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Element Stiffness Matrix

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The element formulation accounts for Dx, Dy and Dz of the local coordinate system.  The element stiffness matrix is based on isoparametric compatible or incompatible formulation [Ref 1, 2, 3].  Therefore, the stiffness matrix is of size 24 by 24.  Full two by two numerical integration is used to calculate the stiffness matrix.

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