Probabilistic Evaluation of Seismic Isolation Effects for a California High-Speed Rail Prototype Bridge
Publication: Journal of Structural Engineering
Volume 145, Issue 11
Abstract
Increasingly, seismic isolation (SI) has been adopted in buildings and highway bridges to mitigate damage from earthquakes. However, its appropriateness in high-speed rail (HSR) bridges remains a topic of major concern for engineers and stakeholders. The effects of SI on the response of HSR bridge systems during future earthquakes need to be evaluated probabilistically accounting explicitly for all uncertainties associated with the seismic loading. To this end, this paper compares the probabilistic seismic responses of a California high-speed rail (CHSR) prototype bridge with and without seismic isolation. The uncertainties in the seismic responses for the isolated bridge and nonisolated bridge are quantified and compared to explore the effects of SI when accounting for the uncertainty of the seismic input. The probabilistic seismic response is evaluated using two alternative approaches, and the less restrictive—but computationally more expensive—approach is selected to quantify the beneficial and detrimental effects of SI for the CHSR prototype bridge. The pros and cons of SI identified in probabilistic terms require a trade-off design in applying SI to HSR bridges.
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Acknowledgments
Support of this research by the Pacific Earthquake Engineering Research Center’s Transportation Systems Research Program under Award No. 1107-NCTRCJ, with Prof. Stephen Mahin (deceased) as the Pacific Earthquake Engineering Research Center director, is gratefully acknowledged. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the sponsors.
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Journal of Structural Engineering
Volume 145 • Issue 11 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Aug 16, 2017
Accepted: Feb 20, 2019
Published online: Sep 10, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 10, 2020
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