论文部分内容阅读
综合考虑了大气环境下混凝土损伤和钢筋锈蚀等因素引起结构性能的退化,并结合服役梁桥时变可靠度分析的特点,建立了既有钢筋混凝土T梁桥的时变抗力计算模型,研究了其可靠度随时间的变化规律。结合一座在役T梁桥,基于Monte-Carlo模拟,计算得到了其可靠指标的时变曲线,结果与实际情况相符,验证了该模型的正确性与可靠性。最后,对影响结构性能的主要参数钢筋初锈时间、交通量与保护层厚度进行了敏感性分析,发现实桥超载是该桥维修加固的主要原因。
Considering the deterioration of the structural performance caused by concrete damage and steel corrosion in atmospheric environment, combined with the characteristics of time-varying reliability analysis of service girder bridges, the time-dependent resistance calculation model of existing T-girder bridges is established. The reliability of the law with time. Based on the Monte-Carlo simulation, a time-varying curve of its reliability index is calculated based on an existing T-girder bridge. The results are consistent with the actual situation. The correctness and reliability of the model are verified. Finally, the sensitivity analysis of the primary parameters of steel structure, such as initial rust time, traffic volume and thickness of protective layer, is carried out. It is found that overloading of the actual bridge is the main reason for the reinforcement of the bridge.