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An improved modal pushover analysis procedure
for estimating seismic demands of structures

Mao Jianmeng (毛建猛)1, Zhai Changhai (翟长海)2 and Xie Lili (谢礼立)1,2

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

Abstract: The pushover analysis (POA) procedure is difficult to apply to high-rise buildings, as it cannot account for the contributions of higher modes. To overcome this limitation, a modal pushover analysis (MPA) procedure was proposed by Chopra et al. (2001). However, invariable lateral force distributions are still adopted in the MPA. In this paper, an improved MPA procedure is presented to estimate the seismic demands of structures, considering the redistribution of inertia forces after the structure yields. This improved procedure is verified with numerical examples of 5-, 9- and 22-story buildings. It is concluded that the improved MPA procedure is more accurate than either the POA procedure or MPA procedure. In addition, the proposed procedure avoids a large computational effort by adopting a two-phase lateral force distribution.

Keywords: seismic demand estimation; pushover analysis; improved modal pushover analysis; two-phase lateral force distribution; capacity curve

 

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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.