Use of Modal Flexibility for Damage Detection and Condition Assessment: Case Studies and Demonstrations on Large Structures
Publication: Journal of Structural Engineering
Volume 132, Issue 11
Abstract
Displacement coefficients and profiles are presented as promising kernel condition and damage indices along with real-life examples. It is shown that dynamic tests, which do not require stationary reference measurement locations, can also be used to generate data for the computation of modal flexibility. Modal flexibility can then be employed to obtain the displacement profiles. It is also shown that the modal flexibility can be obtained from the frequency response function measurements of the structures. Problems such as environmental effects on measured data and limitations such as incomplete dynamic measurements, spatial and temporal truncation effects are commonly faced in damage detection and condition assessment of real structures. Possible approaches to mitigate these obstacles are discussed. The level of variation and the uncertainty that may be expected when displacement coefficients are extracted from real civil infrastructure systems are also presented. The methods are demonstrated on two real-life bridges and the findings are validated by independent test results.
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Acknowledgments
The first test structure, Seymour Bridge, was made available by the Ohio Department of Transportation (ODOT) and the research was supported by ODOT Research and Development and the FHwA through the HPR Program. The interest of and encouragement by Dr. Steven Chase and Dr. Hamid Ghasemi of FHwA is deeply appreciated. The writers would like to thank Dr. Cantieni (EMPA, Switzerland), Dr. Farrar and Dr. Doebling (Los Alamos National Labs), Dr. Rubin and Dr. Duron (Aerospace Corporation), and Professor Ewins (Imperial College, U.K.) and Professor Yao (Texas A&M) who served as members of the peer review panel for this research. The contributions of former graduate students Drs. Levi and Turer, Messrs. Barrish and Grimmelsman, Ms. Griessman, and especially Dr. Lenett for field tests conducted on the bridge are to be acknowledged. For the Z-24 Bridge, the writers would like to thank Professor Guido De Roeck (Katholieke Universiteit Leuven) for providing data and figures of the bridge for this study. In addition, the writers appreciate Professor Robert Bolton (Texas A&M University) for coordinating a collaborative benchmark study on the Z-24 Bridge. They would also like to acknowledge all the researchers and students who conducted the Z-24 Bridge study in Switzerland and made their data available to others, including the writers.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 11 • November 2006
Pages: 1699 - 1712
Copyright
© 2006 ASCE.
History
Received: Nov 15, 2004
Accepted: Oct 25, 2005
Published online: Nov 1, 2006
Published in print: Nov 2006
Notes
Note. Associate Editor: Sashi K. Kunnath
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