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Comparison of Failure Modes of Piping Systems With Wall Thinning Subjected to In-Plane, Out-of-Plane and Mixed Mode Bending Under Seismic Load: An Experimental Approach

[+] Author Affiliations
Izumi Nakamura

National Research Institute for Earth Science and Disaster Prevention, Miki, Hyogo, Japan

Akihito Otani

Ishikawajima-Harima Heavy Industries Company, Ltd., Yokohama, Kanagawa, Japan

Masaki Shiratori

Yokohama National University, Yokohama, Kanagawa, Japan

Paper No. PVP2007-26497, pp. 235-243; 9 pages
doi:10.1115/PVP2007-26497
From:
  • ASME 2007 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • San Antonio, Texas, USA, July 22–26, 2007
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4286-X | eISBN: 0-7918-3804-8
  • Copyright © 2007 by ASME

abstract

In order to investigate the influence of degradation on the dynamic behavior and failure modes of piping systems with local wall thinning, shake table tests using 3-D piping system models were conducted. About 50% full circumferential wall thinning at elbows was considered in the test. Three types of models were used in the shake table tests. The difference of the models was the applied bending direction to the thinned wall elbow. The bending direction considered in the tests was either of the in-plane bending, out-of-plane bending, or mixed bending of the in-plane and out-of-plane. These models were excited under the same input acceleration until failure occurred. Through these tests, the vibration characteristic and failure modes of piping models with wall thinning under seismic load were obtained. The test results showed that the out-of-plane bending is not significant for a sound elbow, but should be considered for a thinned wall elbow, because the life of piping models with wall thinning subjected to out-of-plane bending may reduce significantly.

Copyright © 2007 by ASME

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