Hello, I have a problem in ANSYS workbench when modelling a 3D steel building, aiming to have pinned joints in a direction + bracing, and fixed/semi rigid joints in the other direction. After identifying all the joints, with torsional stiffness = 0 for the pinned connections, the model didn't work and showed me the error of a problem with DoF and that there is under/ill constraints. I tried to change them to fixed and it worked. Then I made them revolute again but with different values of stiffness, the bending moment doesn't change for this direction whatever value of stiffness I insert. For the other direction it works totally fine. And I tried the pinned connections for a 2D model and it also worked fine. So, I can't really find a clue about the reason for the error.