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Influence of earthquake ground motion incoherency on multi-support structures

Yang Qingshan (杨庆山)1 , M. Saiid Saiidi 2, Wang Hang (  )3 and Ahmad Itani4

  1. School of Civil Engineering and Architecture, Northern Jiaotong University, Beijing, 100044, China,
  2. Department of Civil Engineering, University of Nevada, Reno, NV, 89557,USA
  3. Beijing General Municipal Engineering Design and Research Institute, China
  4. Department of Civil Engineering, University of Nevada, Reno, NV, 89557, USA

Abstract: A linear response history analysis method is used to determine the influence of three factors: geometric incoherency, wave-passage, and local site characteristics on the response of multi-support structures subjected to differential ground motions. A one-span frame and a reduced model of a 24-span bridge, located in Las Vegas, Nevada are studied, in which the influence of each of the three factors and their combinations are analyzed. It is revealed that the incoherency of earthquake ground motion can have a dramatic influence on structural response by modifying the dynamics response to uniform excitation and inducing pseudo-static response, which does not exist in structures subjected to uniform excitation. The total response when all three sources of ground motion incoherency are included is generally larger than that of uniform excitation.

Keywords: earthquake; bridges; ground motion; incoherency; wave passage; local site characteristics; multi-support structures

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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.