Pre-Earthquake Multi-Objective Probabilistic Retrofit Optimization of Bridge Networks Based on Sustainability
Publication: Journal of Bridge Engineering
Volume 19, Issue 6
Abstract
Planning retrofit actions on bridge networks under tight budget constraints is a challenging process. Because of the uncertainties associated with this process, a probabilistic approach is necessary. In this paper, a probabilistic methodology to establish optimum pre-earthquake retrofit plans for bridge networks based on sustainability is developed. A multicriteria optimization problem is formulated to find the optimum timing of retrofit actions for bridges within a network. The sustainability of a bridge network and the total cost of retrofit actions are considered as conflicting criteria. The sustainability is quantified in terms of the expected economic losses. The uncertainties associated with seismic hazard and structural vulnerability are considered. The methodology is illustrated on an existing bridge network. Genetic algorithms are used to solve the multicriteria optimization problem. The effects of deterioration on bridge seismic performance are considered. The effects of the time horizon on the Pareto optimal solutions are also investigated.
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Acknowledgments
Support from the National Science Foundation through Grant No. CMS-0639428; the Commonwealth of Pennsylvania, Department of Community and Economic Development, through the Pennsylvania Infrastructure Technology Alliance (PITA); and the U.S. Federal Highway Administration (Cooperative Agreement Award DTFH61-07-H-00040) is gratefully acknowledged. The opinions and conclusions presented in this paper are those of the authors and do not necessarily reflect the views of the sponsoring organizations.
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Published In
Journal of Bridge Engineering
Volume 19 • Issue 6 • June 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 24, 2013
Accepted: Nov 21, 2013
Published online: Jan 22, 2014
Published in print: Jun 1, 2014
Discussion open until: Jun 22, 2014
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