The OpenSees Community

Dear Silvia I have another question. I want to model a SDOF structure resting on the soil layer. I want to define a damping ratio of 0.05 for the elastic beam-column element. But, I couldn’t find the exact way. Is it possible in OpenSEES? The only option that I could find for defining of damping is ...

I forget to write that I use version 1.7.3.

Dear Silvia I analyze a soil mass model under earthquake loading which is very time-consuming. I need to restart the analysis from the last step in the case of any interruption in the analysis process. I tried to use “restore” command but I couldn’t (or it may not work). Please, help me in this rega...

Hi
I build a dynamic two-phase model that during analysis the following error occures:

UMD2FA: LVALUE too small! Must be greater than 17047040
WARNING UmfpackGenLinSolver::solve(void)- -4 returned in factorization UMD2FA()

Please help me to find the origin of this error.

Sincerely
Shahir

Dear fmk I followed the analysis process and found that the error is occurred in the “Jacobian3D” function. In this function during the execution of the “new” command for building of the coordinates tensor, the error is occurred and the program is terminated. It is interesting that the error is obse...

Dear fmk
I downloaded it from the current webpage (version 1.7.3).
Best regards

Dear friends I analyzed an example (nonlinear seismic) in two ways: 1. Using downloaded OpenSEES.exe (version 1.7.3). 2. Compiling OpenSEES (version 1.7.3) with VC6 and using the new built OpenSEES.exe The first analysis is finished successfully up to the last step (25000) but, the second analysis f...

Dear Boris
May I send the input file for you to take a looke in it?
Best regards
Shahir

Dear Boris
I tried your recomendation but it does not work! An unknown error occures at the start of analysis and terminates the running of program.
Best regards
Shahir

Dear Silvia I am going to analyze a two-stage model (gravity and seismic stages). I wanted to change the material model at the end of gravity stage but fmk said me that I can't do it using OpenSees. I want to know is it possible to change a parameter of material model (Poisson's ratio) at the end of...

Dear fmk
I have another question.
can I change a parameter of material model (Poisson's ratio) during analysis (at the end of gravity analysis step)?
Best regards
Shahir

Dear fmk
Thank you for you reply.
Best regards
Shahir

Dear Silvia
I want to analysis an example with 2 steps: gravity & seismic excitation. The material model and boundary conditions are different in these steps.
How can I change material model and boundary conditions at the end of gravity analysis step?
Best regards
Shahir

Dear FMK
Thanks for your attention. I'm really interested to apply version 1.7.3.
Best regards
Shahir

Dear Silvia
I checked the source browse and find some updates in the upU element and Template3Dep material. I want to know when the new version of opensees.exe (including these modifications) will be uploaded?
Thank you in forward.
Best regards
Shahir