Time-Dependent Reliability and Redundancy of Corroded Prestressed Concrete Bridges at Material, Component, and System Levels
Publication: Journal of Bridge Engineering
Volume 24, Issue 9
Abstract
Due to structural deterioration, the performance of concrete bridges degrades with time and may result in catastrophic failure events, especially for nonredundant structures. This paper develops a methodology for assessing time-variant reliability and redundancy of multigirder prestressed concrete bridges at material, component, and system levels. Nonlinear analysis was performed to obtain the constitutive relationship of reinforced sections and girder components in which the adverse effects of reinforcement corrosion on structural capacity and ductility are considered. Subsequently, the nonlinear finite-element analysis was conducted to capture the time-dependent probabilistic resistance of the bridge system, considering different failure criteria (e.g., serviceability and ultimate limit states). Given the component- and system-level performance indicator, structural capacity-, reliability- and risk-informed redundancy was assessed. The feasibility and capability of the proposed approach were illustrated using an existing prestressed concrete bridge. The results demonstrate that the integrated damage mechanism between different levels has a significant effect on the structural ultimate capacity, reliability, and redundancy of corroded structures.
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Acknowledgments
This study was supported by the Hong Kong Polytechnic University under Start-Up Fund number 1-ZE7Q, a grant from the National Natural Science Foundation of China (Grant 51808476), and the Project of CNERC (Grant 1-BBYU). 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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Journal of Bridge Engineering
Volume 24 • Issue 9 • September 2019
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© 2019 American Society of Civil Engineers.
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Received: Nov 20, 2018
Accepted: Mar 28, 2019
Published online: Jun 18, 2019
Published in print: Sep 1, 2019
Discussion open until: Nov 18, 2019
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