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针对大跨度拱桥施工过程中缆索安全状态评定,分析了施工期缆索抗力模型和荷载模型,采用缆索强度失效模式建立了各施工工况下缆索的可靠度功能函数,提出了缆索吊装施工过程中的可靠度分析方法;以磨刀溪特大桥缆索吊装施工为工程背景,采用蒙特卡洛抽样法计算了各吊装工况下缆索的可靠度指标,结果表明在吊装小箱梁时缆索的可靠度指标最低,吊装施工过程中缆索的可靠度指标值均高于目标可靠度值,满足施工要求。
According to the assessment of cable safety status during the construction process of long-span arch bridge, the cable resistance model and load model during construction period are analyzed. The reliability function of cable under each construction condition is established by using cable failure mode. Reliability analysis method; Taking the construction of cable hoisting construction of the Grand Bridge over the Grand Bridge as the engineering background, the Monte Carlo sampling method was used to calculate the reliability index of the cable under each hoisting condition. The results show that the reliability index The lowest, the hoisting construction process cable reliability index values are higher than the target reliability value, to meet the construction requirements.