The method is in this link:
The matrix is this one below. I constrained the external nodes in UX, UZ, ROTX, ROTY, so I should have a 4x4 matrix, but with the third node I got a 10x10. And one thing weird is happening as well. When I get the Mass matrix, the are values equal to zero, what should not happen. If you have any suggestions about this too, would be great.
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