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Study on inelastic displacement ratio spectra for near-fault pulse-type ground motions

Zhai Changhai (翟长海)1, Li Shuang (李爽)1‡, Xie Lili (谢礼立)1,2, and Sun Yamin (孙亚民)1

  1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
  2. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

Abstract: In displacement-based seismic design, inelastic displacement ratio spectra (IDRS) are particularly useful for estimating the maximum lateral inelastic displacement demand of a nonlinear SDOF system from the maximum elastic displacement demand of its counterpart linear elastic SDOF system. In this study, the characteristics of IDRS for near-fault pulse-type ground motions are investigated based on a great number of earthquake ground motions. The influence of site conditions, ratio of peak ground velocity (PGV) to peak ground acceleration (PGA), the PGV, and the maximum incremental velocity (MIV) on IDRS are also evaluated. The results indicate that the effect of near-fault ground motions on IDRS are significant only at periods between 0.2 s - 1.5 s, where the amplification can approach 20%. The PGV/PGA ratio has the most significant influence on IDRS among the parameters considered. It is also found that site conditions only slightly affect the IDRS.

Keywords: near-fault pulse-type ground motion; inelastic displacement ratio spectrum; ground motion parameter; PGV/PGA; site condition

 

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Copyright© 2009 IEM. Journal of Earthquake Engineering and Engineering Vibration. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as described below, without written permission from the Publisher. Copying of articles is not permitted except for personal and internal use, to the extent permitted by national copyright law, or under the terms of a license issued by the National Reproduction Rights Organization of China.