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Thank you Apapaso and Selim.

I performed a pushover analysis in order to find when the base shear becomes zero. The corresponding maximum interstory drift is the collapse drift. The nonlinear dynamic analysis continues beyond the collapse drift and then convergence problems occur.

Thanks for your quick reply. 1- Yes. The periods are close to those reported in the previous works; T1= 0.92 sec and T2= 0.30 sec. 2- No, the problem occurs when the response (Drift/Displacement) is too large. Actually, I want to calculate the residual deformation under different scales of a single ...

I modeled a four-story frame using the Ibarra-Krawinkler deterioration model (including concrete slab contribution / panel zone) and I have faced convergence problems in dynamic analysis! I adopted the adaptive strategy which is introduced in OpenSees Message Board, However, it is not successful. Th...