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Thanks for the very informative answer. But still there is a question left: "Using Opensees (nonlinear beam column with corotational transformation), you handle the problem of geometric nonlinearity more precisely..." Well, is that really only true for the combination of the nonlinearBeamC...

Either with an elasticBeamColumn element and two zeroLength elements at the ends or better with the beamWithHinges element. For more information see the examples manual: http://opensees.berkeley.edu/OpenSees/manuals/ExamplesManual/HTML/ or the user manual: http://opensees.berkeley.edu/OpenSees/manua...

If you use a zero length element and like to record force and deformation for element numbers 4 and 5: recorder Element -file NameOfOutputFile.out -time -ele 4 5 force recorder Element -file NameOfOutputFile.out -time -ele 4 5 deformation If you use a zero length section element: recorder Element -f...

I’ve got a question how OpenSees is handling PDelta effects. The manual only says that a (linear) geometric transformation of beam stiffness and resisting force from the basic to the global coordinate system is performed. Is that the same what Drain 2DX is doing? (As far as I know Drain 2DX is addin...