VERSAT-2D User Manual
Contents
1. de T 14 Wutec Geotechnical International Canada www wutecgeo com VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual Step e Check show boundary condition Check Show x y axis e Uncheck all others Click OK s Elo al ve II Choose model view options under VIEW ww MEW VARIABLES OPTIONS Ta mde Sow loner ben ake ant BT P shorx vans sio vatto yer sron coor Show me nabs e TF tcp EE 2 Some vot 1 T Sow Cor apa ae x vp Nge eg pr 6 B cwm Im Distance Xin Note The boundary conditions of the model are shown above in red solid circle fixed zero displacement in X and Y directions vertical line free vertical displacement horizontal linezfree horizontal displacement Wutec Geotechnical International Canada www wutecgeo com VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 16 24 Apply Distributed Loads This command is used to apply un2. sese Dane Step 4 Choose setup static analysis setup window under DEFINE The forces loads on nodes 90 101 112 123 and 134 are calculated by the program and shown in this window for review click Exit Setup to close this window Generi Parameners State Analyses Coras Ang Soler epg eda Forces or Loads 2 Apong ode Loods D D Applying Water Table or Pore Pressure em D 15 Bua o D im 4 Revoming Sal Layers A m S ModiyMaterol Froceries c D sus Conbinstan ct any athe abovetive casae o 0 Aepling oWnterTeble edu ym oves iterations m 65 Alcwes oce for autngenayee 05 ate Gea rata Cada VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 18 2 5 Assign Soil Zones Continue on the example Step 1 Bring back the model with node numbers i e check show node numbers then choose assign soil zones under TOOLS Click four points as shown below Step 2 Enter soil material number in the Input Box 1 for soil zone 1 and click OK Elements inside the area bounded by the four points are assigned to Material 1 Bm STATIC AND DYNANIC FINITE ELEMENT ANALYSIS OF CONTINUA for I sen as BL o trc n
3. Ta Gena anal Cada VERSAT S2D and VERSAT D2D Version 2012 09 Page I TABLE OF CONTENTS LIMITATION OF LIABILITY INTRODUCTION PREPARING DATA FOR A NEW PROBLEM 21 CREATE A SETTING FILE FOR MODEL SCALE AXIS SCALE AND OTHERS 4 22 CREATE A FINITE ELEMENT MESH 5 23 Ser BOUNDARY CONDITIONS n APPLY DISTRIBUTED LOADS 16 25 ASSIGN SOIL ZONES 18 26 SPECIAL ITEMS FOR MODEL CONSTRUCTION 20 SETUP A STATIC ANALYSIS FRSTSTATIC RUN RUN 1 2 352 DEFINE SOIL AND STRUCTURE PARAMETERS 1 25 33 SECOND AND MORE STATIC RUNS 26 SAVE DATA AND START A STATIC ANALYSIS 28 4 SETUP A DYNAMIC ANALYSIS 41 TURNON DYNAMIC 29 42 KEY PARAMETERS FOR A DYNAMIC ANALYSIS 29 43 SETUP A DYNAMIC ANALYSIS 29 44 ASSIGN BOUNDARY CONDITIONS FOR DYNAMIC ANALYSIS m 45 DEFINE SOIL AND STRUCTURE PARAMETERS FOR A DYNAMIC ANALYSIS 3s 46 SAVE DATA AND START A DYNAMIC ANALYSIS 36 47 DYNAMIC ANALYSIS OF ONE DIMENSIONAL SOLL COLUMN L3 INTERPRETING RESULTS OF A STATIC ANALYS 51 OUTPUT QUANTITIES 52 DISPLAY RESULTS OF A STATIC ANALYSIS USING THE PROCESSOR 39 s INTERPRETING RESULTS OF A DYNAMIC ANALYSIS 61 OUTPUT QUANTITIES 40 62 DISPLAY RESULTS OF A DYNAMIC ANALYSIS USING THE PROCESSOR m 63 RETRIEVING TIME HISTORY RESPONSE A 64 REGARDING NODAL RESPONSE FOR OUTCROPPING VELOCITY OPTION Al Sae Gena rata VERSAT S2D and VERSAT
4. FI osos sapaa D rr nose MATERIAL NUMBER UP TC HMA gema an Wae Gena anal VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 19 Step 3 Repeat above steps but assign Material 42 to the red zone shown in the next figure Step 4 Choose model view options under VIEW e check show element number e check show x y axis e check show material color e uncheck all others click OK peni Sat san tema pr 5 Notes e Suggest saving the data as demo3 sta color codes for material zones are always the same as follow Yellow for Material Red for Material 2 Blue for Material 3 Green for Material 4 Orange for Material 5 Dark blue for Material 6 vyv Brown for Material 7 v and more v Wutec Geotechnical International Canada www wutecgeo com NERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 20 2 6 Special Items for Model Construction 1 Define beam or truss elements choose Assign beam bar elements under TOOLS then click on screen to select two nodal points This action does not add nodes but add elements nodal points the line segment within the two nodes are assigned as beam or bending elements when the beam option is chosen so or One truss element is added to the model
5. VERSAT S2D e Conduct static stress analyses e Conduct static deformation analyses Conduct static pore water pressure applications Conduct static soil structure interaction analyses e Determine pre existing stresses Step VERSAT D2D e Conduct dynamic linear analyses with or without gravity e Conduct dynamic nonlinear analyses of earth structures subjected to dynamic loads from earthquakes machine vibration waves or ice actions Conduct dynamic nonlinear effective stresses analyses to determine soil liquefaction and earthquake induced deformations e Conduct dynamic analyses of soilstructure interaction such as pile supported bridges Step 4 VERSAT 2D Processor View and print finite element mesh including node element numbers e View and print soil material zones Color printer required e View and print analysis results of stresses or displacements View and print acceleration values if applicable View and print analysis results of shear strain or pore water pressure View and print deformed mesh Save graphics as image files emf or gif or jpeg etc VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 4 2 PREPARING DATA FORA NEW PROBLEM Axis Scale and Others 2 1 Create a Setting File for Model Scak 1 The model scale problem extent and axis details axis extent are defined using Set scale under SETTING The Processor wind
6. Figure 6 1 Display of horizontal displacements Disp x in color m una arok moas E win sa il nn wwe NU susueaerdng pauore Spa pue gt rene ees Lio ousiey _ 0 pro ewa pue anea sg mous i NOUS 1 SIGNA simpan peoj mous 1 morsen NOUS 1 mous sesunu wae Mays 1 mous 1 SNou40 Toon 002 eyentuzieg ubeng ei sapun BANG New Wutec Geotechnical International Canada www wulecgeo com Appendix A Examples for plotting displacements and others by values or by color Plotting steps to show disp values Load input data run2 sta 4 4 Select Show value with format 0 00 5 Select a variable Disp x as shown 2 Load output data run2 dis sig amp press OK Load setting file setting gw log 3 peo lili lee AT 1 4 1 _ fee 119 Tur Wu eor pex pru por pre ir mene VIEW MODEL OPTIONS Show node numbers Show element numbers Showx y axis Show material color Show material number Show layers by color Show boundary conditions
7. tet el RUN 2 CANCEL b SETUP Figure 3 4 A static setup window for Run 2 ate Gena aai ada 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 27 Click Add in the sub window Apply a Water Table add two points to define a water table as shown in Figure 3 4 Click Apply and then Exit Setup Follow steps in Section 2 4 to apply non uniform distributed loads node 90 to node 134 Section 2 4 is there for instruction purpose on the surface from Go back to Setup static analysis and Setup Window again The window as shown in Figure 3 4 should contain the loads for nodes 90 101 112 123 and 134 Refresh the model using Show layers by color and Show load vectors as shown in Figure 3 5 elevation m Figure 3 5 A window showing layers and loads for Run 2 Note static run can be deleted by pressing the DELETE LAST button Only one static run with the highest run number is deleted at a time ats Gena rata 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 28 3 4 Save Data and Start A Static Analysis Continue on the example Save the data as 2 5 using Save Dara under FILE gt Choose versat 2d under RUN Enter the User Name and Password Press Connect see Figure 3 6 Select the input file run2 sta to run after an
8. 4 2 Key Parameters for a Dynamic Analysis 1 Choose General parameters under DEFINE Gravity on off On default Choose Gravity Off enter 1 in the box to run dynamic analysis of a 1D soil column 3 Gravity acceleration 9 81 m s default for metric unit gt Enter 9 81 in this box to use a sine input instead of a time history input The use of a sine input is demonstrated in an example file called ex_d2 dyn 4 Method of analysis non linear default gt Choose non linear effective stress to include dynamic pore water pressures in the calculation of soil strengths and ground displacements see Section 3 5 of the Technical Manual for details 4 3 Setup a Dynamic Analysis Continue on the example and name the input file of the dynamic analysis as 1 Choose Setup dynamic analyses to start a setup for dynamic analysis Enter 115 for an input file named run3 prx to read in the stresses of these 775 elements It is for NPRE When the dynamic analysis starts the program automatically looks required that the run2 pr4 see Section 3 4 be renamed manually as 3 prior to this dynamic analy Otherwise the program stops because of incomplete input files VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual the dynamic analysis Otherwise the gt The data format for run3 ACX is shown in the left and lower area of the setup wind
9. Combination ct any atthe above ke casas AA finer rases iterations fo is i Botore gang WE Loads moths p waster uem natoer Perorning Excavation 220 RES EOS iiss is SPEGFYua ewa _PREVOUS rundah wih DELETE LAST veto nc T uneton rot EMIT SETUP Figure 3 1 A static setup window Wae Gea nana 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 24 Choose model view options under VIEW gt check show element number check show x y axis v check show layers by color v uncheck all others click OK v View MODEL OPTIONS VARIABLES OPTIONS T Show nae unter how doormen mash P snow bers srabi yana ana kamat P Stow vans T Show vatatioty clr T Stow material enor Stow number show laras clr T Snow beans conatons f T Show load vacios lor Legend at So VERSAT 2D STATIC AND DYNAMIC FINITE ELEMENT Figure 3 2 window showing layers in color Wutec Geotechnical International Canada www wutecgeo com
10. D2D Version 2012 09 Introduction Page 1 INTRODUCTION VERSAT 2D is a software package consisting of three computer programs namely VERSAT 2D Processor the Processor VERSAT S2D and VERSAT D2D It is noted that these three components of VERSAT 2D function independently Interactions among them take place through data files saved in Windows Explorer file folder A brief description for each program is provided below VERSAT 2D Processor the Processor is a Windows based graphic interface program It serves as a pre and post processor for VERSAT S2D and VERSAT D2D The program is used 10 generate a finite element mesh define soil zones assign material properties define boundary conditions assign pressure loads and generate input data for VERSAT S2D amp VERSAT D2D The program can also display and plot results from analyses such as stresses displacements accelerations pore water pressures and a deformed mesh VERSAT S2D is a computer program for static 2D plane strain finite element analyses of stresses deformations and soil structure interactions The static analyses can be conducted using stress strain constitutive relationships from linear elastic model to elasto plastic models i e Mohr Coulomb model and Von Mises model This program can also be used to compute determine static pre existing stresses for use in a subsequent dynamic finite element analysis Main features of VERSAT S2D are e Linear elastic
11. Show water level Show load vectors Show Color Legend at X3 Y Nie Due io conticing anty ofthe Flur guaritas ronm in descending proni show layers by color 2 show aroma mest maleria color 4 show vanana by alor CANCEL VIEW VARIABLES OPTIONS 7 Show deformed mesh Showbyvalueandtomat 000 Show variable by color Value ranges ter colo Reversecolor Selecta variable Disp x Slate output MS su 3 Fos Dynamic output Stress x OSR and factor Stress pes Stress Vol strain Strain xy 5 PPRIFSIiq Plotting steps to show disp by color 1 Load input data run2 sta 2 Load output data run2 dis sig 6 4 5 8 Select Show variable by color Select a variable Disp x as shown Change value ranges as required Select Show color legend Press OK manually add text indicating disp ranges VIEW MODEL OPTIONS Show node numbers Show element numbers P Showx y ads T Show material color Show material number Show layers by color F Show boundary conditions Show water level Show load vectors Show Color Legend at Xed Y 0 fro shows yr ow loto oen 3 show mata cotor 4 show variabla ey elor CANCEL VIEW VARIABLES OPTIONS Show deformed mesh Show by value and format Show variab
12. VERSAT 2D STATIC AND DYNAMIC FINITE ELEMENT E LANA AAN SANAN LAA pe AAN LANA ANAN LAN NG T E pe qu pn qe E Step 9 Use Clear duplicate nodes elements then under MODIFY to re organize the mesh DEFINE TOOLS VIEW MODIFY RUN sicud BE DECHE EEEE U Note Suggest saving the data as demo sta Vacca natal ada oo maT 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 11 Step 10 Choose Draw line under TOOLS then click on Node 5 and Node 121 20 STATIC AND DYNAMIC FINITE ELEMENT A SETTING DEME TOOLS VIEW MODIFY BUN HELP tela 1 BEW E weder arah SS 121 EE ei EEEL EEEL ats Gena Teaia VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 12 Step 12 Use Clear duplicate nodes elements then Sort 1 under MODIFY VERSAT 2D STATI
13. VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 25 3 2 Define Soil and Structure Parameters Continue on the example v Choose Input material parameters under DEFINE Enter 1 in material number box v v Select Sand in the sub window Select a Material Type v Edit the parameter boxes as needed default values are shown herein Click Add modify a material button Enter 2 in material number box vv Select Clay in the sub window Select a Material Type Edit the parameter boxes as needed default values are shown herein Click again Add modify a material button Click APPLY ALL button to save and exit this window v pt ans Dane art Ne Sec Ton TE maa rei a Opi erede E m hr aa s Cia ot streng sess Si Sat s PN or Ml FR ka X umen a ohm cb s T A m usage SSeS Rod SOI s om Un Pa EASW m ky IC NCC Ua Top SIATCRUN 1 er ama Figure 3 3 A window showing material parameters defined in Run 1 at Gena natal ada 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 26 3 3 Second and More Static Runs A new static run
14. base 8 Y acceleration at the base Response codes for element response are 1 Stress X or bending moment at centre of a beam element lhear Strain in axial force of a beam truss element Shear Stress tsy or shear force of a beam element Pore Pressure Ratio PPR or bending moment at J node of a beam element Stress Y Normal strain X in 7 Normal strain Y in y 8 Volumetric strain 6 The option List is disabled in Version 2011 is 7 While the option List under the sub window To modify is chosen and on location and magnitude of dynamic loads are entered by clicking Add an item The input box requires at Gea ran ada oe na NERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 33 9 two parameters a nldof degree of freedom number printed in run3 oug at which the load is applied and b fdof linear scaling factor for nldof by which the input loads in run3 eg are multiplied This option is not used in this example While the option List D under the sub window To modify is chosen and on a water table can be defined by clicking Add an item water table already defined in a static analysis is maintained and transferred into a dynamic analysis when Dynamic On is turned on Review the water level parameter default 0 for function not used An input box is located above the
15. file include node disp x disp y ace x g acc elem sig x mx0 sig y ta tauxy sh gamm mj tauxy_dyn sigv0 vol pprFSliq The meanings of these quantities are explained as follows 1 node list of node number in this column 2 disp x list of displacement in X direction instant at time t or maximum 3 disp y list of displacement Y direction 4 acce x list of acceleration in X direction instant at time t or maximum 5 acce y list of acceleration in Y direction 6 elem list of element number in this column 7 sig x mx0 effective stress in horizontal X direction for a soil element If this is a beam element mx0 is the bending moment at the centre of the element 8 sig y ta effective stress in vertical Y direction 0 If this is a beam element is the axial force in the element 9 tauxy sh shear stress including static shear stress in the XOY plane If this is a beam element sh is the shear force of the element 10 mj shear strain in percentage in the XOY plane yxy If this mj is not define is a beam element 11 tauxy dyn sigvO the ratio of maximum dynamic shear stress not including static shear stress over the initial effective vertical stress 12 101 volumetric strain in percentage caused by dynamic load 13 ppr FSlig dynamic pore water pressure ratio PPR or factor of safety against liquefaction F
16. in the element 11 su shear strength 12 fos factor of safety against a shear failure 13 sig m effective mean normal stress To present the results using the Processor nodal displacements are duplicated in an output file with an extension of DIS such as ex d 0 dis and element quantities are duplicated in an output file with an extension of S G such as ex dI0 sig The geometry output file carries an extension of such ex d10 oug and contains the geometry input data including node information X and Y coordinates degrees of freedom and element information node composition element type material number and pore water pressures VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 39 The stress output file carries an extension of PR4 such as ex d10 pr4 and contains stresses at The s contained in this file are referred as the pre existing stresses In a subsequent static or dynamic every Gauss point of the finite element model including structural element resses analysis this file should be renamed or copied as an input file with an extension of PRX 5 2 Display Results of a Static Analy is Using the Processor 1 Select FILE and choose LOAD DATA to load an input data file such as ex d10 sta 2 Select SETTING and choose LOAD SETTING to load a problem specific setting file such as ex_d10 log This will allow the geometry of the model to be shown pro
17. model Von Mises model Mohr Coulomb model Stress level dependent stiffness parameters e External load applications e Staged construction by adding layers Staged excavation by removing layers Pore water pressure application Calculation of stresses and deformations caused by strain softening of soils Simulation of sheet pile wall and anchors e Updated Lagrangian analysis e Factors of safety calculation Gravity on and off Calculation of pre existing stresses for use in a dynamic analysis using VERSAT D2D VERSAT S2D and VERSAT D2D Version 2012 09 Introduetion Page 2 4 6 node and 8 node solid elements to represent soils e 2 node line elements to represent sheet pile walls beam or anchors bar truss of any consistent units and sign conventions VERSAT D2D is computer program for dynamic 2D plane strain finite element analyses of earth structures subjected to dynamic loads from earthquakes machine vibration waves or ice actions The dynamic analyses can be conducted using linear or nonlinear or nonlinear effective stress method of analysis The program can be used to study soil liquefaction earthquake induced deformation and dynamic soil structure interaction such as pile supported bridges Main features of VERSAT D2D are Application of horizontal or horizontal and vertical ground accelerations at a rigid base e Application of horizontal outcropping ground vel
18. then included in NPRE elements i e elements having stresses and NPRE is increased automatically x static run can also contain no layer of elements to be added to NPRE In this case gravity forces are applied to all elements in the model and NPRE is deemed to be equal to the total number of elements of the model Thus the sub window Apply No of Elements in a Layer is left blank v In addition to being used in Run 1 this load application Add Soil Layers can also be used in subsequent static runs until the updated NPRE reaches the total number of elements of the model v This load application Add Soil Layers is void when the option for gravity is set OFF at Gena VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 22 Apply Water Table gt water table or a piezometric surface is defined in a sub window Applying a Water Table Points are added manually by clicking the Add button and entering X and Y coordinate of a point A water table connects all points in the sub window consecutively water table or a piezometric surface once defined will remain unchanged until they are replaced updated by another one defined in a subsequent static run Note Choose define water level or pore pressures under TOOLS to 1 compute pore water pressures from a pre defined water level or 2 assign constant pore water pressures or pore pressure ratios within
19. to connect the two nodes when the truss option is chosen Nodes on a beam element are assigned rotational degree of freedom in addition to the two translational degree of freedoms as shown in blue circles S gt It is recommended that this action be performed at the end of a mesh construction This figure on beam element is shown for display only The beam elements are not included in the example that is presented earlier and later Computer loads from water pressure choose Verify or use water loads from 0 under TOOLS This option allows that water loads on a submerged ground surface be calculated by the program automatically using a defined water level of such as in a reservoir This parameter 0 is specified in setup window in Figure 3 1 Section 3 1 bulletin 7 for a static analysis and in Figure 4 1 Section 4 3 bulletin 9 for a dynamic analysis More detailed instructions regarding its usage are provided in the Processor when the option is invoked Gea ads VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 21 3 SETUP A STATIC ANALYSI 3 1 First Static Run Run 1 A static analysis is setup using DEFINE Choose General parameters to define key parameters that control the analysis including option for gravity ON default or OFF constants of gravity acceleratio
20. APPLY button in Figure 4 1 This function is invoked by entering a positive value commonly the reservoir elevation in the input box Be very cautious in initiating this function Once it is invoked water loads on all submerged surfaces are automatically computed and updated with time of shaking using Y coordinate of the deformed surfaces Its usage is recommended when submerged ground surface is expected to deform under loading or ground shaking Refer to Section 2 6 bulletin 2 for its veri ation Sae Gena rata VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 34 44 Assign Boundary Conditions for Dynamic Analysis In addition to the boundary conditions used in a static analysis as described in Section 2 3 boundary conditions used in dynamic analysis also include the free field stress boundary and the viscous boundary Free field Stress Boundary The free field stress boundary is described in Section 3 12 of VERSAT 2D Technical Manual This boundary condition should only be used in a dynamic analysis and only for side boundaries and it is assigned by typing boundary code 1 in the input box in Figure 4 2 see Section 2 3 Viscous Boundary The viscous boundary must be and is only applied when Hori Outcropping Velocity is chosen as the option for input ground motion in Figure 4 1 In order to use this option the finite element model should have a horizontal base with a viscous boundary T
21. C AND DYNAMIC FINITE ELEMENT A File SETTING DEFINE TOOLS VIEW MODIFY RUN HELP jeg Soe AL AD e laa vw im kemana ze ZI dud node 42 and 50 causes large bandwidth SORTING DONE rode difference 18 found in element 103 Step 13 Use Finite element node grid points under DEFINE to adjust X and Y coordinates of node 12 and node 50 SETTINS DEFINE TOAS VIEW MODIFY RLN FEP 126 P JUREE yz o rotae wr pe tros Sae Geka simal ada oe na 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 13 Step 14 Perform Clear duplicate nodes elements then node element under MODIFY SETTING DEFINE TOOLS MODIFY RIN HELP v JOEREI 7 p ge Ww E ii B pega EB normal bandwidth after adjustment SORTING DONE node difference 12 found in element 115 Notes e Suggest saving the data as demo2 sta The purpose of adjusting coordinates of node 12 and 50 shown in Step 12 is to reduce the band width of the model This is done by relocating node 12
22. Dynamic Analysis Continue on the example Save the data as run3 dyn using Save Data under FILE Choose Run versat d2d under RUN gt Enter the User Name and Password gt Press Connect No Select the input file run3 dyr to run after as shown in Figure 4 4 successful Goto STEP 2 in red is obtained Running VERSAT D20 Step 1 Get Authorization from Internet UserName gwu Password Successtul STEP 2 Step 2 Select File to Start Abon Now unbalanced farce 16 01 gravity forca 0 00 unbalanced force 16 27 gravity force 0 00 unbalanced force 19 28 gravity force 0 00 unbalanced force 13 45 gravity forca 0 00 unbalanced force 12 gravity force 0 00 unbalanced force 10 24 gravity force 0 00 unbalanced farce 7 82 gravity force 0 00 unbalanced force 934 gravity force 0 00 unbalanced force 12 20 gravity force 0 00 unbalanced farce 11 61 gravity torce 0 00 unbalanced force 8 74 gravity force 0 00 time 2 700 steps 142 unbalanced force 6 51 gravity farce 0 00 2 710 ctope 143 unbalanced force 27 75 gravity orca 0 00 time 2 720 44 unbalanced force 23 78 gravity farce 0 00 time 2 730 unbalanced force 18 42 gravity force 0 00 unbalanced farce 16 87 gravity torco 0 00 unbalanced force 13 88 gravity force 0 00 unbalanced force 56 73 gravity force 0 00 unbalanced forco 58 93 gravity torco 0 00 unbalanced force 67 92 gravity force 0 00
23. Sliq To present the results using the Processor nodal displacements are duplicated in an output file with an extension of DIS such as ex 4106 46 and element quantities are duplicated in an output file with an extension of SIG such as ex dI0b sig The geometry output file carries an extension of OUG such as ex_d 0b oug and contains the geometry input data including node information X and Y coordinates degrees of freedom and element information node composition element type material number and pore water pressures at Gea anal 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 41 6 2 Display Results of a Dynamic Analysis Using the Processor 1 Select SETTING and choose DYNAMIC ON to tum dynamic option 2 Select FILE and choose LOAD DATA to load an input data file such as d10 dyn 3 Select SETTING and choose LOAD SETTING to load a problem specifi ex_d10 log This will allow the geometry of the model to be shown properly on screen setting file such as 4 Select FILE and choose LOAD OUTPUT to load the output files containing displacements and stresses such as ex_d 0 dis and ex dI0 sig It is noted that the Processor can only load set of results displacements stresses etc to di must be deleted from a DIS file and a SIG file in order to load the second set of results 5 Select VIEW and choose MODEL VIEW OPTIONS to select the type of information you want to show
24. VERSAT 520 amp VERSAT D2D Version 2012 09 STATIC AND DYNAMIC 2 DIMENSIONAL FINITE ELEMENT ANALYSIS OF CONTINUA USING WINDOWS XP VISTA amp WINDOWS 7 Volume 2 USER MANUAL 1998 2012 Dr G WU 1998 2012 Wutec Geotechnical International B C Canada Website http www wutecgeo com VERSAT S2D and VERSAT D2D Version 2012 09 Page I LIMITATION OF LIABILITY The following terms and conditions with regard to limitation of liability must be accepted to proceed with the use of VERSAT 2D This product is licensed to Authorized User only Wutec Geotechnical International BC Canada VERSAT 2D Package for Windows Net 3 5 Version 2012 08 Copyright c 1998 2012 Limitation of Liability Although the licensed product software has been tested extensively by the publisher and experience would indicate it is accurate within the limits given by the assumptions of the theory and data used the publisher Wutec Geotechnical international and the author G Wu assume no liability whatsoever with respect to any use of VERSAT 2D package or with respect any damages or losses that may result from such use Any use of the software to solve problems is the sole responsibility of the user as to whether the output is correct or correctly interpreted or the problem correctly modeled The terms and conditions in the limtation of liability outlined above must be accepted to proceed with the use of the product ACCEPT REJECT
25. VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 8 Step 5 Add more nodes using Finite element node grid points under DEFINE GG AA Rs Taek 7 ur pee ne pr per ac e gru per qus ja kaja jaja e 2 1 3 m S 7 W Ww Note NYAR IKI DO DG for view on Nade NVARI 3 Eus D 0 D v Cance nodos 100 otomonte positon 20050 4800354 y 129 82404157151 STATICON Problem Ta Gena anal 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual poge9 Step 6 OK to show nodes 122 and 123 VERSAT 2D STATIC AND DYNAMIC FINITE ELEMENT SETTING 20 STATIC AND DYNAMIC FINITE ELEMENT A Element 7 BE pu side sida un No of element IN CNN d Wutec Geotechnical International Canada www wutecgeo com VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 10 Step 8 OK and then click on nodes 111 122 123 and 121 to create a 4x10 grid
26. a soil zone see Volume I Technical Manual for details of applications Detailed instructions are provided in the Processor when this operation is invoked gt This window may be left blank if a water table does not exist gt LWSTEP I should be used Apply nodal forces or loads gt In addition to using Apply distributed load under TOOLS as described in Section 2 4 individual loads can also be added or edited in a sub window Applying Nodal Forces or Loads gt Loads should not be applied to elements that are not included in the current model as defined by NPRE LSTEP I should be used 4 Perform Excavation This is a reverse process of adding soil layers described above The option in the sub window Performing Excavation is set to YES 9 The number of elements to be excavated or removed NEXC is entered in the sub window Apply No of Elements in a Layer Only one layer of elements should be defined in this sub window Multiple layers of elements should not be used for this application The element number of these elements is entered in the sub window Performing Excavation 5 Modify Material Parameters gt One set of material parameters are used for one static run v A set of material parameters will remain unchanged and effective until they are replaced updated by another set of parameters defined in a subsequent static run A When initiating a n
27. and node 50 so their X coordinates are equal to or greater than those of node 17 and node 58 also shown in Step 12 respectively The model after the node adjustment is shown in Step 14 This process reduces the maximum node difference in the model from 18 to 12 This kind of node adjustment may reduce a problem size to half As an example a finite element grid of 6000 elements 120 x 50 should have a band width of approximately 100 and a problem size of approximately 12 000 000 However the problem size could be doubled when the band width is 200 due to inadequate node numbering As a result computing time in a dynamic time history analysis may be increased from 4 hours to 8 hours for one analysis at Gea ads VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 14 2 3 Set Boundary Conditions Continue on the example Step 1 Choose free all boundary under MODIFY Step 2 Choose assign boundary conditions under TOOLS to define boundary conditions For left boundary click node 2 and 5 For the bottom click node 1 and 124 For right boundary click node 125 and 134 and then assign boundary code as appropriate All nodes on the segment within the two points will be assigned to a specified boundary condition Dill eal w IIR To assign isp y xed disp x for nodes 12510 134 ype
28. authorization is obtained Step I Get Authorization kom UserName gwu Password Connect Now Stop 2 Solect Fil to Stat Abort Now data i a modes 0 position 126 640418947507 560979609756 STATICON Tie Figure 3 6 A window showing Run versat s2d under RUN Note Results of this static run include file named run2pr4 This file is needed in a subsequent dynamic time history analysis An Internet connection is required in order to run any analyses using VERSAT 2D However it is not required for data preparation Vacca natal VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 29 4 SETUP DYNAMIC ANALYSIS 4 1 Turn On Dynamic In general a dynamic analysis can start only when gravity induced static stresses within a finite element model are determined in a static analysis As such the dynamic analysis model can be constructed using the same finite element model as the one used for that static stress analysis Continue on the example in Section 3 and prepare data for a dynamic run 1 Restart the Processor Load the setting file see Section 2 1 using Load Setting under SETTING Load the data file run2 sta see Section 3 4 using Load Data under FILE 4 Click Dynamic under SETTING and select Yes Note DYNAMIC ON should be shown at the bottom of the Processor
29. d in the file run3 FXY When the option Hori Outcropping Velocity is chosen the input velocity time history is provided in the file run3 VEX The data format is same for run3 ACY or for run3 ACX or for run3 FXY or for runi VEX Refer to NicoM_IcACX in the examples library copy NicoM 1ACX to run3ACX Review modify as needed the following parameters viscous damping of mass An see Section 3 2 of the Technical Manual default 0 5 viscous damping 56 of stiffness also see Section 3 2 defaul time interval s for saving output default 100 sec recordable quantities such as accelerations displacements shear stress and pore water pressure are printed at this specified time interval in sec in the output file oud and in the plotting files dis sig time interval s to update viscous damping default 1 5 sec In a nonlinear analysis the frequencies of the model vary with time of shaking The viscous damping constants a b in Section 3 2 of the Technical Manual are updated at the specified time interval in sec PWP not generated after this time sec default 50 sec In a non linear effective stress analysis and within this specified time of shaking dynamic pore water pressures are calculated and added to stresses of soil elements and are included in the force equilibrium Beyond this time dynamic pore water pressures are kept the same as at
30. dary conditions for a static analysis VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 38 5 INTERPRETING RESULTS OF A STATIC ANALYSIS 5 1 Output Quantities Now let s use ex 410 from the example library as an example for Sections 5 and 6 The main output file from a static analysis carries an extension of OUT such as ex dI0 our The quantities in the main output file include node disp rot disp y elem sig x mx0 sig Ma tau xy sh gamm_xy mi pp su fos sig m The meanings of these quantities are explained as follows l node list of node number in this column disp x list of displacement in X direction incremental if imsh 0 cumulative if imsh 1 3 rot rotation at this node applicable for a beam node only 4 ist of displacement in Y direction 5 ist of element number in this column 6 sig x mx0 effective stress in horizontal X direction for a soil element If this is a beam element mx0 is the bending moment at the centre of the element 7 sig y ta effective stress in vertical Y direction If this is a beam element ta is the axial force in the element 8 tau xy sh shear stress in the XOY plane tsy If this is a beam element sh is the shear force of the element 9 gamm_xy mi shear strain in percentage in XOY plane If this the bending moment at the first node of the element beam element mi is 10 pp pore water pressure
31. ena Seas Noda Y secar ry 575 D 0 o mm o 0 wa er aha o 0 18 o E cwm m Figure 4 1 A setup window for a dynamic analysis Wutec Geotechnical International Canada www wutecgeo com page 30 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 31 v x NRVSUB is number of sub time step 0 for no modification to the ground motion data run3 ACX for inserting one point 2 for inserting and so on to two consecutive data All sub time and time interval provided in the two points 3 for inserting three points steps are created by linear interpolation of acceleration data and time interval DT NLINE is number of record lines and NoPerLine is number of data per record line Data points must be in CSV format or comma delimited The data for ground motions are in the same unit as the gravity acceleration m s for metric unit Tt is also noted When the option Hori Vert Base Accelerations is chosen another input file run3 ACY is required This file provides data for vertical ground accelerations at the base of the model It is noted that the time interval DT must be same for run3 ACX and run3 ACY otherwise DT from run3 ACX is used for run3 ACY When the option Forces at Nodal Points is chosen the input force time history is provide
32. ew static run a user has the option to define a new set of parameters which can be modified from the current set of parameters i Modifying soil parameters from strong to weak such as strength reduction due to soil liquefaction can cause deformations in sloped grounds ats Gea ads oe na NERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 23 6 Review maximum of iterations ITERMX static load application terminates when ITERMX is reached or the requirement for allowed unbalanced force is satisfied 7 Review the water level parameter yw10 default 0 for function not used For static runs this parameter is applied only when the large strain option is chosen for the analysis see Section 4 3 bulletin 9 for more details on its usage Continue on the example in Step 4 of Section 2 5 gt Start Setup static analysis and Setup Window gt Delete the nodal forces within the sub window Applying Nodal Forces or Loads They are added later in static Run 2 gt Click Add a layer in sub window Apply No of Elements in a Layer add two new layers with 28 elements each gt Click Apply and Exit Setup General lorte of he Sc Arriva Neda Forces Leads Applicaton Casas 1 Acting SolLeyers 2 Applying edel Loads Applying e Water Table or Pare Pressure Nede am Fx A Femina SoilLoyers 5 Modify Moterol Propartes
33. he viscous boundary condition is assigned by typing boundary code 2 in the input box in Figure 4 2 see Section 2 3 CJ VERSAT 20 Input Box boundary 0 xy tree 1 y free 2 x free 3 xy fixed 1 ff TA VESA STAT AND DINANE RENENT ANAE OF CONTINUE Des a en al EE P Figure 4 2 A finite element model assigned with free field stress boundary on the sides and viscous boundary at the base at Gena ads oe nan VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 35 45 Define Soil and Structure Parameters for a Dynamic Analysis Continue on the example 1 choose Input material parameters under DEFINE to define material parameters for dynamic analysis as shown in Figure 4 3 2 Enter 1 in material number box Select Sand in the sub window Select a Material Type Note that the sub window PWP model parameters DYNAMIC is now enabled for PWP model and its parameters Edit the parameter boxes as needed default values are shown herein except 1000 Click Add modify a material button Select Clay Edit the parameter boxes as needed default values are shown herein 9 Click again Add modify a material button 10 Click APPLY ALL button to save and exit this window 4 5 6 Enter 2 in material number box 7 in the sub window Select a Material Type 8 Notes gt Click on a parameter box in blue
34. iform or non uniform distributed loads on a surface such as structural loads on a footing and water pressures on a submerged surface Continue on the example Step 1 Bring back the model with node numbers i e check show node numbers then choose apply distributed load under TOOLS click nodes 90 and 134 Step 2 Enter pressure shear intensity at the 1 and 27 nodes 40 and 20 respectively then enter inclination angle of the pressure 0 for pressure normal to the surface Note Use an inclination angle of 90 if pressure is parallel to the surface The pressure intensity between the two nodes is computed by linear interpolation m VERSAT 2D STATIC AND DYNAMIC FINITE ELEMENT SETTING DENE Slo AL 15 Node 90 pressure intensity 40 kNimim 2st Node 134 pressure intensity 20 kNim m paper gf p Em E gms RSAT 2D Input im Yessurichear Manet at first point Wae Gena anal 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 17 Step 3 Choose model view options under VIEW check show load vectors check show x y axis uncheck all others and click OK Note Force vectors are shown in red lines starting from the nodal points LT
35. is normally required when nodal loads or the water table or soil properties are changed These quantities are unchangeable within a static run Continue on the example to setup a second static run Run 2 Start Setup static analysis and Setup Window again gt Press NEW RUN button and YES to initiate a new static run v Copy Soil Parameters from RUN 17 and No to not redefine soil parameters If changes on parameters are required then answer YES to copy and modify gt Click Add a layer in the sub window Apply No of Elements in a Layer add one new layer with 59 elements as shown in Figure 3 ener Parmeter or State Analyses Sc evi Nodal Forces or Leads Applicaton Casas 2 Applying Nodal Loods 3 Appiying e Waler Table or Pare Pressure mm o o im 4 Fevoming Is H z 5 Modit Marstal Praparies o o 58 Combination ct any atthe above ke casas ofelemants E as rosses 3 Appling 2 Water Table yescrohwwle eir Matene MER Aloners utendo 2 40100 flor quis ene py No ofE lam orts ne Loyer Penaming Excavation onsucionfcevosor olelarienisnleyarl 59 ces Ada sleyer Delete a layer _PREVOUS pol deme me
36. le by color Value ranges for color pf fos los H fe lt Selecta variable Disp x p Sta Disp y csu Acce x C Acte y Stress x Stress y Stress xy senik 3 Load setting file setting_gw log 7 me Color Legend Ranges of displacement pro P kr 00 Plotting steps to show disp by 4 1 Load input data run2 sta 5 2 Load output data run2 dis sig 6 3 Load setting file setting gw log 7 Select Show variable by color Select a variable Disp y as shown Change value ranges as required Select Show color legend Press OK 8 ea 16 9 Coler ges or displacement m a manually add text indicating disp ranges VIEW MODEL OPTIONS VIEW VARIABLES OPTIONS Show node numbers Show deformed mesh Show element numbers Show by value and format Showx y axis Show variable by color Show material color Value ranges for color Show material number 0 55 Show layers by color es B Show boundary conditions P a Rev Show water level Select variable Show load vectors Disp x scout Statie uem at f 0 Ye Nol Due coring one ot c Acte y E quante showin dawaning manico sh layer eor p
37. m ah ow rata a Son variaba by tala Stress xy str CANCEL Strain 9y 6 PRIF um e Plotting steps to show disp by value and by color 1 Load input data run2 sta 2 Load output data run2 dis sig 3 Load setting file setting gw log PEEN maipi Color Legend Ranges of displacement 10 05 4 Select Show variable by color 5 Also Select Show 6 Select a variable Disp x as shown 7 Press OK VIEN MODEL OPTIONS VIEW VARIABLES OPTIONS Show node numbers Show deformed mesh Show element numbers Show by value and format 0 00 Show x y axis 7 Show material color 7 Show material number Show layers by color Show boundary conditions Show water level Show load vectors Show Color Legend at Xe 0 Ye 50 Nol Due o condiding one ofthe Poleng arine imn ayers br 2 show mean 3 show enon Shaw vanae br CANCEL gt Show variable by color Value ranges for color os 05 fi J Reverse c Selecta variable Disp x sate ouput Statie Disp y iS Acce x 5 Fos Dyan ouput Stress x 7 058 and fac Stress y pes stress xy Vol strain Strain xy PPRIFSQ
38. n unit weight of water and atmospheric pressure option of linear or nonlinear default static analysis and option for small strain default or large strain updating mesh The default constants are for metric units Choose Serup static analysis and then Setup Window to start a setup window as shown in Figure 3 1 An input file for a static analysis can contain one or multiple static runs The first of these static runs is called Run 1 static run may include one or a combination of the following parameters or load applications 1 Add Layers add gravity force s A static run can start with NPRE elements that already have stresses default NPRE 0 v Gravity forces have already been applied to these NPRE elements having stresses sub window Apply No of Elements in a Layer is used to add one layer or multiple layers of elements to NPRE to which gravity forces are applied A static run can contain multiple load applications i e multiple layers Gravity is applied or turned on layer by layer but one layer each time Assuming the number of elements in the layer is the total number of elements included in this load application should be NPRE u4s NPREeNADD other elements with element number greater than NPRE 4 4 are automatically excluded in this load application E At the end of this load application elements in this layer are
39. nodes with their Choose Draw finite element grid under TOOLS to create finite elements Enter number of elements for each grid side and press OK Then click on screen for 1 2 3 and 4 nodes that form the finite element grid Use Draw line under TOOLS to create a boundary within a finite element mesh It is required to organize the mesh after this modification Choose Cut remove finite elements under TOOLS to remove finite elements that are not needed Then click on screen to select four points The nodes and elements within a block enclosed by the four points will be removed It is required to organize the mesh after this modification organize a modified mesh choose Clear duplicate nodes elements under MODIFY then perform Sort node element under MODIFY This process renumbers nodes and elements of the model 17 needed use Finite element node grid points under DEFINE to change X and or Y coordinates of a node If needed use move grid line under TOOLS to move a grid line within a finite element mesh An example for creating a finite element mesh follows Very important notes During the course of mesh construction it is recommended that data be saved using Save Dara under FILE as frequently as possible You may find it necessary to save data from various stages in a mesh construction using different names such as conl con2 con3 cond ete because the Pr
40. ocessor does not provide undo functions VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 6 Step Use Finite element node grid points under DEFINE to pre define four nodes VERSAT 2D STATIC DYNAMIC FINITE ELEMENT ANALYSIS OF OK ena Ip Step 2 Use Draw finite element grid under TOOLS to create a 10x10 finite element grid VERSAT 2D STATIC AND DYNAMIC FINITE ELEMENT ANALYSIS OF CO Ye sa E oe AL FF adl v IBI P lemen Na arema gt ats Gena natal Cada oo wa 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page Step 3 OK and then click on nodes 1 3 4 and 2 to create 10x10 grid ps pe pop E pes pa ps ps pr sr pe pur ps p pe pe pr e pu por nz as pz pr s Be e qu qe on 7 gms gt qe pe e gs ue jon p pu pu o es pae ps pe wy que uo s pu jn pa ps ja e ur re e pu pu pu pe ee pue p p 49 8L Ti a 93 Wir Step 4 Use Clear duplicate nodes elements then Sort node Jlelement under MODIFY to re organize the mesh m VERSAT 2D STATIC AND DYNAMIC FINITE Tat Gena anal 6
41. ocities at a viscous elastic base Application of a load time history at any nodal points Global force equilibrium enforced at all time e Linear elastic model Non linear hyperbolic stress strain model for sand Non linear hyperbolic stress strain model for clay Stress level dependent stiffness parameters Effective stress model including dynamic pore water pressure Three models for computing dynamic pore water pressure e Strain softening but dilative silt model Mohr Coulomb failure criterion Modified stiffness parameters by dynamic pore water pressure Calculation of ground deformations caused by soil liquefaction Calculation of factor of safety against liquefaction Simulation of sheet pile wall and anchors e Updated Lagrangian analysis Gravity on and off e Free field stress boundary e 4 node solid elements to represent soils e 2 node line elements to represent sheet pile walls beam or anchors bar truss Use of any consistent units and sign conventions ats Gena aai ads oe na 6 VERSAT S2D and VERSAT D2D Version 2012 09 Introduction Page 3 FLOW CHART TO ILLUSTRATE TYPICAL STEPS IN A DYNAMIC ANALYSIS Sep i VERSAT 2D Processor Generate a finite element mesh QD e Define soil zones and material parameters Define structural elements and parameters Define boundary conditions apply pressure loads Generate data for VERSAT S2D or VERSAT D2D Step
42. on screen including node numbers element numbers material colors boundary conditions displacements stresses and others lay Therefore the first set of results Notes example of ground using NicoM_Ic dyn as input data isplacements at the end of shaking is shown in Figure 6 1 The data entered in the windows in Figure 6 1 such as Value range for color can be saved in a setting file The setting file can be retrieved later Details on setting file are provided in Section 2 1 6 3 Retrieving Time History Response The time history data are saved in a file with an extension of CSV such as ex_dl0b csv Bulletin 5 of Section 4 3 provides details on how to obtain time history data for acceleration and displacement for nodes and stress strain and pore water pressure data for elements 6 4 Regarding Nodal Response for Outcropping Velocity Option base When the Outcropping Velocity Option is used absolute values of displacement and acceleration at all nodes in the finite element model are computed directly by the program and therefore all reported quantities including instant values maximum values and time history data on displacements and accelerations should be interpreted as absolute values hen the Acceleration Option is used the reported quantities on displacements and velocities are relative to the model at Geka ran ads ow na VERSAT S2D and VERSAT D2D Version 20124
43. ow as shown in Figure 4 1 where NPOINT is the total number of acceleration data to be used in the analysis DT is the time interval of the accelerations FAMPL is a linear scaling Select Hori Base Acceleration default under sub window Options for input motions forces When the dynamic analysis starts the program automatically looks for an input file named rui3 ACX to read in time history data of accelerations at the rigid base the input ground motions It is required that the file run3 ACX be created prior to program stops because of incomplete input files factor by which the data are multiplied and Seip Dyramic Run IT c A eT ar input motions forces NBF m ping Open f Hori Base Acceleration ACK Hori Vert Base Acceleration ACHACY spood Tom x0 Forces at Nodal Pons FXY 3 Foo For Ouen Vela Toray number gemen hau Dale an tem Nad Eamon Timo tais Rs Todajelemantno 5 response Sor nade Te viscous damping 3019 3 994 2 2 2 3 E s for saving fo Te Deine Lectin inei S update viscous damping s PWP not generated ako this time sec a D Applying iter Siete send ee ao 2 120007 40000 z
44. ow only shows the part of a model within the X and Y extent defined herein The defined model scale and axis details are saved using Setting under SETTING A setting file can be retrieved next time using Load Setting under SETTING A setting file has a file type extension of log Minimum XE YF Maimun 3 In addition to the Problem Extent and Axis Extent a setting file also saves the following a Font size of text and numbers node and element etc shown on the model b Position font size and content of all texts added through using Draw text command under TOOLS Note Setting file is text file Therefore all items in a setting file font sizes text position color ranges etc can be edited outside the Processor and then re loaded into Processor to take effect 4 The x multiplier and y multiplier is used to scale up or scale down a model by multiplying the X and Y coordinates by x multiplier and y multiplier respectively For examples the multipliers can be used to convert the model between different units Normally they are kept as one ats Gena oe wa VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 5 2 2 Create a Finite Element Mesh The following command may be used in creating a finite element mesh e Select under FILE to start a new problem e Use Finite element node grid points under DEFINE to pre define the four
45. perly on screen Select FILE and choose LOAD OUTPUT to load the output files containing displacements and stresses such as ex_d 0 dis and ex dI0 sig It is noted that the Processor can only load set of results displacements stresses etc to display Therefore the first set of results must be deleted from a DIS file and a SIG file in order to load the second set of results Note The finite element model for ex_d 0 sta is shown in Figure 5 1 More details on showing results of analyses are provided in Section 6 2 X SIMULATION OF THE UPPER SAN FERNANDO DAM DURING EARTHQUAKE OF FER 19 1971 Feste doen nesh showing wa lere Danes Ane X Figure 5 1 Finite element model showing element number and soil zones for ex d10 sta In VERSAT 2D static and dynamic analyses pre existing stresses are always obtained from an input file with an extension of PRX which contains model stresses computed from a previous static analysis and saved in an output file with an extension of PRA for a subsequent static analysis or for a dynamic analysis The PRA file is then renamed as PRX file VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 40 6 INTERPRETING RESULTS OF A DYNAMIC ANALYSIS 6 1 Output Quantities The main output file from a dynamic analysis carries an extension of OUD such as dI0b oud The quantities in the main output
46. this time i e constant with time Enter a large number e g 999 when this restriction is not required ats Gea ran ads ow na NERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 32 gt Static iteration at end of dynamic loads defaultz100 At the end of shaking static equilibrium analyses are carried quantities related to vibrations such as accelerations and velocities are set to zero in this post dynamic static analysis The sub window To modify allows changes to List A C enabled when the model is subjected to dynamic loads instead of ground shaking not used in example run3 dyn and D While the option List A can be requested through the sub window follows is chosen and on time history response of nodes and elements ist of Nodes Elements for Time Histories as gt Click on Add an item and enter node or element no amp response code Repeat above for each pair of node or element amp response code until the required number of response points are entered Notes requested time history data are saved using the file name of the input data and a file extension or file type of CSV such as NicoM_Ic esv run3 csv etc The time history data are compatible with Microsoft Excel Response codes for node response are 1 X displacement 2 X velocity 3 X acceleration 4 Y displacement 5 Y velocity 6 Y acceleration 7 X acceleration at the
47. to see further explanations on the parameter gt See Section 3 4 of the Technical Manual for details of Rr gt See Section 3 5 of the Technical Manual for details of various PWP models mpu Mae paramers Number scis PWP Mo CE sea BeamorTuss Mote Opon s Seeds win nga Sand Mode Shes sng o Reuret stesse Ph using Law C Seeds win CRR m m c amp zeno manic pore waler pressa bw ps 5 sran constants ay Meco sessing Sond Clay IK ps fs gt b pora res Cmm norme a Xs Xs Aes uquetactonisanerirg hem fa FT d br I n m UMW wo mmm kaereh Ahad an A MANE NA WW SAND RI WAMA cz HQ c oi 1 SAND IO 0 1 04 39 0 0 02 025 14 07 AL Ed DYNAMIC ESIC c Kia apa neta ul garen gare Pky nu E cis Deis meri Figure 4 3 A window showing input parameters for a dynamic analysis Gena simal ada oo maT 6 VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual page 36 4 6 Save Data and Start A
48. unbalanced force 52 35 gravity force 0 00 unbalanced 27 53 gravity forca 0 00 unbalanced force 17 gravity force 0 00 Figure 4 4 A window showing a dynamic run in progress VERSAT S2D and VERSAT D2D Version 2012 09 Users Manual pa 4 7 Dynamic Analysis of One Dimensional Soil Column An example of this application is provided in the example library under example 1D 1 Determine static stresses Static stresses are computed from a static analysis of the one dimensional 1D soil column An example ID soil column is shown in Figure 4 5 For the static analysis the boundary conditions of nodes along the two sides are free in vertical displacement i e boundary fixity 1 see Section 2 3 The static stresses are required in order to compute the stiffness and shear strength parameters of the ID soil column in a dynamic time history analysis Follow steps in Sections 4 1 through 4 6 for dynamic analysis of the 1D soil column with the following special treatments For the dynamic analysis the boundary conditions of nodes along the two sides are free in horizontal displacement i e boundary fixity 2 see Section 2 3 Specify Gravity OFF under DEFINE Refer Section 4 2 for this option General parameter etn nea o vs response Figure 4 5 An example 10 soil column showing soil zones a water table and boun
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