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[quote="msa_imeg"] I do this , I edit FullGenEigenSOE , FE_Element , DOF_Group Classes I can upload My file if you want ![/quote] Hello! I need to get the global stiffness matrix but actually I don't manage quite well the source code. I'm looking into BandSPD to get the A matrix but I woul...

Hello Juan and everybody : I’m a beginner in Opensees and I have also the same question about local axes, however, from the local forces of some 2D examples that I’ve performed before I’ve seen that local axes in beams and columns seem follow this rule: x-local axis lies in the axial direction, from...