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Pushover analysis procedure for systems considering SSI effects based on capacity spectrum method

Wang Fengxia (王凤霞) 1, 2 and Ou Jinping (欧进萍) 1, 3

  1. School of Civil Engineering, Harbin Inst of Technology, Harbin, 150090, China
  2. Heilongjiang Science and Technology Institute, Harbin, 150090, China
  3. Dalian University of Technology, Dalian 116024, China

Abstract: This paper presents a new procedure to transform an SSI system into an equivalent SDOF system using twice equivalence. A pushover analysis procedure based on the capacity spectrum method for buildings with SSI effects (PASSI) is then established based on the equivalent SDOF system, and the modified response spectrum and equivalent capacity spectrum are obtained. Furthermore, the approximate formulas to obtain the dynamic stiffness of foundations are suggested. Three steel buildings with different story heights (3, 9 and 20) including SSI effects are analyzed under two far-field and two near-field historical records and an artificial seismic time history using the two PASSI procedures and the nonlinear response history analysis (NL-RHA) method. The results are compared and discussed. Finally, combined with seismic design response spectrum, the nonlinear seismic response of a 9-story building with SSI effects is analyzed using the PASSI procedures, and its seismic performance is evaluated according to the Chinese ‘Code for Seismic Design of Buildings.’ The feasibility of the proposed procedure is verified.

Keywords: pushover analysis procedure; soil-structural interaction (SSI); capacity spectrum method; equivalent SDOF system; nonlinear response 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.