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Representation of near-fault pulse-type ground motions

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

  1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
  2. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
  3. Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, USA

Abstract: Near-fault ground motions with long-period pulses have been identified as critical in the design of structures. To aid in the representation of this special type of motion, eight simple pulses that characterize the effects of either the fling-step or forward-directivity are considered. Relationships between pulse amplitudes and velocity pulse period for different pulses are discussed. Representative ratios and peak acceleration amplification can exhibit distinctive features depending on variations in pulse duration, amplitude and the selected acceleration pulse shape. Additionally, response spectral characteristics for the equivalent pulses are identified and compared in terms of fixed PGA and PGV, respectively. Response spectra are strongly affected by the duration of pulses and the shape of the basic pulses. Finally, dynamic time history response features of a damped SDOF system subjected to pulse excitations are examined. These special aspects of pulse waveforms and their response spectra should be taken into account in the estimation of ground motions for a project site close to a fault.

Keywords: near-fault ground motion; pulse; velocity pulse period; response 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.