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首先阐述了箱形拱肋线性和非线性稳定性分析的计算理论,随后以圭塘河通道建设工程的一座跨度为84m的大跨提篮式组合拱桥箱形拱肋为研究对象,利用Ansys、Ansys workbench与Midas有限元软件分别进行线弹性屈曲分析和非线性仿真分析,计算结果表明,拱肋结构在持续横向荷载作用下第一条拱肋首先屈服,但由于横撑与拱肋结构的组合,使得第二条拱肋能够持续保证拱肋横向受力;拱肋结构的稳定性由横向稳定所决定,而结构在成桥阶段荷载作用下的稳定性,则由拱肋结构的竖向稳定所决定。
Firstly, the calculation theory of linear and non-linear stability analysis of box arch ribs is expounded. Then, a box arch rib of basket-span composite arch bridge with a span of 84 m in Guitang River channel construction project is taken as the research object. Ansys and Ansys The results of linear elastic buckling analysis and nonlinear simulation analysis of workbench and Midas finite element software show that the first rib of the arch rib structure first yields under the continuous lateral load. However, due to the combination of the cross brace and the arch rib structure, So that the second arch rib can continue to ensure the lateral force of the arch rib; the stability of the arch rib structure is determined by the lateral stability, and the stability of the structure under the load during the bridging phase is determined by the vertical stability of the arch rib structure Decided.