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I am trying to write a MATLAB script to do an elastic analysis of 3D frame sturctures. The method I am using is the direct stiffness method, but I cannot find the equations for the 12x12 stiffness matrix for each member in the global system.

If anyone has any information on 3D matrix analysis I would greatly appreciate the help. So far none of the texts I have found have explicitly given these formula.

I have the 6x6 matracies for 2D analysis if anyone is interested.

Thank You

Elbarto

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# Structural Engineering -12x12 stiffness matrix analysis

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