【摘要】 基于时变可靠度理论,考虑桥梁结构的中介状态,结合现行规范给出了钢管混凝土拱桥三级工作模式的具体确定方法,建立了可靠度与三级工作模式的直接关系。引入状态变量,通过可变时间增量法推导了动态蒙特卡罗法失效概率与损伤概率的基本公式。算例以一座运营了10年,主跨83.6m的钢管混凝土拱桥为对象,根据实桥试验数据,用动态蒙特卡罗法评估了该结构的可靠度。算例桥在第10年时,损伤可靠度与失效可靠度均大于规范规定的目标可靠度,结构处于完好工作状态,这一结论与实际情况相符。更多还原

【Abstract】 In light of time-dependent reliability theory,on basis of intermediate working state and combining the current specifications and stress characteristics of in-service concrete-filled steel bubular(CFST) arch bridge,we offered a specific determination principle of three-staged working mode,set up a direct relation between reliability and three-staged working mode,and deduced a basic formula for the failure and damage probability through the introduction of both state variables and dynamic Monte Carlo method.In this paper we took a bridge which is a CFST arch construction and has been in service for 10 years as a sample to evaluate the reliability of such structures through the use of the experimental data and dynamic Monte Carlo method and found that both the indexes of failure and damage reliability of the bridge in the tenth year are above those of target reliability.The bridge is still in good working state,which is consistent with the truth.更多还原