In nonlinear static analysis performed in SAP2000, why the hinge is not following the backbone curve?

25 January 2023 1 3K Report

I am performing a nonlinear static analysis of 1 bay (8 meter) and 1 storey (6 meter) portal frame in SAP2000.

The hinge results obtained are not following the backbone curve provided in the hinge properties as an input. The bending moment value is not dropping.

What are the possible reasons for this kind of behavior?

Abdul Ghafar Wahab

The result is okey, if you want to get same result then use another type of hysteresis model , such as degrading model.

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