Probabilistic Approach to Assessing Scoured Bridge Performance and Associated Uncertainties Based on Vibration Measurements
Publication: Journal of Bridge Engineering
Volume 20, Issue 6
Abstract
Whereas application of sensors that directly detect bridge scour at the foundation may be hindered because of their installation difficulty and vulnerability to floods, the identified scour rarely has been used to assess the bridge performance. This paper presents a new probabilistic approach to assessing the structural integrity of scoured bridges through Bayesian inference based on vibration measurements. The contributions of this paper include (1) introducing a novel application of Bayesian inference for assessing the structural integrity of scoured bridges; (2) parameterizing bridge scour, environmental variation impacts, and their associated uncertainties; (3) integrating the bridge model with the effective sampling algorithm to derive probability distributions of uncertain scour damage and other system properties; and (4) unifying uncertainties of identified scour and the probability of failure of scoured bridges. The proposed approach is illustrated and examined through a numerical study, and its potential for identifying bridge scour and assessing the scoured bridge’s performance reliability is demonstrated based on vibration measurements with environmental variations. The limitation of the presented study and future research directions are also discussed.
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Acknowledgments
The authors gratefully acknowledge partial support from the Mississippi DOT through the State Study 229 and from the National Science Foundation under Award No. NSF/DUE-0837395. The authors thank Prof. Jianye Ching from the National Taiwan University for providing the original MATLAB codes of the TMCMC simulation algorithm. Any opinions or conclusions expressed in this paper do not necessarily reflect the views of these funding agencies.
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Published In
Journal of Bridge Engineering
Volume 20 • Issue 6 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 22, 2013
Accepted: Jul 25, 2014
Published online: Aug 21, 2014
Published in print: Jun 1, 2015
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