I am currently doing my bsc thesis and I need to find the systems stiffness matrix of a beam structure in 3d. I have the element matrix of all the beams but I need to rotate them to the global system. They are only rotated along the z-axis and I know the angles. Everywhere I see people talking about the rotation matrix where Kg = T' * Kel * T. But I can't find a proper description of this T matrix. Can anyone help?
2026-04-02 07:38:40.1775115520
Transformation matrix 3d beam element
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