Overview of Modal Response History and Modal Response Spectrum Analysis

Seismic Loads ◽  
2020 ◽  
pp. 345-349
Keyword(s):  
Spectrum Analysis ◽  
Response Spectrum ◽  
Response Spectrum Analysis ◽  
Modal Response

Modal Combination in Response Spectrum Analysis of Piping Systems

1986 ◽  
Vol 108 (1) ◽  
pp. 73-77 ◽  
Author(s):  
A. K. Gupta ◽  
J.-W. Jaw
Keyword(s):  
Spectrum Analysis ◽  
Response Spectrum ◽  
Direct Integration ◽  
Response Spectrum Analysis ◽  
Combination Rules ◽  
Combination Methods ◽  
Modal Response ◽  
Piping Systems ◽  
Higher Modes Effect ◽  
Integration Analysis

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.

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