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Shock and Vibration
Volume 2014, Article ID 151237, 10 pages
Research Article

New Equivalent Linear Impact Model for Simulation of Seismic Isolated Structure Pounding against Moat Wall

1Department of Civil Engineering, Shanghai University, Shanghai 200072, China
2School of Mechanicals, Shanghai Dianji University, 1350 Ganlan Road, Shanghai, China

Received 4 July 2014; Accepted 18 September 2014; Published 24 November 2014

Academic Editor: Dumitru I. Caruntu

Copyright © 2014 Yang Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Base-isolated buildings subjected to extreme earthquakes or near-fault pulse-like earthquakes can exceed their design gap distance and impact against the surrounding moat wall. Based on equating energy dissipation and maximum collision compression deformation of isolated structure with the Hertz-damp model and Kevin-Voigt model in the process of collision, an equivalent linear impact model (ELIM) is proposed to better predict impact response of seismic isolated structure. The formula of the equivalent linear stiffness of ELIM is theoretically derived. The effectiveness of ELIM is verified by comparing the results of numerical analyses with the results of pounding experiments. Four near-fault earthquakes are selected to validate rationality and accuracy of the proposed model using numerical analysis. The results indicate that the proposed linear model can nearly capture impact behavior of isolated structure in simulating the pounding-involved structural response.