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Hi,
I am working on a high rise building. I get a wrong stress strain response for confined concrete once I defined the RectangularFiberSection for the column. Can you help me with this issue? I have attached the file.
Thank you in advance!

Check this post:
viewtopic.php?p=10365&hilit=Rectangular ... ion#p10365

Dear STKO Team,
I have already replaced those files. However the same error is occuring. Also this error is occuring when I run the model.

StaticAnalysis::analyze() - the Algorithm failed at step: 0 with domain at load factor 1
OpenSees > analyze failed, returned: -3 error flag
Reducing increment factor due to non convergence. Factor = 0.5
WARNING: numeric analysis returns 1 -- Umfpackgenlinsolver::solve
WARNING NewtonLineSearch::solveCurrentStep() -the LinearSysOfEqn failed in solve()
StaticAnalysis::analyze() - the Algorithm failed at step: 0 with domain at load factor 0.5
OpenSees > analyze failed, returned: -3 error flag
Reducing increment factor due to non convergence. Factor = 0.25
WARNING: numeric analysis returns 1 -- Umfpackgenlinsolver::solve
WARNING NewtonLineSearch::solveCurrentStep() -the LinearSysOfEqn failed in solve()
StaticAnalysis::analyze() - the Algorithm failed at step: 0 with domain at load factor 0.25
OpenSees > analyze failed, returned: -3 error flag
Reducing increment factor due to non convergence. Factor = 0.125
WARNING: numeric analysis returns 1 -- Umfpackgenlinsolver::solve
WARNING NewtonLineSearch::solveCurrentStep() -the LinearSysOfEqn failed in solve()
StaticAnalysis::analyze() - the Algorithm failed at step: 0 with domain at load factor 0.125
OpenSees > analyze failed, returned: -3 error flag
Reducing increment factor due to non convergence. Factor = 0.0625

Can you please help me to solve this problem. I have attached the model here.
Thank you in advance!

I have already replaced those files. However the same error is occuring. Also this error is occuring when I run the model.

Now the error is different: you are using positive values for concrete strain and negative values for stresses. While OpenSees now converts all of them to negative values, the Automatic Confinement tool expects those values to be ALL NEGATIVE. Just make them negative

WARNING: numeric analysis returns 1 -- Umfpackgenlinsolver::solve

This error instead is due to a singularity. From a quick check of your model I can see that the last 7 geometries in your model are not connected to anything. Double check your model