Rocking bearings with variable frequency for near-fault seismic isolation

Lyan-Ywan Lu, Tzu Ying Lee, I. Ling Yeh, Hsun Chang

研究成果: Article同行評審

5 引文 斯高帕斯(Scopus)

摘要

A near-fault earthquake usually possesses a long-period pulse-like waveform that can result in an excessive isolator displacement in a conventional isolation system. To alleviate this problem, a rocking bearing with a variable frequency, called polynomial rocking bearing (PRB), is proposed in this study. Because the isolation stiffness of the PRB is a function of the isolator displacement, so the isolation frequency of a PRB isolator becomes variable. In addition, the isolation frequency is merely determined by the geometric parameters, and is independent of the isolated structural weight. When the rocking surface of the PRB is defined by a six-order polynomial function, the restoring force of a PRB bearing will have a softening behavior followed by a hardening behavior, which aims to suppress the maximum responses of the structural acceleration and isolator displacement. The result of numerical simulation has demonstrated that due to the property of variable frequency, the proposed bearing is able to effectively mitigate the resonance effect due to a low-frequency excitation. The result also shows that the PRB is particularly effective in suppressing the isolator displacement induced by a near-fault earthquake with a long-period pulse.

原文English
頁(從 - 到)283-298
頁數16
期刊Journal of the Chinese Institute of Civil and Hydraulic Engineering
22
發行號3
出版狀態Published - 2010 九月 1

All Science Journal Classification (ASJC) codes

  • 土木與結構工程

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