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I am developing a model of a concrete frame. However, when introducing the RCJointModel3D, the model encounters problems. I observe that the deformations tend to move out of plane, and I cannot determine the error. Please, could you help me with any suggestions? Thank you!

Try this: Issues:

• Penalty is required for the joint model (it has overlapping MP constraints). However, if you don't put a custom analysis before the eigen command, it will use the default Transformation handler. Here I used a dummy analysis (zero duration, zero increments, just to setup the analysis settings, AND WITHOUT the wipeAnalysis, so that these settings will be used by eigen)
• Penalty 1.0e18 is too high for your model, I used 1.0e14.
• When the model is large and you use Penalty it's better to use the default genBandArapck solver for the eigenvalue command
• Last error: in a DisplacementControl analysis the target displacement cannot be 0

Thank you very much for your response.

You're welcome