Structural performance assessment of concrete bridges in life-cycle
TIAN Hao1,2, CHEN Ai-rong1, CHEN Liang2
1.Department of Bridge Engineering, Tongji University, Shanghai 200092, China;
2. Zhejiang Scientific Research Institute of Communication, Hangzhou 310006, China
Some mechanics problems in the degradation process, such as deterioration of materials properties, reduction of section areas, and the variation of overall structural performance were solved in order to evaluate the lifetime performance of concrete bridges. A finite element-based analysis method related to the lifetime performance of concrete bridges was proposed and the corresponding program was written in Fortran 95. The variation of structural performance of a 3 m×25 m prestressed concrete continuous girder bridge exposed to chloride penetration environment was analyzed. Results show that the differences with respect to various structural responses with and without environmental effect are gradually significant after the reduction of concrete section. Concrete normal stress cannot meet the standard requirement after 60 years of structure completion. In the case of prestressed concrete bridges, the essential ingredient related to the variation of structural performance is the reduction of concrete section when the prestressing steel doesn’t corrode. The deficiency of durability is more likely to appear for the serviceability limit state with respect to prestressed concrete bridges．
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