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Dynamic responses under the excitation of pulse sequences

Dai Junwu (戴君武)1, Mai Tong2, George C. Lee2, Qi Xiaozhai (齐霄斋)1 and Bai Wenting (白文婷)1

  1. Institute of Engineering Mechanics, China Earthquake Administration. Harbin 150080, China

  2. Multidisciplinary Center for Earthquake Engineering Research, University at Buffalo, Buffalo, NY, 14261, USA

Abstract: This paper studies the dynamic responses of SDOF system under pulse-dominant excitations. The purpose of the study is to prepare for scrutiny of some near-field pulse-dominant ground motions and their potential to cause structural damage. Extending the single pulse dynamics, we consider the effect of pulse sequences. This kind of excitation was particularly obvious in some of previous earthquakes such as Northridge (1994) and Chi-Chi (1995). Based on the duration, peak and rise and decay era of the main pulse as well as its relationship with the predecessor and successor pulses, we propose a classification for the pulse sequences. Consequent studies have been carried out for acceleration, velocity and displacement response spectra of the main pulse with either a predecessor or a successor pulse. The analysis also includes general response behaviors in different fundamental period segments and special aspects of response at certain points (e.g., the corresponding peak points).

Keywords: pulse sequences; near-field ground motions; triangle pulse representation; Chi-Chi earthquake; response spectra

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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.