论文部分内容阅读
斜拉立体桁架是一种有发展前途的大跨度杂交结构体系。针对两塔三跨和一塔两跨两种结构形式,基于UL列式,采用混合有限元模型,对该结构体系进行了几何非线性屈曲分析以及几何、材料双重非线性屈曲分析,得出斜拉立体桁架的极限承载力。计算结果表明,只有同时考虑结构的几何和材料非线性的屈曲分析方法,才能准确地评估出结构的极限承载力。同时研究了不同塔高、桁架高度、索距以及跨度对结构极限承载力的影响,从中得出了一些结论可供设计人员参考。
Cable-stayed three-dimensional truss is a promising long-span hybrid structure. Aiming at the two structures of two towers with three spans and one tower with two spans, the nonlinear finite element analysis is carried out based on the UL formula and the nonlinear nonlinear buckling analysis of the structural system and the geometrical and material nonlinear buckling analysis. The ultimate bearing capacity of three-dimensional truss. The calculation results show that the ultimate bearing capacity of the structure can be accurately evaluated only by considering both the structure geometry and the material nonlinear buckling analysis method. At the same time, the influences of different tower heights, truss heights, cable distances and span on the ultimate bearing capacity of structures were studied, and some conclusions were drawn for designers' reference.