|Dec14-12, 01:48 PM||#1|
MAxwell reciprocal theorem and symmetric stiffness matrix
As per Maxwell reciprocal theorem, it is valid only for elastic materials and structures indergoing small displacements.That is k12 = k21, kij = kji hence stiffness matrix is symmetric.
Howbver, I just have been going through MY OWN written programs for geometric non linear problems and I observe that stiffness matrix (assembled stiffness matrix) is well symmetric.
How can stiffness matrix be symmmetric for non linear behaviour of structures?
|Dec14-12, 02:27 PM||#2|
Perhaps if you posted an example?
What elements do you have in your matrix?
kij is just a constant and therefore linear.
|Dec15-12, 10:45 AM||#3|
I have beam elements in my matrix. It is a cantilever beema with end moment.
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