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Hello community, I have to do a beam analysis (see figure_1) but I don't know how to create a pin-joint in HyperMesh. I have tried to use the joints panel in the 1D main menu page. Then I have selected the revolution joints type, because this joint type will constraint 5 dofs and will leave one rotational dof open. This is exactly what I want. I have selected the two terminal nodes [Grids 5 and 6 (1000;0;0)] and switched first orientation vector to z-axis (figure_2). But it did not work because when solving the problem there is an error message: *** WARNING # 312 In static load case 1 the compliance is negative or large 2.545087E+11 Optimization/buckling analysis cannot be performed due to possible rigid body mode What did I do wrong? Or is this not the right way to create such a pin-joint for this type of analysis? Thanks in advance Nahid