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Local measurement for structural health monitoring

G.Z. Qi (祁贵仲)1, Guo Xun (郭 迅)4, Qi Xiaozhai (齐霄斋)4, W. Dong (董伟民)3 and P. Chang2

  1. InfraTech, Inc. Silver Spring, Maryland, USA
  2. Department of Civil Engineering, University of Maryland/College Park, USA
  3. Risk Management Solution, San Francisco, California, USA
  4. Institute of Engineering Mechanics, CEA, Harbin, China

Abstract: Localized nature of damage in structures requires local measurements for structural health monitoring. The local measurement means to measure the local, usually higher modes of the vibration in a structure. Three fundamental issues about the local measurement for structural health monitoring including (1) the necessity of making local measurement, (2) the difficulty of making local measurement and (3) how to make local measurement are addressed in this paper. The results from both the analysis and the tests show that the local measurement can successfully monitor the structural health status as long as the local modes are excited. Unfortunately, the results also illustrate that it is difficult to excite local modes in a structure. Therefore, in order to carry structural health monitoring into effect, we must (1) ensure that the local modes are excited, and (2) deploy enough sensors in a structure so that the local modes can be monitored.

Keywords: structure health monitoring; local measurement; local modes; higher modes; local modes; excitation; sensors; structural vibration

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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.