Hi, I built an OpenSees model to simulate the seismic behavior of cold-formed steel-framed gypsum partition walls.
The tested specimen, composed by 2 horizontal tracks and 7 vertical studs, as well as gypsum panels on both sides, was attached both at the top and bottom at concrete slabs able to move and apply to it a displacement history. The model is quite detailed, with all the connections implemented (stud to track, track to concrete, gypsum to stud, gypsum to track), but still I’m not able to get close to the experimental hysteretic curve.
I think that the model is correct in terms of geometry and material properties, so maybe the error could be in the analysis or in the way I apply the load.
I know that I have to apply a displacement history on OpenSees but how to correctly do that? Where do you think I should apply the load and which node I should take as controlNode for the analysis? Do I have to consider also gravity loads even if it’s a quasi-static analysis? Which types of recorders should I set?