Thanks for pointing that out, I am aware on how to use them. I was looking more into the mechanical background, how does Sofistik compute out of plane shear forces parallel/perpendicular to the section? I assume it takes vx and vy on an element basis, computes the angle between the coordinate systems, and then… ? For membrane forces and bending moments I can imagine that traditional methods of tensor rotations are applied. If you can point me to any source that would be highly appreciated.
Thanks,
Daniel