post earthquake fire modeling in opensees

[Saeedkazemi]

hi , i want to model steel structures under post earthquake fire using time history analysis + thermal analysis with eachother
i want to now is opensees able to model it?
thank you

[fmk]

yes.

[Saeedkazemi]

hello
i downloaded Pushover and Dynamic Analyses of 2-Story Moment Frame with Panel Zones and RBS opensees file but when i run the program for time history analysis after 10 iteration
i see:

Starting OpenSees..

Modified Ibarra-Medina-Krawinkler Model with Bilinear Hysteretic Response

T1 = 0.8057694423072154 s
T2 = 0.18402956002142892 s
Model Built
Running dynamic analysis...
WARNING: CTestNormDispIncr::test() - failed to converge
after: 10 iterations
NewtnRaphson::solveCurrentStep() -the ConvergenceTest object failed in test()
DirectIntegrationAnalysis::analyze() - the Algorithm failed at time 5.574
OpenSees > analyze failed, returned: -3 error flag
Dynamic analysis did not converge
The current time is: 5.573000
please tell me what is the problem?
thanks alot

[fmk]

probably the Bilin model .. it keeps changing and there is nobody to update the scripts that once worked .. try a different material.

[Saeedkazemi]

hi
I have modeled a steel structure to analyze fire after earthquake, Immediately after the earthquake and at the begining of thermal analysis have a sharp jump in outputs (eg the drift of 9th floor suddenly at the end of seismic analysis and at the begining of thermal analysis, increases from 5% to 9% )???????

Second, after the thermal load was applied, when the first member under thermal load collapses, we have a huge shift in outputs For example, if the roof at the time of the collapse of the first element has 50 cm displacement, suddenly In about 5 seconds primary since the collapse will has The displacement of about 150 to 250 cm, i want to know whether this shift is normal or not? Is modeling problem?
thanks a lot