I tried .stl but fixing .stl model is a big project in itself. One thing that I did is I took the solution and entered into a new analysis as below:
However, the beam elements twist when I entered the model from one analysis (Step 1) into another (Step 2):
the beam elements are connected to a few shell elements. the shell elements come to the 2nd step of the analysis very good but the beam elements twist and rotate.
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