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Design spectra including effect of rupture directivity in near-fault region

Xu Longjun (徐龙军)1,2, Adrian Rodriguez-Marek3 and Xie Lili (谢礼立)2

  1. College of Engineering, Ocean University of China, Qingdao 266100, China
  2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
  3. Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, USA

Abstract: In order to propose a seismic design spectrum that includes the effect of rupture directivity in the near-fault region, this study investigates the application of equivalent pulses to the parameter attenuation relationships developed for near-fault, forward-directivity motions. Near-fault ground motions are represented by equivalent pulses with different waveforms defined by a small number of parameters (peak acceleration, A, and velocity V; and pulse period, Tv). Dimensionless ratios between these parameters (e.g., ATv /V, VTv /D) and response spectral shapes and amplitudes are examined for different pulses to gain insight on their dependence on basic pulse waveforms. Ratios of ATv /V, VTv /D, and the ratio of pulse period to the period for peak spectral velocity (Tv-p) are utilized to quantify the difference between rock and soil sites for near-fault forward-directivity ground motions. The ATv /V ratio of recorded near-fault motions is substantially larger for rock sites than that for soil sites, while Tv-p /Tv ratios are smaller at rock sites than at soil sites. Furthermore, using simple pulses and available predictive relationships for the pulse parameters, a preliminary model for the design acceleration response spectra for the near-fault region that includes the dependence on magnitude, rupture distance, and local site conditions are developed.

Keywords: near-fault ground motion; pulse; attenuation relation; velocity pulse period; design spectrum

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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.