures where the properties should follow the structure s large displacements and rotations 101 102 100 21 22 This record could be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 8 Input Description UFO Structural file format WEIGHT KeyWord ListType ID_List Parameter Description KeyWord Actual keywords Concentrated Specification of concentrated mass History Specification of time history to control mass Value If Concentrated Value is actual mass kg If History Value is actual time history ID controlling mass ListType How to defne actual nodes At present only Node is available ID_List Node ID s to be given actual mass history With this record the user defines a concentrated mass assigned to one or more nodes which could vary as a function of time Example KeyWord Value ListTyp IDs Weight Concentrated 5000 Node 1 3 k KeyWord HistID ListTyp IDs Weight History 2 Node 1 Weight History 3 Node 3 defines a concentraded mass of 5000 kg in nodes 1 and 3 The masses are controlled in time by individual time histories Node 1 mass follows hi
149. ption USFOS Control Parameters SURFLEV __hisurf losurf density gravity Parameter Description Default hisurf Sea surface level defined by the global reference system z coordinate losurf Sea bottom level defined by the global reference system z coordinate density Fluid density use consistent units gravity Acceleration of gravity in global z direction use consistent units This record is used to identify the sea surface level and sea bottom position relative to the structure as well as properties of the surrounding fluid NOTE This record does not define the data required by the wave load routines To be used together with the EXTPRES option only USFOS 2010 01 01 USFOS USER S MANUAL 6 3 86 Input Description USFOS Control Parameters 6 3 14 Super element Sub structure Modelling SUPERELM Elem ID nNodes Nodex_1 Nodex_2 Nodex_n Material Parameter Description Default Elem ID Element ID of the super element nNodes Number of Element Super Nodes nodes to be connected to the global frame model Nodex_1 User defined node ID in the global frame model to which super node 1 is connected to Nodex_2 User defined node ID in the global frame model to which super node 2 is connected to Nodex_n User defined node ID in the global frame model to which the last super node is connected to Material Material ID number referring to the MISOIEP record defining the nonlinear material properties of the superelemen
150. r 5 Y rotation degree of freedom is damped Zmoment or 6 Z rotation degree of freedom is damped Damping Characteristics given in consistent units Damper force Cdamp translation speed Damper moment Cdamp angular velocity List of 2 node Spring Element ID s NOTE If no elements are specified all springs are defined with the actual damping This record is used to define dashpot damping of spring elements to be used in connection with dynamic analysis Example 1 SPRIDAMP Axial 50000 10210 10220 10230 means that spring elements 10210 10220 and 10230 get axial damping of 50000 If the units are N and m the damping force Force N 50000 Axial Speed m s Example 2 SPRIDAMP Axial 50000 means that all spring elements get axial damping of 50000 Example 3 SPRIDAMP Axial 50000 SPRIDAMP Axial 30000 10210 10220 means that all spring elements get axial damping of 50000 except for elements 10210 and 10220 which get a damping of 30000 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 68 Input Description USFOS Control Parameters APLSOIL ID Soil_ type Load_type Data Parameter Description Default ID User defined number used to identify the API Soil Characteristics referred to on the SOILCHAR record Soil_type Soil Type SoftClay Soft Clay StifClay Stiff Clay Sand Sand Load_type Load type Static Static Loading monotonic Cyclic Cyclic Loading s
151. rFrac Parameters Geometry The ID_List contains Geometry ID s and all beam elements referring to the actual Geometry ID s get the actual UserFrac Parameters Crit_Type Type of criterion to be used Cut Element is just removed Time Element is removed at given time Lcomb Element is removed at the specified loadcomb loadlevel Util Element is removed if exceeding specified utilization Strain Element is removed if the estimated tensile strain exceeds the specified limit Criterion Criterion for element removal Type Criterion Description Cut N a Time time Time for element removal Lcomb LComb Level Loadcomb and Loadlevel Util i Util Member utilization f ex 1 05 Strain Strain Strain level fex0 15 ID_List List of ID s for which the UserFrac should be applied The Id s are interpreted as defined in ListType Elem Mat or Geo This record may be used to force one element to be fractured The fracture will become active the step after the step detected the fracture and the forces in the specified element will be removed The element will not contribute to the global stiffness in the succeedent steps Example1 ListTyp CritTyp Crit ID_List UserFrac Elem Strain 0 15 1001 1002 1003 Will apply a strain fracture criterion 15 on elements 1001 1002 and 1003 Example2 ListTyp CritTyp Crit ID_List UserFrac Geo Strain 0 15 51012 51015 Will apply a strain fracture cri
152. ransitation is performed see record CPROPAR USFOS 2010 01 01 USFOS USER S MANUAL 6 3 34 Input Description USFOS Control Parameters matno refx refy refz refrx refry refrz Parameter Description Default matno Material number refx Properties in local x direction is defined by material with ID number refx refy refrz Similar to refx for the other degrees of freedom This record is used to specify material properties for the nonlinear spring element both 1 node and 2 node This record may be repeated Properties in the 6 DOF s are specified by referring to other material input SESAM record MISOPL or UFO records HYPELAST and ELPLCURV Material numbers equal to zero means that the spring has no stiffness in the actual degrees of freedom If element type no 18 spring to ground refers to a MREF material the element will be handled by USFOS as a 1 node nonlinear spring to ground If element type no 15 2 node beam refers to a MREF material the element will be handled by USFOS as a 2 node nonlinear spring USFOS 2010 01 01 USFOS USER S MANUAL 6 3 35 Input Description USFOS Control Parameters MPLASMON matno c1 at c2 a2 c3 a3 c4 a4 c5 a5 c6 a6 Parameter Description Default matno Material reference number c1 Hardening parameter for x force 20 10 al Elasto plastic transition parameter for x force 0 25 c2 Hardening parameter for y force 2 0 10 a2 Elasto plastic transition parameter for y force 0 25
153. ree fix4 1 fixed fix5 4 retained degree of freedom fix6 fix1 translation in x direction fix2 translation in y direction fix3 translation in z direction fix4 rotation about x axis fix5 rotation about y axis fix6 rotation about z axis This record specified the boundary condition of each relevant degree of freedom Nodes with fix 4 are called super nodes and may only be specified in a substructure analysis refer input record SUBSTRU This record consists of two lines USFOS 2010 01 01 USFOS USER S MANUAL 6 4 15 Input Description SESAM Structural file format BNTRCOS transno t41 toy t31 tre too t32 tis tos tag Parameter Description Default transno Transformation number referred to in GELREF1 t41 Nine direction cosines of the rotation transformation matrix The transformation matrix T describes the transformation defined by VLoc T lGlob where ioc refers to the local coordinate system and rgiop refers to the global coordinate system COS X Xe Cos X Yo cos XL Ze cos yL Xe cos yL Yo cos a Ze cos Z4 Xe cos Z4 Yo cos ZL Zc This record consists of three lines USFOS 2010 01 01 USFOS USER S MANUAL 6 4 16 Input Description SESAM Structural file format BELFIX fixno opt trano dummy fix1 fix2 fix3 fix4 fix5 fix6 Parameter Description Default fixno Fixation number FIXNO is referred to from GELREF1 opt opt 1 is mandatory either fully fixed or
154. referred to in a USFOS analysis This option replaces the old ccomb option which had limitation on number of cases and no individual scaling available Example v New Case OldCase Factor COMBLOAD 3 4 13 2 20 10 0 7 13 20755 Generates a new load case 3 as follows _case3 l_case4 1 3 _case3 2 0 _case10 0 7 _case13 0 55 The original loads case 4 3 10 and 13 are cleared after all combinations are processed NOTE This option should be used for basic loads only NodeLoad BeamLoad Pressure Gravity This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 11 Input Description USFOS Control Parameters CCOMB Icomb Idcs1 Idcs2 Idcs3 Parameter Description Default Icomb Load combination number Idcs1 First loadcase to enter the load combination Ides2 Second loadcase to enter the load combination Idcs3 Third loadcase to enter the load combination This record is used to combine input load cases into load combinations In nonlinear analyses the load responses may NOT be superposed Any superposition must apply to the loads themselves Sect 4 1 If no CCOMB records are given the program will use the input load case numbers However if this record is used once then all load specification will refer to load combination numbers and not to input load case numbers This record may be repeated Note Maximum 3 loadcases per load combination NOTE 2 This command should
155. repeated BANANA Offset Angle Parameter Description Offset Maximum offset divided by element length default 0 0015 Angle Orientation of offset Specified in degrees counter clockwise from the local element z axis default 0 NOTE If no parameters are defined all beam elements will get an initial out of straightness of 0 15 With this record the user defines the out of straightness of the beam elements NOTE For physical members divided into more than one beam element the coordinates of the nodes along the physical member are moved according to the specified offset and orientation The updated coordinates are printed on the out file This record is given once USFOS 2010 01 01 USFOS USER S MANUAL 6 5 22 Input Description UFO Structural file format 6 5 4 Cross Section Data PIPE Geom ID Do T Shear Y Shear_Z Dp Parameter Description Geom ID User defined external geometry number Do Outer Diameter of the pipe T Wall thickness of the pipe Shear_Y Shear area factor of Y axis Shear area Shear_Y Calculated shear area Shear_Z Shear area factor of Z axis Shear area Shear_Z Calculated shear area If Shear_Y and Shear_Z are omitted or equal to zero Shear_Z and Shear_Z are both set equal to 1 0 D gt Outer Diameter at end 2 of element If Omitted end 2 gets same diameter as end 1 With this record the user defines a pipe cross section to be used in the finite element analysis
156. rinti 2 rint2 2 Parameter Description Default IIc Load case number OPT Option for reference 11 12 OPT 0 L1 L2 refers to dist from the ends of the flex part of the element OPT 1 L1 L2 refers to distance from the nodes disregarding eccs Internal element number Distance along the element from node 1 to the position where the line load starts acting Distance along the element from node 2 to the position where the line load ends Number of specified intensities edof 6 Load intensities at local node 1 in global x y and z directions Load intensities at local node 2 in global x y and z directions This record defines element line loads The record may be repeated for each element with different values for 7 and 2 This record consists of four lines Note The load is handled as conservative loading by USFOS ririri USFOS 2010 01 01 USFOS USER S MANUAL 6 4 19 Input Description SESAM Structural file format BGRAV llc dummy dummy dummy gx gy gz Parameter Description Default IIc Load case number gx Component of gravity vector global x y and z directions gy gz This record defines gravitational loads This record consists of two lines Note The load is handled as conservative loading by USFOS BNWALO lic nodeno dummy ndof rload1 rload2 rload3 rload5 rload6 Parameter Description Default llc Load case number nodeno Internal node number ndof Number of degrees of freedom ndof
157. rties by referring to user defined temperature reduction curves USFOS 2010 01 01 USFOS USER S MANUAL 6 3 78 Input Description USFOS Control Parameters LCASETIM L Case Time Parameter Description Default L_Case Actual load case number to be connected to a time Time Time corresponding to completed loadcase With this record the user may connect a time to each loadcase This is f inst used in connection with fire analyses where the different loadcases defined through BELTEMP correspond to a time duration of the fire This record may be repeated FIRECHK LCase cuk Yieldrep Eremo Tempum Parameter Description Default LCase cuk Actual load case to check Yieldpep Lowest accepted Yield reduction factor Erep Lowest accepted E Mod reduction factor Tempum Highest accepted Element temperature With this record the user may perform a normal static analysis but with the temperature at a given temperature load step The material properties fore every element are adjusted according to the actual temperature If the Yield or E mod or Temp criterion are exceeded for an element the element is removed becomes nonstru A positive LCase number means that the check is performed for the actual load case state A negative LCase means all time high temperature for each element up to the actual load case This record is given once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 79 Input De
158. s JOINTGAP Gap NodelD Brace1 Brace2 Parameter Description Default Gap Actual Gap specified in current length unit NodelD Actual Joint CHJOINT must be specified for this joint Brace_i The actual gap should be applied to the Braces Elem ID s specified NOTE 1 If no node is specified all joints defined get the actual gap NOTE 2 If no braces are specified all braces get the actual gap With this record the user may override the gaps between braces which are computed based on the structural model member coordinates and offsets This is a useful option if the structural model does not describe correct gaps f ex a model without member eccentricities offsets This record may be repeated Gap NodID Example 1 JOINTGAP 0 050 This will force a gap 0 050 to be used in all relevant capacity calculations for all joints with CHJOINT applied does not influence T Y capacities Gap NodID Example 2 JOINTGAP JOINTGAP JOINTGAP JOINTGAP This will force a gap 0 050 to be used in all relevant capacity calculations for all joints except for joints 1010 2010 and 3010 which will use a gap of 0 070 Gap NodID Brace1 Brace2 Brace3 Example 3 JOINTGAP 0 050 JOINTGAP 0 070 1010 20100 20101 20102 This will force a gap 0 050 to be used in all relevant capacity calculations for all joints except for joint 1070 where the braces 20100 20101 and 20102 which will use a gap of 0 070 The other braces connecte
159. s are group numbers Ild_List One or several id s separated by space With this record the user may override the material referred to on the structural file In the analysis the specified material is used for all listed elements The elements are listed either directly element list or in directly using geometry or group references Example 1 Chg_Mat 210420 Elem 101 102 103 The command implies that elements 101 102 103 will used material property 210420 in the analysis independent on what materials the elements are referred to on the structural file Example 2 Chg_Mat 210420 Geo 52012 55013 60015 The command implies that all elements referring to one of the geometries 52012 55013 60015 will used material property 210420 in the analysis independent on what materials the elements are referred to on the structural file This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 98 Input Description USFOS Control Parameters Chg_Boun ixiyizirxiryirz Type Id_List Parameter Description Default ix iy Boundary cond code for the 6 dofs 0 Free 1 Fixed Type Data type used to specify the node s Node The specified Id s are node numbers All All nodes get the actual boundary code Id_List One or several id s separated by space With this record the user may override the boundary conditions defined on the structural file In the analysis the specified boundary codes are applied to all liste
160. scription USFOS Control Parameters 6 3 12 Ship Impact analysis BIMPACT _ldcs elnox elpos energy extent xdir ydir zdir ship Parameter Description Default Idcs Load case number elnox External user defined element number elpos Position of impact 1 Impact on member end 1 2 Impact on member end 2 energy Impact energy energy unit yield stress unit length unit If oy in MN m and length in m gt give energy in MNm extent Extension of the impact area along the beam length given in the actual length unit xdir ydir Direction of the impact referred to global coordinates zdir ship Reference number for local ship indentation characteristics record MSHIP 0 All energy is absorbed by the structure gt 0 Local indentation and energy absorbtion in the ship is calculated according ship material number ship MSHIP data USFOS 2010 01 01 USFOS USER S MANUAL 6 3 80 Input Description USFOS Control Parameters This record is used to define ship impact load and may be repeated The impact energy must be specified in units consistent to external loads and nodal deformations W F u When the total impact energy has been dissipated the impact load will be unloaded in a separate program defined load case Note that both excessive member straining fracture and joint failure must be evaluated in connection with the impact simulation These checks can be included in the USFOS analysis records CHJOINT
161. separated by space This record is an extended version of the original FLOODED command specified above Example 1 Flooded Group 1 5 6 All elements in groups setes 1 5 or 6 will become flooded NOTE The last definitions will override previous definitions if same element is defined more than once This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 110 Input Description USFOS Control Parameters MaxWave Criterion dT EndT Write Parameter Description Default Criterion Criterion used to identify worst wave phase of the actual wave Baseshear Base Shear is used OverTurn Overturning moment is used dT EndT The wave defined by the WAVEDATA record is stepped through with a time increment of dT up to time EndT The worst phase detected in the specified interval is used Write option Write The wave forces are written to file noWrite No writing With this record the the user may us USFOS to identify the worst wave phase to be used in a static pushover analysis The load_case no of the specified WAVEDATA record may be referred to from the CUSFOS or CICYFOS record NOTE only one WAVEDATA loadcase is possible to spefiy using this option Example 1 Typ dT EndT option MaxWave BaseShear 0 5 16 noWrite f case Typ H Per Dir Phase Surflev Depth WaveData 2 Stoke 25 0 16 45 0 0 0 100 CUSFOS 10 10 1 0 1 0 i Icomb Ifact mxld nstep minstep 1 0 5 1 0 10 0 010 DeadWeight 2 0 1 5 0
162. sis on the given damping ratios and associated frequencies Example 1 d1 d2 fq1 fq2 DampRatio 0 02 0 01 0 1 10 means 2 damping at 0 1 Hz T 10s and 1 damping at 10 Hz Constant damping ratios during the analysis Example 2 d1 d2 fq1 fq2 Hist DampRatio 0 01 0 01 0 1 10 101 ID Typ t1 fil t2 TimeHist 101 points 0 0 1 0 10 1 0 11 0 5 0 12 0 1 0 100 0 1 0 means 1 damping at 0 1 Hz T 10s and 1 damping at 10 Hz Damping ratios are scaled according to time history with id 101 which means increased damping between time 10 and time 12 Peak damping is 5 at time 11s NOTE This record is an extended alternative to the RAYLDAMP input and override data specified under the RAYLDAMP input This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 20 Input Description USFOS Control Parameters DampData Damp_ID Type Data Parameter Description Default Damp_ID ID to be referred to from ELEMDAMP Type Kind of Damping data Actual Types Rayl_All Common data for all 6 dofs Data alpha1 amp alpha2 Rayl_Ind Individual data for the dofs Data alpha1 amp alpha2 Dof1 alpha1 amp alpha2 Dof6 Alfa1 and 2 Rayleigh Coefficients see under RaylDamp for more info With this record the the user may specify general damping to be be referred to from individual elements used in a Dynamic Analysis Example 1 DampID DampType alphat alpha2 DampData 10010 Rayl_All 0 0 3 0E 4 DampD
163. spring representing the soil is inserted automatically Confer record SPRI_LMOD below for selecting spring model to be used Calculation of discrete spring Force Displacement Characteristics representing the pile resistance for a given thickness of a soil layer is performed according to the following formulas Fine D ile P Y Force Thickness p L ac D5 Fine D ile T Z Force Thickness T fac ref Dpite D ref All Displacement L Soil deformation Q Z Force F Q This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 66 Input Description USFOS Control Parameters SOILCHAR ID Type Z Mud D ref F_fac L fac Z top Z_bott Soil_ID Z top Z_bott Soil_ID Z top Z_bott Soil_ID Parameter Description Default ID User defined number used to identify the Soil Characteristics referred to on the PILE record Soil Data Type 2 Soil is defined through soil parameters f inst API_SOIL Z_coordinate of Mudline The soil data are given relative to mudline Reference Diameter Soil data is generated for this diameter D_ref does not have any influence on the results but the generated curves will be printed for this diameter Scaling factor for the force unit Soil curves are always generated using SI units N and m If f inst the force unit is MN F_fac 10 Scaling factor for the length unit Soil curves are always generated using
164. ss than 90 an effective radius is calculated based on the input Local coordinate system is defined with the BNTRCOS card Element coordinat system is shown in the figure below This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 59 Input Description USFOS Control Parameters SPUDMAT matno Type Vore Ret Demo As Gy Gu Gr Cuo a Suct Bfill Ca C C7 Parameter Description Default matno Material number Type Soil Type Clay Vore Vertical preload Reg Effective spudcan radius Dem Embedment depth As Spudcan laterally projected embedded area Gy Shear module vertical Gu Shear module horizontal Gr Shear module rotational v Poisson number soil Cuo Undrained cohesive shear strength at max bearing area soil a Adhesion factor 1 0 soft clay gt 0 5 stiff clay Suct Suction flag 1 Suction 0 No suction Bfill Backfill flag 1 Backfill 0 No backfill 0 Degree of associated flow 1 0 Cs 1 0 Associated flow 2 0 Non uplift sliding C Inner yield surface parameter 0 5 C7 Yield surface transition parameter 1 0 This record is used to specify material properties for the nonlinear jackup foundation element 1 node element Local coordinate system is defined with the BNTRCOS card Element coordinat system is shown in the figure below This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 60 Input Description USFOS Control Parameters mat
165. story no 2 while node 3 mass is changed accordintg to time history 3 See examples on www usfos com and release notes for USFOS 8 5 This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 9 Input Description UFO Structural file format 6 5 3 Element Data Elem ID Node1 Node2 Material Geom L_ Coor Ecc1 Ecc2 Parameter Description Elem ID User defined external element number Node1 Node 1 of the beam is connected to the user defined external node number Node2 Node 2 of the beam is connected to the user defined external node number Material User defined material number defining the material properties of the element Geom User defined geometry number defining the geometry of the element L_Coor User defined unit vector number defining the local coord system of the element If omitted a default local coordinate system will be used local zx plane is parallel with global zx plane except for vertical members which have the local zx plane parallel with the global xy plane Node 1 of the beam has an eccentricity defined by user defined Ecc1 Node 2 of the beam has an eccentricity defined by user defined Ecc2 NOTE Zeros at the end of the record may be omitted With this record the user defines a beam element to be used in the finite element analysis Example 1 BEAM 100200 100 200 1174 defines a beam element with ID 100200 connected to the two nodes with ID 100 and 200 Material with ID 1 d
166. t If material ref is omitted Material defined on the local superelement file is used With this record the user defines a superelement to be included in the frame model f inst a shell model of a tubular joint Not yet implemented For each substructure following USFOS prompt will appear Super Element no prefix The super element file with extension fem contains all necessary FEM data The super element data might be defined in any of the available file formats This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 87 Input Description USFOS Control Parameters SUBSTRU matno Parameter Description Default matno Material number for the super element stiffness matrix which is generated on the basis of the input substructures This record may be used to perform a substructure analysis in order to calculate the super element stiffness matrix by means of static condensation of the internal nodes for the structure in the geometry file The super element stiffness matrix which is identified by the material number matno specified by the user may the be input to a subsequent USFOS analysis The super element stiffness matrix is written to the print file according to the AMATRIX and ADMSTIFF record formats The element super nodes have to be specified on the BNBCD records The super element matrix is output in the global reference system SUBSHELL Elem ID Parameter Description Defau
167. t the stiffness matrix must be symmetric This record consists of minimum three lines USFOS 2010 01 01 USFOS USER S MANUAL 6 4 27 Input Description SESAM Structural file format AMDLOAD nfields matrref snodi IIc ndof rload1 rload2 rload3 rload4 rload5 rload6 Parameter Description Default nfields Number of data fields on this record including this matrref Reference number for this load vector record snodi Supernode sequence number of super element or internal node number of basic element IIc Load case number ndof Number of degrees of freedom ndof 6 rload1 Load in direction of the relevant degree of freedom rload2 rload1 load in x direction rload3 rload2 load in y direction rload4 rload3 load in z direction rload5 rload4 moment about x axis rload6 rload5 moment about y axis rload6 moment about z axis This record defines nodal loads for a basic element or reduced super element Each record consist of three lines and contains the load terms of one node for one load case The loads are refereed to the global coordinate system or to a local system if one is defined by record BNTRCOS and referred to in the GELREF1 record Note The load is handled as conservative loading by USFOS USFOS 2010 01 01 USFOS USER S MANUAL 6 4 28 Input Description SESAM Structural file format AMDSTIFF nfields matrref snodi coddof k11 k21 k41 ks key Koo see Parameter Description Default nfields Number of data fields
168. tabilized cyclic behaviour of pile during complete loading history Data Clay Soil type 1 and2 y pl Su 5 J TResF Q Lim where unit y Effective unit weight of soil N m pl pl 0 unplugged pl 1 plugged Su Soil undrained shear strength N m E50 Strain which occurs at 50 of maximum stress on laboratory undrained compression test J Experimental coefficient can be taken to 0 5 for Mexican Gulf sediments 0 25 otherwise TResF Tres TPeak ratio ref Sec G API RP2A 1993 Typical values 0 7 0 9 QpLim Limit of pile tip resistance Nim Sand Soil type 3 y pl 665 Ng Qp Lim where unit Yy Effective unit weight of soil Nim pl pl 0 unplugged pl 1 plugged 0 Angle of internal friction typical 10 45 Deg Pile soil interface friction typical 15 45 Deg Ng End bearing factor typical 8 50 QpLim Limit of pile tip resistance Nim This record is used to define the properties of the API Soil referred to on the SOILCHAR record This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 69 Input Description USFOS Control Parameters 6 3 10 Fracture Ductility Control CFRACT If CFRACT is specified all beam elements are checked for fracture plastic tension exceed a specified limit If CFRACT is not specified no fracture checking will be performed MFRACT records are not fracture check switch The fracture criteria of the materi
169. terion 15 on all elements referring to Geometry ID s 51012 and 51015 This command may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 71 Input Description USFOS Control Parameters 6 3 11 Fire Temperature Response Analysis BELTEMP llc tygrad tzgrad PfPcrack_ang Parameter Description Default llc Load case number External user defined element number Element mean temperature Temperature gradient in local y direction of beam section C per unit length Temperature gradient in local z direction of beam section C per unit length ZA PfPcrack_ang Maximum accepted plastic rotation of the beam element before the passive fire protection is assumed to be cracked damaged If the plastic rotation exceeds this limit the element is removed fractured This record contains specification of temperature increments with temperature gradients over the beam element cross section or mean temperature increments for the plate element Gradients are not given for the plate element This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 3 72 Input Description USFOS Control Parameters ELEMTEMP llic type Data_Set lel1 iel2 iel3 Parameter Description Default IIc Load case number type Definition of the Data_Set see below Data_Setl Actual temperature Data_Set see below lel1 iel2 External user defined element number s If no elements are specified all elements
170. th this record the user defines a diagonal spring to ground stiffness matrix to be used in the finite element analysis Example 1 SPRIDIAG 33 1 0E4 Defines a spring to ground stiffness identified by the ID 33 with stiffness 1 0E4 in global X direction The 5 omitted diagonal terms are all set equal to zero This record may be repeated SPRIFULL S41 S42 13 S44 Sis Sie Sa S22 S23 Sa S25 Sag Se2 Ses Sea Ses Ses Parameter Description Mat ID User defined external material number S11 See 36 terms of the linear 6x6 spring to ground stiffness matrix NOTE All 36 stiffness terms must be given With this record the user defines a full spring to ground stiffness matrix to be used in the finite element analysis This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 27 Input Description UFO Structural file format HYPELAST Mat ID P 3 Po z Ph dn Parameter Description Mat ID User defined external material number Py 54 Definition of the first point of the force displacement curve P2 52 Definition of the second point of the force displacement curve Pa Sn Definition of the last point of the force displacement curve NOTE Only points in 1 and 3 quadrant are legal and the first point defines the bottom left end of the curve Max 25 points available With this record the user defines a hyperelastic P 5 curve to be used in connection with definition of a nonlinear spring matrix Examp
171. to be referred to from the commend GROUTED Grout Grout material keyword E Elastic modulus for grout Yield Yield stress for grout Dens Grout density or equivalent density specific mass See note below TensFac Tension capacity factor Ne TensFac Noiastic stee 1 12 CompFac Compression capacity factor Na CompFac Npiasticgrout Nolastic steel_ 1 0 M Red Moment reduction factor Mp Mg M Red Mp Ms 0 lt M Red lt 1 1 0 l Red Moment of inertia reduction factor El El stee l Red El grout 1 0 ShearFa Shear capacity factor Qpiastic ShearFac Aty steei_ 1 0 c See Figure below for definitions Na CompFac Npiastic grout Nolastic steel 4 Steel A Grout was Composite Z 2 0 2 D x lt 0 D Mg M Rea Mp Ms F c steel 2 0 20 40 60 80 Moment M Plastic axial force bending moment interaction for grouted tube Density If the weight of grout is important an equivalent density may be defined such that the total mass of the grouted pipe is correct i e P Psteer Pgrout Agrout Asteel Agrout Enclosedl area of tube Normally only important if inertia effects are significant dynamic analysis 2010 01 01 USFOS USER S MANUAL 6 5 31 Input Description UFO Structural file format Otherwise grout density may be used Grout is an attribute to elements i e the elements are filled with grout no change in the normal input Commenting out the Grouted command gives the n
172. to the three nodes with ID 10 20 and 30 Material with ID 100 defines the material properties and geometry with ID 88 defines the thickness No eccentricities This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 14 Input Description UFO Structural file format SOLID8 Elem ID ni n2 n3 n4 n5 n6 n7 n8 mat Parameter Description Elem ID User defined external element number n1 n8 Node 1 8 of the solid element is connected to the user defined external nodes mat User defined material number defining the material properties of the element With this record the user defines a 8 node hexahedron solid element to be used in the finite element analysis NOTE Not implemented in USFOS This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL 6 5 15 Input Description UFO Structural file format BEAMLOAD Load Case Elem ID qx1 qyl qz1 qx2 qy2 qz2 Parameter Description Load Case Load Case Number Elem ID User defined external element number beam element qx qy qZ1 Intensity in X Y and Z direction at end 1 of the beam Global direction qx qy qZz2 Intensity in X Y and Z direction at end 2 of the beam Global direction If end 2 intensities are omitted end 1 intensities are used i e uniform distributed load NOTE Zeros atthe end of the record may be omitted and will be treated as zero load With this record the user defines a distributed beam elem
173. ts Current Blockage factor Density of internal fluid Marine Growth Thickness Marine Growth Density Switch for flooded no flooded override default Switch for use of direction dependent Cd Fill ratio 0 1 of member with internal fluid Wave Kinematics Reduction Coeff Definition of complexity level of buoyancy calculations override default override default override default override default Actual Parameter value Data type used to specify the element s Element Mat Geo Group The specified Id s are element numbers The specified Id s are material numbers The specified Id s are geometry numbers The specified Id s are group numbers One or several id s separated by space With this record the user defines various hydrodynamic parameters for elements Some of the parameters could be defined using alternative commands F ex Hyd_CdCm etc but parameters defined under HYDROPAR will override all previous definitions This record could be repeated USFOS 2010 01 01 USFOS USER S MANUAL Input Description USFOS Control Parameters 6 3 123 Below the HYDROPAR keywords are described in detail HYDROPAR Keyword HyDiam Cd Cm Cl BuDiam IntDiam Wavelnt CurrBlock FluiDens MarThick MgrDens FloodSW DirDepSW FillRatio WavekKRF BuoyLevel Keyword Description The hydrodynamic diameter is used in connection with drag and mass forces according to
174. ult max on off Max number of subsequent load steps with plastification elastic unloading of a single element This record impose restrictions on repeated plastification elastic unloading of single elements If an element unloads re plastifies in more than max on off subsequent load steps elastic unloading will be suppressed in the remaining steps The restriction is removed the first time the element goes through a load step without trying to unload The restriction is also removed on the first load step of each new load vector Sect 4 2 e g if the external load is reversed This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 31 Input Description USFOS Control Parameters CDYNPAR alpha beta gamma Parameter Description Default alpha Integration parameter controlling high frequency numerical damping 0 beta Newmark integration parameter 0 25 gamma Newmark integration parameter 0 50 To obtain high frequency numerical damping select alpha in the range 0 3 to 0 0 The accuracy in the integration of the equation of motion is maintained for this case by setting both beta and gamma negative USFOS will then automatically select the Newmark integration parameters to y 1 2 1 2a R 1 4 1 c 0 3 lt lt 0 0 This record may be used to specify numerical integration parameters for the time integration of the equation of motion according to the Hilber Hughes and Taylor alpha dissipation method
175. umber of degrees of freedom ndof 6 velo1 Initial velocity in first degree of freedom velo2 Initial velocity in second degree of freedom velo3 velo4 velo5 velo6 This record specifies the node initial velocities for use in dynamic analysis This record consists of three lines USFOS 2010 01 01 USFOS USER S MANUAL 6 4 26 Input Description SESAM Structural file format 6 4 11 Super element definition AMATRIX nfield matno dummy nnod nsub dummy dummy dummy matrtyp matrref matrform dummy matrtyp matrref matrform dummy Parameter Description Default nfield Number of data fields on this record including this and embedded bland fields matno Material number reference number for this AMATRIX record specified on the GELREF1 record nnod Number of nodes on this element must correspond to specification on GELMNT1 record nsub Number of data fields in each sub record 4 matrtyp Matrix vector type indicator 1 stiffness matrix 4 load vector matrref Matrix reference no pointing to the reference matrref on the corresponding ADMSTIFF or AMDLOAD records matrform 0 Element vectors are stored load 1 Element matrix is symmetric and only upper triangle is stored For sub matrices on the diagonal all terms are stored and the diagonal sub matrices must be symmetric This record specifies the stiffness properties and loads for a premade reduced super element The element may have any number of nodes bu
176. uracy of the equation solver Sect 4 6 1 0E 20 gamstp Accepted value for overshooting the yield surface Sect 4 2 2 0 10 ifunc FEM beam shape function Sect 3 1 2 1 Sine cosine shape functions 3 3rd degree polynomials 2 3rd degree polynomials used when P lt Peuter pereul Sine cosine functions used when P gt Peuier pereul pereul Level of transition from 3rd degree plonomial shape function to sine cosine shape function Specified as a factor of the Euler buckling load Sect 3 1 ktrmax Max number recalculations of one load step due to element unloading Sect 4 1 dentsw Formulation of dented tubes and local buckling Sect 3 4 0 Only initially perfect cross section included 1 Local damages and dent growth included for tubes Local buckling of initially perfect rectangular and tube cross section included Elastic spring back is introduced when the current Stiffness Parameter exceeds cmax Sect 4 2 1 ifysw Parameter for elasto plastic transition 0 Elasto plastic transition performed 1 Elasto plastic transition not performed detersw Determinant criterion for identification of load limit points or bifurcation points 0 No determinant check 1 Determinant criterion active Load increment is reversed when the determinant changes sign This record may be used to change default program parameters This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 27 Input Description USFOS Control Parameters
177. use mean value joint capacities char use characteristic joint capacities fcrack use the first crack curve scalfact joint capacities are set to mean value capacities multiplied by scalfact where scalfact isa positive real number This option is only available with the MSL joint formulation Q Safety The Q factor for joint capacities includes a safety factor or partial Coeff safety coefficient in the chord stress utilisation factor With this record the capacity of each brace chord connection at the tubular joint will be checked according to a selected joint capacity equation This check will impose restrictions on the load transfer through each brace chord connection at the specified joint and the non linear joint characteristics will be included in the USFOS analysis Extra elements will be introduced in the FE model and the behaviour of these elements assigned according to the selected joint capacity rule or specified joint capacity and the FE formulation selected for the joint elements The joint capacity rule or joint capacity is specified by the CHJOINT record s The FE formulation for the joint elements is selected by the JNT_FORM record Note that use of the MSL formulation is confidential under the contract of the MSL JIP project Non linear joint modelling for Access to this formulation is limited to participants of the MSL JIP project their affiliated companies other p
178. with same material number Note For the case when all elements connected to a node fractures numerical problems will occur in the solution algorithm USFOS 2010 01 01 USFOS USER S MANUAL 6 3 74 Input Description USFOS Control Parameters STEELTDEP Curve no Matno 1 Mat no 2 Parameter Description Default Curve no Actual Steel Reduction Curve No see below Mat no Material numbers referring to MISOIEP to be defined temperature dependent If no material numbers are specified all materials MISIOEP get this temperature curve With this record the user specifies the temperature dependent material properties by pre defined Steel curves USFOS 2010 01 01 USFOS USER S MANUAL 6 3 75 Input Description USFOS Control Parameters ALUMTDEP Curveno Matno 1 Mat no 2 Parameter Description Default Curve no Actual Aluminium Reduction Curve No see below Mat no 1 Material numbers referring to MISOIEP to be defined temperature dependent If no material numbers are specified all materials get this temperature curve With this record the user specifies the temperature dependent material properties by pre defined Aluminium curves USFOS 2010 01 01 USFOS USER S MANUAL 6 3 76 Input Description USFOS Control Parameters TDEPFUNC Curve no Type Parameter Description Default Curve no Curve ID no to be referred to from the records STEELTDEP ALUMTDEP and USERTDEP Type Function t
179. wth parameter for y force 0 34 Ditto for z force c6 x moment a6 y moment z moment This record is used to specify material hardening parameters and elasto plastic transition parameters for the material under cyclic loading conditions The default hardening properties refer to the condition where elasto plastic transition is performed see record CPROPAR If elasto plastic transition is not performed the default values are zero c2 c6 need not be given if they are equal to c1 a2 a6 need not be given if they are equal to a1 This record may be repeated SFOS 2010 01 01 USFOS USER S MANUAL 6 3 37 Input Description USFOS Control Parameters 6 3 7 Member Modelling CELHINX elnox ihin1 ihin2 ihinmid Parameter Description Default elnox External user specified element number ihin1 Restriction code for plastic hinge development at first node 0 Plastic hinge free to develop 1 Plastic hinge is suppressed ihin2 Restriction code for plastic hinge development at second node ihinmid Restriction code for plastic hinge development at midspan This record may be used to suppress development of plastic hinges on specified elements Sect 4 5 This record may be repeated PLASTHIN ihint ihin2 ihinmid elnox1 elnox2 Parameter Description Default ihin1 Restriction code for plastic hinge development at first node 0 Plastic hinge free to develop 1 Plastic hinge is suppressed ihin2 Restriction code for plastic hinge
180. y the first 8 characters will be decoded and all characters in excess of this are simply ignored Integer Data Items All characters must be digits The first digit may be preceded by or Example 0 1 27 66 Real Number Data Items Real numbers data entry may consist of up to 3 components i e an integer part i a decimal part d and exponent part e The following 4 basic forms are accepted hi i Bid Sd These may all be combined with exponent parts yielding the forms iE e i E e i dE e dE e Example 0 1 0 2E144 17 E 3 1 8E 3 USFOS 2010 01 01 USFOS USER S MANUAL 6 2 3 Input Description USFOS Control Parameters Text Strings Text strings may consist of one or more characters which may be letters A z digits or special symbols 72 characters are stored in a text string beginning at the 9th character of the line Example This text string uses special characters amp and will be stored as t string uses special characters amp Numerical Operations on the Input Some simple numerical operations is interpreded by the FII input reader This means that the user may define mathematical expressions in the input for example in order to scale paremters The expressions are e Adding e Subtraction e Multiplication e Division D e Trig SIN ang and COS ang ang in radians Example 1 Scaling the yield stress MISOIEP 10 210000E6 0 3 355E6 1 15 7850 1 4E 5
181. yp dT EndT option MaxWind BaseShear 0 5 16 noWrite Typ lCase MaxWind WindLCase 3 Use Wind Field load case 3 i l_ case Type ux uy uz Z 0 z bott Rho Power WindField 2 Z Prof 20 0 0 100 0 0 1 225 0 2 WindField 3 Z Prof O 20 0 100 00 1225 0 2 CUSFOS 10 10 1 0 1 0 lfact mxld nstep minstep 1 0 5 1 0 10 0 010 DeadWeight 3 Ow 520 20 0 0 001 Max Wind forces found by USFOS The wind will be stepped through the structure with a time interval of 0 5 s up to time 16s The wind forces at the time giving the maximum base shear are assigned to loadcase no 3 override read in node and element loads with this loadcase no LoadCase no 3 is referred to as usual in the CUSFOS record This record is given only once USFOS 2010 01 01 USFOS USER S MANUAL 6 3 131 Input Description USFOS Control Parameters 6 3 18 Earthquake NODEDISP case Node _ID dof_code Values Parameter Description Default _case Load Case number for the prescribed displacement which is referred to on the LOADHIST record Node_ID External node number dof_code Integer number defining the prescribed degrees of freedom The dof s are specified from 1 through 6 in global coordinates Displacement in global X direction Displacement in global Y direction Displacement in global Z direction Rotation about global X axis Rotation about global Y axis Rotation about global Z axis Values Reference values for the prescribed displace
182. ype 1 Polynomian expression 2 Vacant Parameters required for the actual function type For function type 1 the required data are The coefficients Ap A1 A2 An to be used in the expression f T Ao AT AQT 4 AnT With this record the user specifies a temperature reduction curve used to control the material properties at different temperature levels This record may be repeated USFOS 2010 01 01 USFOS USER S MANUAL Input Description USFOS Control Parameters 6 3 77 USERTDEP Matno DepE Dep Yield Dep Plastic Dep Exp Parameter Mat no Dep E Dep Yield Dep Plast Dep Exp Description Actual Material ID no to be defined temperature dependent ref to MISOIEP with same ID no E_mod defined in MISOIEP record is scaled according to the defined TEMPDEPY curve number Omitted or 0 means default curve Initial Yield Stress defined in MISOIEP is scaled according to the defined TEMPDEPY curve number Omitted or 0 means default curve Effective Yield Stress referring to the same Yield Stress defined in MISOIEP record is scaled according to the defined TEMPDEPY curve If omitted or 0 the curve for initial yielding is used Thermal Expansion Coefficient defined in MISOIEP record is scaled according to the defined TEMPDEPY curve number Omitted or 0 means default temperature independent Default With this record the user specifies the temperature dependent material prope

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