Probability-Based Bridge Network Performance Evaluation
Publication: Journal of Bridge Engineering
Volume 11, Issue 5
Abstract
This paper presents a comprehensive mathematical model for evaluating the overall performance of a bridge network based on probability analyses of network connectivity, user satisfaction, and structural reliability of the critical bridges in the network. A bridge network consists of all nodes of interest in a geographical region. These nodes of interest are connected to each other through multiple paths. The network performance evaluation in terms of connectivity is formulated by using an event tree technique. The network performance measure of user satisfaction deals with traffic demand and capacity of each link in the network. Moreover, the shortest paths in terms of total traffic costs are identified by network optimization algorithms for each pair of the origin and destination nodes of interest under the specified traffic demands. Using this information, the minimum-weight spanning tree (MST) that consists of the identified shortest paths is constructed. The bridges associated with MST are defined as the critical bridges in the network. The network performance in terms of structural reliability of the critical bridges can be computed from system reliabilities of the critical bridges by using a series-parallel system model. Finally, by combining the above three criteria, a single numerical measure is proposed to evaluate the overall performance of the bridge network. This novel approach is illustrated on a group of fourteen existing bridges with different reliability profiles located in Colorado. This study provides the basis of a network-level bridge management system where lifetime reliability and life-cycle costs are the key considerations for optimal bridge maintenance strategies.
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Acknowledgments
The partial financial support of the U.S. National Science Foundation through grants CMS-9912525, CMS-0217290, and CMS-0527871 is gratefully acknowledged. The support provided by the Colorado Dept. of Transportation is also greatly appreciated. A fruitful discussion about the event tree technique with Dr. Min Liu, former Research Associate, Dept. of Civil, Environmental, and Architectural Engineering, University of Colorado at Boulder, is highly appreciated. The opinions and conclusions presented in this paper are those of the writers and do not necessarily reflect the views of the sponsoring organizations.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 11 • Issue 5 • September 2006
Pages: 633 - 641
Copyright
© 2006 ASCE.
History
Received: Feb 9, 2005
Accepted: Sep 28, 2005
Published online: Sep 1, 2006
Published in print: Sep 2006
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