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Lateral load pattern in pushover analysis

Sun Jingjiang (孙景江)1, Tetsuro Ono 2, Zhao Yangang (赵衍刚) 2 and Wang Wei (王威)1

  1. Institute of Engineering Mechanics, China Seismological Bureau, Harbin 150080, China
  2. Department. of Architecture, Nagoya Institute of Technology, Nagoya 466-8555, Japan

Abstract: The seismic capacity curves of three types of buildings including frame, frame-shear wall and shear wall obtained by pushover analysis under different lateral load patterns are compared with those from nonlinear time history analysis. Based on the numerical results obtained a two-phase load pattern: an inverted triangle (first mode) load pattern until the base shear force reaches b times its maximum value, Vmax, followed by a (x/H)α form, here b and α being some coefficients depending on the type of the structures considered, is proposed in the paper, which can provide excellent approximation of the seismic capacity curve for low-to-mid-rise shear type buildings. Furthermore, it is shown both the two-phase load pattern proposed and the invariant uniform pattern can be used for low-to-mid-rise shear-bending type and low-rise bending type of buildings. No suitable load patterns have been found for high-rise buildings.

Keywords: pushover analysis; performance-based design; Lateral load pattern; nonlinear time history analysis

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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.