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Asra, did you ever figure out how to get this particular program to work?

I am comparing the dynamic response of a structure (steel special moment resisting frame) w/o a damper and w/ a damper. The damper goes diagonally from one node to another in the bays of the frame. The method in which I have modeled the damper appears to be incorrect as the results are the same for ...

I am using viscous material to model a damper. When defining the viscous material, does anybody know what the damping tangent ($C) and tangent ($alpha) are? Thanks!

silvia wrote:the truss will not take those moments.
if you have all trusses, change to ndf=2

Can you send me your program