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讨论了目前有限元软件对索单元模拟计算的考虑垂度的Ernst公式刚度折减和考虑初应力效应的几何刚度方法,并给出了精确描述索单元力学行为的解析方法。根据目前桥梁工程中主缆和斜拉索常用的力学和尺寸参数进行计算,分析两种模拟计算方法与解析解之间的误差,最后总结了悬索桥和斜拉桥计算时对主缆和斜拉索应采用的合理的模拟计算方法。
In the present paper, the stiffness reduction of Ernst equation considering the sag and the geometrical stiffness considering the initial stress effect are discussed with finite element software, and the analytical method for accurately describing the mechanical behavior of cable elements is given. According to the common mechanical and dimensional parameters of the main cable and the stay cable in the current bridge engineering, the errors between the two simulation methods and the analytical solution are analyzed. Finally, the calculation of the main cable and the cable-stayed bridge Cable should be used in a reasonable simulation method.