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针对斜拉桥结构是索力敏感体系,但是索力随机对斜拉桥结构特性的影响一直缺乏定量分析的问题,结合蒙特卡罗方法、找形方法和调索方法,首次提出了一种考虑索力随机的斜拉桥结构分析方法,并针对某一辐射型疏索体系斜拉桥,分析了斜拉索索力随机对其结构静力性能的影响。计算结果表明:索力变异2%引起的主梁截面弯矩变异为30%~50%,引起的主梁截面应力变异在11.42%左右,引起的跨中挠度变异在440.25%左右;索力变异2%引起的挠度变化大于结构截面应力的变化;索力变异对结构的影响还表现在对于不同的索力样本,结构的最大或最小弯矩截面的位置在随机变化,交替出现在某些特定的截面上。
However, the influence of cable force on the structural characteristics of cable-stayed bridges has always been a lack of quantitative analysis. Combining the Monte Carlo method, the method of finding the shape and the method of reconstructing the cable, this paper presents for the first time a Cable force random cable-stayed bridge structural analysis methods, and for a cable-type cable-stayed cable-stayed bridge, analysis of the cable-stayed cable tension random effects on the static performance of the structure. The calculation results show that the bending moment variation of girder section caused by 2% of cable force variation is 30% ~ 50%, the stress variation of girder section induced is about 11.42%, and the variation of midspan deflection caused is about 440.25% 2% of the change caused by the deflection is greater than the structural cross-section stress changes; cable force variation on the structure is also reflected in the different cable samples, the structure of the maximum or minimum moment section in a random change in position, alternating in some specific On the cross section.