UTILITIES, RESPONSE SPECTRUM ANALYSIS

UTILITIES, RESPONSE SPECTRUM ANALYSIS

The RESPONSE SPECTRUM ANALYSIS panel is intended for use in a seismic analysis to combine the multiple modes of a structure into one mode, so that the total response of the structure can be seen. Two methods of combination are available in D3Plot; the Square Root Sum of Squares (SRSS) and the Complete Quadratic Combination (CQC) method.

In order to calculate the combined mode, the user needs to supply the following information in the pane, shown below:

1. Time Period vs. Acceleration curves, for at least one translational degree of freedom, defining the acceleration spectrum. See RESPONSE SPECTRUM ANALYSIS Time Period vs. Acceleration curves .
2. The eigout output file produced by Dyna, containing the participation factors for each mode. See RESPONSE SPECTRUM ANALYSIS Eigout File .
3. The combination method to use. See RESPONSE SPECTRUM ANALYSIS Combination Methods .
4. How the new mode is output. See RESPONSE SPECTRUM ANALYSIS Output