Experimental verification of using viscous damper for response mitigation of isolation systems subjected to nearfault earthquakes

Lyan-Ywan Lu, Ming Hsiang Shih, Shih Wei Yeh, Ging Long Lin, Shiu Wen Tzeng

Research output: Contribution to conferencePaper

Abstract

Recent studies have revealed that when a sliding isolation system is subjected to a nearfault earthquake that usually contains a pulse-like long-period velocity waveform, the system may suffer from a low-frequency resonance problem that can cause an excessive isolator displacement and degrades the isolation efficiency. In order to mitigate this problem, in this study, an isolation system with supplemental viscous damping is investigated experimentally. A hybrid isolation system that consists of a long-stroke fluid damper and a set of FPS (friction pendulum system) sliding bearings was tested in a shaking table test program. An element test performed on the fluid damper shows the hysteretic property of the damper can be well characterized by the Maxwell's viscous model. Acceleration records that contain long-period pulse-like waveform were used as the input ground motions in the shaking table test. The experimental result indicated that adding supplemental viscous damping in the sliding isolation system can effectively suppress the isolator displacement and mitigate the resonant effect due to a near-fault earthquake, without increasing the structural acceleration response.

Original languageEnglish
Publication statusPublished - 2008 Dec 1
Event11th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC-11 - Taipei, Taiwan
Duration: 2008 Nov 192008 Nov 21

Other

Other11th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC-11
CountryTaiwan
CityTaipei
Period08-11-1908-11-21

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction

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    Lu, L-Y., Shih, M. H., Yeh, S. W., Lin, G. L., & Tzeng, S. W. (2008). Experimental verification of using viscous damper for response mitigation of isolation systems subjected to nearfault earthquakes. Paper presented at 11th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC-11, Taipei, Taiwan.