For a linear elastic structure with reciprocal behavior, which property does the assembled global stiffness matrix usually possess?
Correct answer: A. It is symmetric about its main diagonal
- A. It is symmetric about its main diagonal
- B. It contains only positive off-diagonal terms
- C. It remains unchanged after removing a support
- D. It has identical values in every row
Explanation
Reciprocity makes the stiffness coefficient Kij equal to Kji, so the global stiffness matrix is symmetric. The signs and magnitudes of individual off-diagonal terms can vary, so they need not all be positive or identical.
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