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根据时变可靠性理论提出基于承载力可靠性的既有桥梁外贴碳纤维布加固后结构构件的剩余使用寿命预测方法,讨论了钢筋锈蚀、混凝土强度、纤维布加固耐久性以及荷载效应等因素变化对加固后既有桥梁结构构件承载力的影响.在国内外纤维片材加固混凝土结构的耐久性试验基础上,提出在加固后可以不考虑纤维布材料的老化及其纤维布材料与混凝土粘结界面的退化,使加固后钢筋混凝土构件承载力极限状态可靠度分析得到简化.结合一座实际桥梁工程进行了加固后可靠度计算,并对其剩余使用寿命进行预测.
According to the theory of time-varying reliability, the prediction method of the remaining service life of the structural members strengthened with carbon fiber cloth outside the existing bridges based on the reliability of bearing capacity is proposed. The factors such as reinforcement corrosion, concrete strength, durability of reinforcement and load effect are discussed Based on the durability test of reinforced concrete structures with fiber sheets at home and abroad, it is proposed that the aging of the fiber cloth materials and the bonding between the fiber cloth materials and the concrete can be avoided after the reinforcement The degradation of the interface makes the reliability analysis of the limit state of the reinforced concrete member simplified. The calculation of the reliability of the reinforced concrete bridge is carried out and the remaining service life is predicted.