| 【文章摘要】 This paper presents the performance reliability and functional complexity of prestressed concrete girders strengthened -with an emerging rehabilitation method using post-tensioned near-surface-mounted (NSM) carbon fiber-reinforced polymer (CFRP) strips. The influence of corrosion damage on the flexural capacity of the girders is theoretically predicted based on a stochastic approach, including an emphasis on chloride diffusion and concentration. A total of 1,650,000 cases having various CFRP-post-tensioning levels from 0 to 60% of the strength of CFRP are simulated, and corresponding results are analyzed. Predictive results indicate that the effect of corrosion becomes distressful with a time gap of 13.7 years after the initiation of corrosion from a practical point of view. The efficacy of the post-tensioned NSM CFRP in terms of preserving flexural strength and reducing vulnerability to deterioration is more pronounced with an increase in service year, based on a robust stress redistribution mechanism. Functional complexity is also reduced after strengthening, which can better achieve the given functional requirements of constructed bridge girders. Performance-based design factors are proposed, depending on service categories that are a function of traffic volume. |