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针对弦支筒壳结构中因拉索的锈蚀和松弛而引起的拉索预应力损失问题,基于可靠度理论,采用大型有限元分析软件ANSYS中的PDS模块对弦支筒壳结构进行了正常使用极限状态下拉索的可靠性分析.选取预应力损失对其影响较大的中部拉索进行锈蚀与松弛的模拟,通过使拉索横截面积和预应力呈百分比递减,分别模拟了单根和多根拉索的锈蚀与松弛.得到不同位置处拉索的可靠度指标根据输出的不同位置处的可靠度指标及其变化趋势,并据此得出拉索的锈蚀对结构可靠度的影响有一定的缓冲,松弛对结构可靠度的影响呈线性相关等结论.
Aiming at the problem of cable prestress loss due to the cable rust and relaxation in the case of chord support, based on the reliability theory, PDS module in the large finite element analysis software ANSYS was used to normalize the chord support structure The reliability analysis of the cable under the limit state is carried out.The simulation of the corrosion and relaxation of the middle cable which has a great influence on the prestress loss is carried out.When the cable cross section area and the prestress decrease proportionally, Root cable rust and relaxation.Get the reliability index of the cable at different locations According to the output reliability of the indicators at different locations and trends, and thus concluded that cable corrosion on the structural reliability of a certain Of the buffer, relaxation on the reliability of the structure was linearly related conclusions.