14. CALCULATION OF STIFFNESS AND MASS ORTHOGONAL VECTORS LDR Vectors are Always More Accurate than Using the Exact Eigenvectors in a Mode Superposition Analysis
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چکیده
The major reason to calculate mode shapes (or eigenvectors and eigenvalues) is that they are used to uncouple the dynamic equilibrium equations for mode superposition and/or response spectra analyses. The main purpose of a dynamic response analysis of a structure is to accurately estimate displacements and member forces in the real structure. In general, there is no direct relationship between the accuracy of the eigenvalues and eigenvectors and the accuracy of node point displacements and member forces.
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