Journal
ENGINEERING STRUCTURES
Volume 117, Issue -, Pages 358-371Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2016.03.011
Keywords
Time-dependent reliability; Strengthened bridge; Prestressed concrete; Box girder; Finite element method
Categories
Funding
- Open Foundation of National Engineering Laboratory for High Speed Railway Construction [HSR2013029]
- Natural Science Foundation of Jiangsu [BK20130023]
- Fok Ying Tung Education Foundation [131074]
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Prestressed concrete (PSC) box-girder bridges are extensively used in highway and railway construction. Excessive long-term deflection and unexpected cracks however are often observed. To achieve deflection control and/or to restore the bearing capacity of bridges, structural strengthening measures are frequently adopted. This paper proposes an approach based on probabilistic finite element analyses to evaluate the time-dependent reliabilities of strengthened PSC box-girder bridges. The time-dependent behaviour of the girders is simulated considering concrete shrinkage, creep and cracking, corrosion and stress relaxation of steel, etc. In particular, phased analysis is adopted to account for the existing damage and stress conditions prior to strengthening, and the incremental static analysis method is used to calculate the structural reliabilities. Application is made to the time-dependent reliability assessment of a PSC box-girder bridge, and the effectiveness of three strengthening methods including externally bonded steel plates, fibre reinforced polymer (FRP) composites and external post-tensioning is compared. The presented study provides references to reliability-based design and optimization of strengthening strategies for PSC box-girder bridges. (C) 2016 Elsevier Ltd. All rights reserved.
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