Response Spectrum is a plot of the peak or steady-state response (displacement, velocity or acceleration) of a series of oscillators of varying natural frequency, that are forced into motion by the same base vibration or shockġ3 3. Response Spectrum Analysis Purpose of RS analysis: Dynamic analysis of a structure subjected to earthquake excitation using the response spectrum. The response spectrum analysis uses the natural periods from the eigenvalue analysis.ġ2 3. Eigenvalue analyses must precede dynamic analyses such as Modal Time History analysis or Response spectrum analysis. Eigen Value Analysis Step 2: Eigen Value Analysis Results A) Natural modes (or mode shapes) B) Natural periods (or frequencies) C) Modal participation factors. Eigen Value Analysis To convert the final stage Cable forces to be used for determining cable stiffness for the Eigen Value Analysisġ1 2.
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