Navigation:  Calculation Modules > Analysis > ENERCALC 3D > Members > Elastic Stiffness Matrix

Last revised: Thursday, January 29, 2026 at 02:58 PM

Total number of DOFs of a member is the summation of DOFs of the two nodes.  Therefore, for a 3D beam, the stiffness matrix is of size 12 x 12.  The elastic stiffness matrix in the local coordinate system with shear deformation is given [Ref. 8] as follows:

 

 

where: ; ;   ; ;