既有钢筋混凝土桥梁正常使用极限状态可靠度分析

Methods of Reliability Analysis Based on Serviceability Limited State for Existing Reinforced Concrete Bridges

分析了既有钢筋混凝土桥梁正常使用极限状态可靠度分析的特点;研究和讨论了模糊失效界限和荷载等级提高对既有桥梁正常使用极限状态可靠度影响;以钢筋混凝土最大裂缝宽度作为构件正常使用状态的分析对象,建立了混凝土构件在正常使用状态下的极限状态方程,并根据一座实际桥梁的检测资料进行了可靠度计算,讨论了正常使用情况下各个因素对混凝土构件可靠指标的影响.

The reliability of ultimate limit state and serviceability limit state are both important for structure safety evaluation. Sometimes, the reliability of serviceability limit state is the critical target for existing structure in use. Therefore, the characteristics of the reliability analysis on serviceability limited state for existing reinforced concrete bridges were discussed. The effect of the improvement of live load and the difference of fuzzy failure bounds on reliability was studied. With crack width as the analysis parameter of normal limited state, the calculation of a reinforced concrete bridge was demonstrated on the basis of updated inspection information.