Time-Dependent Reliability of PSC Box-Girder Bridge Considering Creep, Shrinkage, and Corrosion
Publication: Journal of Bridge Engineering
Volume 16, Issue 1
Abstract
Bridge performance undergoes time-varying changes when exposed to aggressive environments. While much work has been done on bridge reliability under corrosion, little is known about the effects of creep and shrinkage on the reliability of concrete bridges. In this paper, the CEB-FIP model for creep and shrinkage is applied by using finite-element (FE) analysis in conjunction with probabilistic considerations. Verification is made by comparing the analytical findings with existing test data. More specifically, a time-dependent reliability assessment is made for a composite prestressed concrete (PSC) box-girder bridge exposed to a chloride environment. This realized via an advanced probabilistic FE method. The postcracking behavior of the thin-walled box girder is described using composite degenerated shell elements, and importance sampling is used to improve the efficiency of the reliability analyses. It is shown that concrete creep and shrinkage dominate during the early stages of bridge structure deterioration. This is accompanied by a decrease in reliability owing to the combined action of creep, shrinkage, and corrosion. The reliability indexes for the serviceability and the tendon yielding limit state fall below the target levels prior to the expected service life. Therefore, early maintenance and/or repair measures are required.
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Acknowledgments
The writers would like to express appreciation of the support from the National Natural Science Foundation of China under Grant Nos. NNSFC50725828 and NNSFC50608017 and 863 Program (Grant No. UNSPECIFIED2006AA04Z416).
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 16 • Issue 1 • January 2011
Pages: 29 - 43
Copyright
© 2011 ASCE.
History
Received: Oct 11, 2009
Accepted: May 10, 2010
Published online: May 14, 2010
Published in print: Jan 2011
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