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Many thanks for all the help. :) However, these axial loads in the beams do have significant impact on the global results. For example: If one runs Example4.1.tcl ( in its current state in the CVS ) after adding the following recorder into the file: recorder Element -file beamGlobalForce.out -time -...

This is definitely needed. We have made some studies in this direction. We analyzed a single cantilever RC column in OpenSees, Ruaumoko, SeismoStruct, DRAIN-2DX and Rechenbrett-2D. We compared both the simulated response under static-cyclic and dynamic loading. The computed maximum displacements wer...

... you are now introducing additional forces that would restrain axial deformation. I would just release this deformation and allow the beam to extend, as it is supposed to.... A " rigidDiaphragm " constraint has to be defined for simulating the response of a typical RC Moment-Resisting ...