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针对拱桥吊装过程中的扣索安全状态评定问题,分析了拱桥施工期的扣索抗力概率模型和荷载概率模型。采用施工期斜拉扣索的强度失效模式,建立了斜拉扣索的可靠性功能函数。以磨刀溪特大桥拱桥吊装施工为工程背景,采用蒙特卡洛方法计算了5根扣索在施工期的时变可靠度指标。研究表明:该文提出可靠度分析方法具有一定的适用性。随着施工工况的持续累加,扣索可靠度指标逐步降低。当劲性骨架合龙后扣索的可靠度指标呈现急剧上升的趋势。须高度关注最大悬臂施工阶段扣索的安全状态。
Aiming at the problem of safety assessment of buckle cable during the process of hoisting, this paper analyzes the buckle resistance probability model and load probability model of arch bridge during construction. The strength failure mode of the cable stayed during construction is used to establish the reliability function of the cable stayed cable. Based on the engineering background of the hoisting construction of the Osamu Arch Bridge, the time-dependent reliability index of 5 buckles during the construction period was calculated by Monte Carlo method. The research shows that the method proposed in this paper has some applicability. With the continuous accumulation of construction conditions, buckle reliability index gradually reduced. When the stiffness of the closure after the closure of the chain skeleton reliability index showed a sharp upward trend. High attention shall be paid to the safety status of the buckle during the construction of the largest cantilever.