Performance of a Seismically Isolated Bridge under Near-Fault Earthquake Ground Motions
Publication: Journal of Structural Engineering
Volume 130, Issue 6
Abstract
A bridge with lead-rubber seismic isolation bearings was field-tested to evaluate the assumptions and uncertainties in the design and construction. A numerical model was established based on satisfactory predictions of the dynamic characteristics under ambient vibration, free vibration tests, and the seismic performance under the 1022 Gia-Yi earthquake. Parametric studies of this model, under simulated near-fault ground motions, were carried out to investigate the near-fault effect. Two types of velocity pulse that characterize the near-fault effect were investigated. Results revealed amplified seismic response when the pulse period was close to the effective period. The response amplification by a longer period pulse was not consistent for the two pulse types. Additional observations included the ratio of dissipated energy by the lead-rubber bearings to the total input energy, which could be influenced by the near-fault effect. Variation of the near-fault effect due to a change of structural parameters was studied to provide information on possible mitigation strategy.
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References
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Information
Published In
Journal of Structural Engineering
Volume 130 • Issue 6 • June 2004
Pages: 861 - 868
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Nov 27, 2001
Accepted: May 29, 2003
Published online: May 14, 2004
Published in print: Jun 2004
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