CANDE-2015 INSTALLATION AND GUIDANCE CONTENTS
Contents
1. B 6 2 6 2 7 Link elements with death option Two simple options are 1 connect any two nodes with a pinned connection or 2 connect two beam nodes with a fixed moment connection The link element death option is an extremely useful capability allowing the removal of any link element and its forces at any specified load step Also a special composite joining option for beam groups 2013 5 5 6 4 C 4 and if composite 5 6 8 D 2 4 11 to 4 15 Deeply corrugated steel structures Updated steel pipe type to accommodate the recently adopted AASHTO requirement for a combined moment thrust design criterion that applies to deeply corrugated steel structures as well a new AASHTO equation to predict the global buckling resistance These new design criteria may be activated at the user s discretion 2013 5 5 4 1 B 1 and 5 5 42 B 2 2 2 2 Plastic pipe type variable profile properties The plastic pipe subroutine has been revised to allow variable profile geometries around the structure This applies to all types of plastic including HDPE PVC and PP Useful for analyzing storm water chambers 2013 5 4 3 4 B 3 B3b 2 4 3 Mohr Coulomb plasticity model The classical Mohr Coulomb elastic perfectly plastic model is now included in the suite of available constitutive models that may be assigned to continuum elements to describe soil behavior Four material parameters are required to define the2. above 3 5 2015 version with greatly improved convergence algorithms for Mohr Coulomb and Modified Duncan Selig soil models Peace of Mind Do not worry You can easily recover the old CANDE program by re visiting the TRB website and downloading CANDE 2007 with the 2011 upgrade Or you save the previous CANDE 2013 DLL prior to replacing it with the CANDE 2015 DLL 2 WHAT IS CANDE 2015 CANDE 2015 is the latest in the series of CANDE computer programs which date back to 1976 and is dedicated to the structural design and analysis of buried culverts The 2015 version of CANDE is an extension of the AASTO TRB version CANDE 2007 2011 with seven new capabilities listed below l Q amp A CONRIB pipe type This is a new pipe type in CANDE 2015 with modeling capabilities for rib shaped reinforced concrete cross sections Also the concrete stress strain model has the ability to model fiber reinforced concrete Industry sponsor Con Span Bridge Systems CONTUBE pipe type This is another new pipe type added to the pipe library that permits modeling circular shaped concrete cross sections encased in fiber reinforced plastic tubes spaced at uniform distances Industry sponsor Advanced Infrastructure Technologies Link elements with death option Links are useful for connecting one beam element group to another in either a pinned connection or fixed moment connection Also the link element offers a death option that allows simulating strut remov
3. model E v c and g 2015 5 6 9 D 2 3 7 3 8 Modified Duncan Selig soil model The new modified Duncan Selig model produces permanent deformations upon unloading similar to advanced plasticity models No new material parameters are introduced into the new formulation thus the existing data base of Duncan Selig parameters remains valid for the modified formulation The user has the option to use either the Original or Modified version 2015 5 6 4 1 D 2 3 58 to 3 59 3 8 4 USING THE GUI WITH CANDE 2015 The graphical user interface GUI works with CANDE 2015 in exactly the same manner as it works with the original CANDE 2007 2011 program except for utilizing the new capabilities developed after 2007 When dealing with any of the following new capabilities e CONRIB Pipe Type e CONTUBE Pipe Type e Link elements e Deep corrugation design criteria for Steel Pipe Type Variable Profile geometry for Plastic Pipe Type Mohr Coulomb elastoplastic soil model e Modified Duncan Selig model with plastic like behavior it must be understood that the GUI input wizard is unaware of these options Consequently to utilize these new capabilities the input data must be entered in the batch mode That is from the File menu on the CANDE screen select Open text input and refer directly to the input instructions in Chapter 5 of the CANDE 2015 User Manual to enter the required data The GUI has two facets pre pro
4. CANDE 2015 INSTALLATION AND GUIDANCE CONTENTS 1 INSTALLATION INSTRUCTIONS 2 WHAT IS CANDE 2015 3 NEW CAPABILITIES AND REFERENCES 4 USING THE GUI WITH CANDE 2015 1 INSTALLATION INSTRUCTIONS FOR CANDE 2015 Purpose The purpose of this instruction is to install the new CANDE 2015 DLL dynamic link file named cande_dil dll into the CANDE executable folder containing the CANDE 2007 program with the 2011 upgrade The new DLL which replaces the old DLL with the same name contains new executable logic for all enhancements to CANDE since 7 31 2011 which is the last TRB NCHRP release date Instructions to install new DLL 1 Locate the CANDE executable folder currently in your computer usually stored in the directory Program Files or Program Files x86 The default folder name is CANDE 2007 even though it contains the 2011 upgrade 2 Right click the new DLL cande_dll dll accompanying this instruction and obtain a copy 3 Open the executable folder CANDE 2007 and paste the new DLL into the file Answer yes to the question Do you wish to replace old cande_dll dll with new 4 That s it You re ready to go Verification After you run any CANDE input file you may verify that you are using the new executable program by observing that the first line of output says WELCOME TO CANDE 2015 version 3 5 2015 Note the previous version 1 30 2015 has been replaced with the
5. al culvert erosion and creation of soil voids Industry sponsors Contech Construction Products and MGK Consulting Deeply corrugated steel structures CANDE s corrugated steel pipe type now includes the new AASHTO combined moment thrust design criterion and new global buckling equation for deeply corrugated steel structures Also the plastic penetration algorithm has been improved Industry sponsors Atlantic Industries and Contech Construction Products Variable plastic profile properties The input data defining plastic profile section properties has been expanded to allow variable profile geometry around the pipe s periphery This is useful for arch shaped storm water chambers that vary the plastic profile geometry from top to bottom Industry sponsors Advanced Pipe Services and Prinsco Classical Mohr Coulomb elastic perfectly plastic model This traditional elastoplastic model is now included in the suite of available constitutive models that may be assigned to continuum elements to describe soil behavior Industry sponsors Contech Engineered Solutions and MGK Consulting Modified Duncan Selig soil model A modified version of the Duncan Selig model is now available which produces permanent deformations upon unloading similar to advanced plasticity models No new material parameters are introduced into the new formulation thus the existing data base of Duncan Selig parameters remains valid for the modified formulation Industry sponsor
6. capabilities If there is more than one pipe group the user identifies the pipe type by its unique group number Similarly the user identifies link elements versus interface elements by the unique element number and soil models with unique material numbers Graphs The GUI graph plotting option is dedicated to viewing structural responses of any pipe type group wherein the plot data is obtained from another XML plot file developed for the GUI Using the same alias names noted above each CONRIB and CONTUBE pipe type group number is labeled as a CONCRETE group number Therefore using the CONCRETE label with unique pipe group numbers the CONRIB and CONTUBE structural responses may be plotted just like any other pipe type Hint If the Graph option does not seem to work rerun the input file under then Open option instead of the Open Text Input option
7. cessing and post processing Pre processing is concerned with creating input data files and post processing deals with viewing the output files and graphically plotting the finite element mesh and structural responses Both facets are discussed below with regard to how they interact with the new capabilities listed above Creating Input Files pre processing The GUI interface menu offers two basic modes for creating an input data file as listed below 1 Traditional batch input choose File Open Text Input 2 Menu driven input choose File New Mixing these two input methods is the easiest way to generate an input file that incorporates any of the new capabilities For example suppose we want to create an input file utilizing the CONRIB pipe type The Menu driven input screen does not have a selection choice for the CONRIB pipe type however we can choose the CONCRETE pipe type as a temporary surrogate After all the remaining menu driven input data is complete and the entire data file has been saved and stored we reopen the data file with Open Text Input and refer to CONRIB pipe type in Chapter 5 of the CANDE 2015 user manual to replace the input lines of the surrogate pipe data with the required CONRIB input data Said another way this second step is a mini batch mode input process only changing a few lines of input The above process also applies to CONTUBE Note that the GUI generated line tags ending with double exclamation ma
8. e Output Report Mesh plots The GUI mesh plot viewing option which allows plotting finite element mesh topology as well as displacements and soil stress strain contours is fed by a XML plot file developed especially for the GUI Consequently the words CONRIB CONTUBE or Link do not appear in the input or output screens for selecting data to be plotted Instead the generated XML plot files have been assigned alias names as follows e Each CONRIB pipe type group number is labeled as a CONCRETE group number e Each CONTUBE pipe type group number is labeled as a CONCRETE group number e Each link element is labeled as an interface element with its unique element number When mesh elements using the Mohr Coulomb soil model are clicked on screen the soil model name is shown as Hardin which is a surrogate name borrowed from an old legacy soil model still available in CANDE 2015 However the actual soil model is easily verified by checking the element s material number with the soil model information printed in the output report Similarly if the element s soil model is identified as Duncan or Duncan Selig the distinction between the original and modified formulation is easily verified by checking the element s material number with the soil model information printed in the output report With the above understanding the new pipe types link elements and soil models have full access to the GUI plotting
9. for the surrogate soil model and enter the Mohr Coulomb data following the directions for lines D 1 and D 2 in the user manual In summary this two step process of generating menu driven input data followed by a mini batch mode correction is a very effective way of creating input files for all the new capabilities Viewing Output Files post processing After a successful CANDE run the View tab on the GUI tool bar includes the viewing options listed below e Output Report CANDE e Mesh Plot e Graphs As discussed next these viewing options have different implications with regard to displaying the output from the new capabilities Output report CANDE The Output Report which is the most important document is a complete print file generated by the CANDE 2015 program and is navigable by means of an interactive table of contents Since the table of contents and the printed output is generated directly from the CANDE 2015 Engine there is no loss of data or ambiguity with regard to the new capabilities For example the table of contents identifies these capabilities by name such as CONRIB CONTUBE and Link just as it does with all other pipe types and element types Similarly the output identifies the Mohr Coulomb model and parameters by name as well as which version of the Duncan Selig soil model is employed Original or Modified Therefore the new capabilities are displayed perfectly and seamlessly with regard to viewing th
10. rks for the surrogate CONCRETE pipe type such as B 1 Concrete can be removed so that CONRIB or CONTUBE input data begins in column 1 in accordance with the CANDE 2015 User Manual As another example consider creating a Level 3 input file incorporating link elements From the element input instructions in Chapter 5 C 3 lines we observe that the link element nodal connectivity is defined exactly like an interface element so that we may use the interface element as a surrogate to enter nodal connectivity in the Menu driven screens Later when we switch to Open Text Input the special link element connection code and death option may be typed in the specified columns Menu driven input for the Modified Duncan and Duncan Selig soil models is straight forward because no surrogate name is needed We simply select the original Duncan Selig model ITYP 3 and supply data in the usual manner whether it be canned soil parameters like SW90 or USER defined parameters Next we switch to Open Text Input and insert one new data entry NEWDS 1 as described on line D 2 of the Duncan and Duncan Selig input data in the CANDE 2015 User Manual If this new data item is not entered the Original formulation is employed Finally for the new Mohr Coulomb elastoplastic model ITYP 8 the linear elastic soil model ITYP 1 may be used as a surrogate in the Menu driven input screen After switching to the batch input mode we remove the GUI generated line tags
11. s Contech Engineered Solutions and MGK Consulting Who sponsored the new capabilities New capabilities and improvements in CANDE 2015 are provided gratis as a result of the industry sponsors noted above Does CANDE 2015 work with all old input files YES All input files that worked with CANDE 2007 2011 or CANDE 2013 will work the same way with CANDE 2015 How do I use the new capabilities The CANDE 2015 User Manual provides complete batch mode input instructions for the new capabilities written in red ink The GUI input menu is not updated for the new capabilities see the discussion at the end of this document for working with the GUI 3 NEW CAPABILITIES 2015 AND REFERENCES Description of new capabilities in CANDE 2015 User Manual Chapter 5 Section number and line marker Solution and Formulation Manual Section No CONRIB pipe type CONRIB has been added to CANDE s pipe type library that provides the capability of modeling rib shaped reinforced concrete cross sections as well as standard rectangular cross sections Moreover the concrete constitutive model has been extended to include the simulation of fiber reinforced concrete 2013 CONTUBE pipe type This special pipe type provides the capability of modeling circular shaped concrete cross sections encased in fiber reinforced plastic FRP tubes spaced at uniform distances 2013 5 3 2 A 2 and 5 4 5 B 1 to B 6 5 3 2 A 2 and 5 4 6 B 1 to
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