Time-Variant Risk Assessment of Bridges with Partially and Fully Closed Lanes due to Traffic Loading and Scour
Publication: Journal of Bridge Engineering
Volume 21, Issue 6
Abstract
This article presents an approach for assessing time-variant risk associated with the closure of bridge lanes due to traffic loading and scour. Scenarios of lane closure are identified for both traffic loading and scour. The time-variant failure probabilities of girders under traffic loading are evaluated using a deterioration model that accounts for the decrease in resistance and a live-load model that considers the increase in maximum load effects. The annual failure probabilities of pier columns due to scour are estimated by comparing pier depth and scour depth caused by the annual peak flow. The probabilities of occurrence of the identified closure scenarios are computed on the basis of the relations between these scenarios and the failure events of girders and pier columns, and the correlations among failure modes are considered. The consequences caused by the lane-closure scenarios are evaluated by considering repair, running, and time-loss costs. Finally, the time-variant risks associated with the identified scenarios are assessed. The proposed approach is illustrated using a highway bridge as an example.
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Acknowledgments
The support from the U.S. Federal Highway Administration Cooperative Agreement “Advancing Steel and Concrete Bridge Technology to Improve Infrastructure Performance” Project Award DTFH61-11-H-00027 to Lehigh University is gratefully acknowledged. The opinions and conclusions presented in this article are those of the authors and do not necessarily reflect the views of the sponsoring organization.
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Published In
Journal of Bridge Engineering
Volume 21 • Issue 6 • June 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 11, 2014
Accepted: Jun 12, 2015
Published online: Feb 1, 2016
Published in print: Jun 1, 2016
Discussion open until: Jul 1, 2016
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