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Indexed by:期刊论文

Date of Publication:2017-05-01

Journal:JOURNAL OF VIBROENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:19

Issue:3

Page Number:1962-1979

ISSN No.:1392-8716

Key Words:near-fault ground motions; base-isolated structure; Hertz-damp model; numerical analysis; structural pounding

Abstract:Pounding phenomenon between base-isolated structures under near-fault earthquakes has been widely investigated with various impact models around the world. Firstly, the existing impact analysis models are summarized and discussed in this paper. For the Hertz-damp impact model, the damping constant does not coincide with its physical fact. Then, the damping constant in the Hertz-damp impact analysis model was modified based on the Hertz theory. Next, the approximate formula of the damping constant is theoretically derived, and the effectiveness is verified by a simulation analysis. The numerical results show that the pounding can significantly increase the floor acceleration, especially at the isolation layer. In addition, the impact stiffness has a significant effect on the acceleration response, and the inter-story drifts are also sensitive to the variety of impact stiffness. The simulation results indicate that excessive flexibility at the base-isolated system may lead to a susceptible pounding with a limited seismic gap.