Modal Combination in Response Spectrum Analysis of Piping Systems

[+] Author and Article Information
A. K. Gupta, J.-W. Jaw

Department of Civil Engineering, North Carolina State University, Raleigh, NC 27695-7908

J. Pressure Vessel Technol 108(1), 73-77 (Feb 01, 1986) (5 pages) doi:10.1115/1.3264754 History: Received October 13, 1983; Revised March 08, 1985; Online November 05, 2009


Modal combination methods in the response spectrum analysis of piping systems have been investiaged. Two particular effects are identified, viz, (i) the residual rigid response, also known as the higher modes effect (HME); (ii) the correlation between the modal response and the rigid response. Gupta’s method accounts for both these effects. It is shown that Gupta’s method gives results which are much closer to the direct integration analysis results than are the results obtained from any other modal combination rules which ignore either one or both of the foregoing effects.

Copyright © 1986 by ASME
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