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I reduced the dimension of the problem in a 2D space and changed the type of "constraints" and "system" and it worked. I can run the model now and get some outputs. However, the nodal response at node 2 (the free end of the element) shows zero displacements, whereas I imposed sin...

Dear mhscoth

Thanks for your reply. I fixed that, however, I got the following warning that seems to be serious as it won't let the program continue.

WARNING TwoNodeLink::setUp() - element: 1
no local y vector specified

Any comments?

Dear friends, I am trying to simulate a viscous damper's experimental load-displacement hysteresis loops. The damper is subjected to a sinusoidal displacement with a given amplitude and frequency. I have written the following code. However, I am unsure what is wrong with it as the analysis is not pe...