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该文结合一座实桥,运用JC法分别计算了承载能力极限状态下,CFRP加固前后锈蚀(坑蚀)RC桥梁的时变可靠度指标。考虑钢筋均匀锈蚀和坑蚀的情况下,对CFRP加固RC桥梁后承载能力极限状态的时变可靠性进行了分析。结果表明:CFRP加固能够明显地提高锈蚀RC梁的可靠性能,可靠度指标能提高1左右。坑蚀情况下可靠度指标比均匀锈蚀的可靠度指标低,并且随时间的增加可靠度指标退化更显著,因此用均匀锈蚀模型会过高地预测加固后桥梁继续服役的耐久性,坑蚀模型更加符合加固后桥梁结构性能评估的需要。
Based on a real bridge, JC method was used to calculate the time-dependent reliability index of the RC bridge before and after the CFRP reinforcement (pitting corrosion) under the ultimate capacity. Taking into account the uniform corrosion and pitting corrosion of steel bars, the time-dependent reliability of the ultimate capacity of CFRP strengthened RC bridges is analyzed. The results show that the CFRP reinforcement can obviously improve the reliability of the RC beams, and the reliability index can be increased by about 1. In the case of pitting corrosion, the reliability index is lower than that of uniform corrosion, and the degradation of reliability index is more significant with the increase of time. Therefore, the uniform corrosion model will overestimate the durability of the bridge after service, and the pitting corrosion model is more Meet the needs of strengthening the bridge structure performance evaluation.