Large-Scale Shake Table Test Verification of Bridge Condition Assessment Methods
Publication: Journal of Structural Engineering
Volume 134, Issue 7
Abstract
Methods that identify structural component stiffness degradation by pre- and postevent low amplitude vibration measurements, based on a linear time-invariant (LTI) system model, are conceptually justified by examining the hysteresis loops the structural components experience in such vibrations. Two large-scale shake table experiments, one on a two-column reinforced concrete (RC) bridge bent specimen, and the other on a two-span three-bent RC bridge specimen were performed, in which specimens were subjected to earthquake ground motions with increasing amplitude and progressively damaged. In each of the damaged stages between two strong motions, low amplitude vibrations of the specimens were aroused, and the postevent component stiffness coefficients were identified by optimizing the parameters in a LTI model. The stiffness degradation identified is consistent with the experimental hysteresis, and could be quantitatively related to the capacity residual of the components.
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Acknowledgments
This study is sponsored by Caltrans under Contact No. UNSPECIFIED59A0311 managed by Mr. L.-H. Sheng. The shake table tests were conducted at University of Nevada, Reno by a research team at UNR. Deep appreciation is owed to Professor M. Saiidi, Professor D. Sendars, Dr. P. Laplace, and Mr. P. Lucas for their kind assistance during the experiments and for providing their design drawings, pushover analysis results, and some experimental data.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 7 • July 2008
Pages: 1235 - 1245
Copyright
© 2008 ASCE.
History
Received: Mar 30, 2006
Accepted: Oct 8, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
Notes
Note. Associate Editor: Ahmet Emin Aktan
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