Journal
ENGINEERING STRUCTURES
Volume 153, Issue -, Pages 1-16Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2017.09.060
Keywords
Widened concrete bridge; Live-load distribution factor; Shrinkage and creep; Corrosion; System reliability
Categories
Funding
- National Natural Science Foundation of China [51278182]
- China Scholarship Council [201606130095]
- Engineering Research Center for Advanced Technology for Large Structural Systems (ATLSS Center), Lehigh University, PA, USA
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Nowadays, bridge widening has become an economic option to tackle the increasing demand of the traffic volume and to enhance the capacity of existing highway bridges. Thus, relevant studies on the performance assessment of widened bridges are needed. This paper presents a computational probabilistic framework for time-variant reliability analysis of widened concrete highway bridges in a systematic manner considering the effects of live-load redistribution, structural deterioration, and concrete shrinkage and creep. Specifically, differences and inconsistences between the new and existing structures regarding live-load distribution, reinforcement corrosion, and concrete shrinkage and creep are considered. A finite element grillage model is constructed to investigate live-load distribution factors and internal axial forces caused by concrete shrinkage and creep. The uncertainties associated with shrinkage and creep effects are accounted for within the probabilistic framework. The flexural moment resistance of the bridge girder is computed considering the combined effects of the shrinkage-and-creep-induced axial force and structural deterioration. Ultimately, the system reliability of the widened bridge is calculated. The proposed probabilistic framework is applied to a widened prestressed concrete T-girder bridge. (C) 2017 Elsevier Ltd. All rights reserved.
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