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FEA- Catia, rigid connection between beams


Hello, I am new to the FEA module of Catia and I am getting mad. I have a truss-like assembly of beams. I modeled them in the FEA module as linear elements. Now I would like to rigid connect them at their end vertexes and whatever mode I try, something gets wrong on the way and I either cannot create the connection or the connection propriety. At best, I would like to reuse the point-point coincident constraints that I already made when assembling the product. Any help would be appreciated!!