Decoupling of Secondary Systems for Seismic Analysis

[+] Author and Article Information
A. H. Hadjian, B. Ellison

Bechtel Power Corporation, Norwalk, Calif.

J. Pressure Vessel Technol 108(1), 78-85 (Feb 01, 1986) (8 pages) doi:10.1115/1.3264755 History: Received July 20, 1984; Revised April 11, 1985; Online November 05, 2009


Interest in the decoupling of such secondary systems as floor-mounted equipment centers on two decoupled models, the “cascading” model and the “lumped” model. A set of decoupling criteria is derived which addresses both models. The solution is based on the two-degree-of-freedom system. Error in predicted frequency given by each decoupled model is presented. Similar results for response error are derived based on broad-band input to the supporting system. The broad-band input would be applicable to subsystems supported by primary structures. Recommendations are made for extension of the problem to arbitrary multiple-degree-of-freedom systems. The findings of this study will provide the analyst with the information necessary to choose the best decoupled model and will indicate whether decoupling should be attempted.

Copyright © 1986 by ASME
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