moment curvature curve after gravity analysis

[sreyadhar]

In fiber based nonlinearBeamColumn element to model a cantilever RC column, why the moment-curvature curve passes very near to zero curvature after staged gravity analysis? How is it possible due to axial load contribution, the member is carrying huge moment and the curvature is very near to zero?

[selimgunay]

For the gravity analysis, assuming that there is no yield or cracking, moment/curvature should be equal to EI. Does that approximately hold for your analysis results?

[sreyadhar]

Yes, that is true. But how come the moment-curvature path is same in loading and loading in dynamic analysis performed after staged gravity analysis near origin (0,0) of a plot?

[selimgunay]

You may be applying a low level ground motion. Please check your scale and units