Study of Elastoplastic Bridge Seismic Isolation System
Publication: Journal of Structural Engineering
Volume 123, Issue 4
Abstract
Seismic isolation bearings consisting of lubricated sliding bearings and steel dampers exhibit nearly elastoplastic behavior. Accordingly, they can transfer force to bridge substructures which is independent of the level and frequency content of seismic excitation. While this is a desirable property, it is achieved at the expense of potential for development of significant permanent displacements. This paper reports on a study of one such system that consists of E-shaped steel dampers and which found a number of applications in bridge seismic isolation. The paper demonstrates that indeed significant permanent displacement develop, particularly in earthquakes with shock-loading characteristics. Moreover, the paper demonstrates the significance of restoring force in isolation systems and concludes that the current American Association of State Highway and Transportation Officials (AASHTO) design guidelines for these systems are appropriate.
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 123 • Issue 4 • April 1997
Pages: 489 - 498
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Apr 1, 1997
Published in print: Apr 1997
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