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you are right homashanehsaz ;
excuse me,I did not pay attention to the negative sign, i'll check it again and I will let you know if I find the problem.

Thanks dear fmk According to your help, i used A=1[m2] for the beams and then i pushed the frame. Relative displacement of the 4 nodes of the beam (in the x direction) are identical, but the beams still have some axial forces! (although the forces aren't so much) I have another question about this m...

I think some thing is not reasonable the material properties was defined as following: uniaxialMaterial ElasticPP 1 200000. 0.0012 strain=0.0012 length of the element=100 cm so yield deformation=0.0012*100=0.12 cm but you expected from this element following analysis: integrator DisplacementControl ...

Dear fmk and others, please help me kindly
It's important for me!

Hi I want to model a 2D 3-story one-bay steel moment frame by considering of concentrated plastic hinges at the beam ends and bottom of the first story columns.(beam and columns are modeled by uniaxialMaterial Elastic) I modeled this frame as follows: (@: zero length element) 13@14---------beam(floo...