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Dear STKO Team

Hi

I leave a question because I want to solve the error that appeared in the analysis, and this problem seems to have something to do with property. It was confirmed that the section or material was entered correctly.
I raised iteration to 1000, but the same error occurs.

Thank you for reading!

Dear user,
if you share your model with us we will help you to solve the problem.
Thank you

Dear STKO Team

Thank you for your help I can finished pushover analysis succefully!
Since then, I 've been doing transient analysis by adding earthquakes, and still the same error occurs.
I changed algorithm to Krylov , test to NormDisp, increased value of minmax material and the value of dt into smaller ones as you advised, but the same error appears.
The model of bridge I used is base on consists of several tcl files and there is no error in interpreting this model in Opensees.
I I work by extracting the material value of the model from the tcl file and proceed with the construction of the bridge in stko.
As you all know after run the analysis in stko, several tcl files are created.

The same error occurs when I change properties of modeling in Opensees to extracted properties in the STKO's tcl file. Perhaps there is a problem with modeling, but the modelling properties of stko and the modelling properties of the openses file are set the same.

In the end, STKO also expected the same result since it is post-processing in Opensees, but it is embarrassing because it is not.

Could you help me?

Dear User,

If your hand-written TCL files run well in OpenSees, and those generated by STKO do not, it means that in STKO you did not model it in the same way. Unfortunately it is very difficult for us to understand where those differences are (you are the one who knows what you want to do in your analysis).

From a first look at your tcl file (only part of the model) already the first elastic section is different from what you defined in STKO, probably there are other major differences somewhere else.

In particular I see a very strange behavior: if the initial time step is 0.005 s, the analysis runs up to 1.12 s.. Then if I reduce the time step, it stops even earlier (which is strange because a smaller dT should help)

I think there is something wrong in the connection between the columns and the deck. Have a look at the element.tcl file generated by STKO to understand if you did something wrong.

Another thing that you can do, is to replace all your nonlinearities with linear components (for example, elastic uniaxial materials for fiber sections, elastic springs for isolators, and so on...). Then you do a first linear analysis. It will help you understand if the model is correct (if you obtain reasonable elastic displacements). Then start adding nonlinearities 1 by 1... Then you will be able to spot the error

Dear STKO Team

Thank you for your kind advise!
I will try to fixing what you mentioned in the reply.