Retrofit Optimization for Resilience Enhancement of Bridges under Multihazard Scenario
Publication: Journal of Structural Engineering
Volume 142, Issue 8
Abstract
Bridge retrofitting is a common approach to enhance resilience of highway transportation systems. The study uses a multiobjective evolutionary algorithm to identify retrofit design configurations that are optimal with respect to resilience and retrofit cost. Application of this algorithm is demonstrated by retrofitting a bridge with column jackets and evaluating resilience of the retrofitted bridge under the multihazard effect of earthquake and flood-induced scour. Three different retrofit materials are used: steel, carbon fiber, and glass fiber composites. The inherent disparity in mechanical properties and associated costs of these different materials gives rise to a trade-off between cost and performance when it comes to retrofit operations. Results from the optimization, the Pareto near-optimal set, include solutions that are distinct from one another in terms of associated cost, contribution to resilience enhancement, and values of design parameters. This optimal set offers the best search results based on selected materials and design configurations for jackets.
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Acknowledgments
The authors are thankful to the Pennsylvania State University (PSU), University Park, Pennsylvania for providing facilities to conduct the research. This study was supported by the National Science Foundation through Grant No. CMMI-1131359 and the Mid-Atlantic Universities Transportation Center (MAUTC) of the University Transportation Centers Program through project PSU-2012-01. The authors thank QuakeWrap Inc. for providing product details for composite jackets. Comments and suggestions provided by Dr. Maria Lopez de Murphy at various stages of this study are gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 8 • August 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Nov 1, 2013
Accepted: Jul 9, 2015
Published online: Sep 9, 2015
Discussion open until: Feb 9, 2016
Published in print: Aug 1, 2016
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