The Influence of Higher Modes and Support Gaps on the Seismic Response of Piping Systems Containing Snubbers

[+] Author and Article Information
O. A. Abu-Yasein, C. Lay, M. A. Pickett

Department of Civil Engineering, College of Engineering, University of Toledo, 2801 W. Bancroft Street, Toledo, OH 43606-3390

J. Madia, S. K. Sinha

Consolidated Edison, New York, NY

J. Pressure Vessel Technol 119(4), 444-450 (Nov 01, 1997) (7 pages) doi:10.1115/1.2842328 History: Received December 01, 1994; Revised June 05, 1997; Online February 11, 2008


In this study of flexible piping systems (0.6 to 6.6 Hz), it was shown that the fundamental mode was not always the most significant mode of vibration. This study also concluded that variations in support condition do not significantly influence response in terms of nodal stress, fundamental frequency, and contribution of higher modes. In terms of support stiffness, the ratio of the magnitude of the gap (the total of all the mechanical tolerances and deadbands in the snubber support system) to the magnitude of the support nodal displacement was found to be more important than the actual magnitude of the gap. Additionally, when the magnitude of the nodal displacement exceeded the gap magnitude by a factor of about five or more, support stiffness was found to remain relatively constant.

Copyright © 1997 by The American Society of Mechanical Engineers
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