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I have two cantilevered column models with one difference, one uses a beamWithhinges, and the other uses a nonlinearBeamColumn. The loading is a simple point load at the free end. The resulting stiffness should be 3EI/L3, which is close to what the beamWithHinges provides but not exact, and differen...

I have a 3D steel frame. All beams are beamWithHinges, all columns are nonlinearBeamColumns. I am trying to implement Rayleigh damping. When I use just the mass proportional term, good results. When I add stiffness proportional terms, I get messages to the effect of: incompatible member forces and d...