大跨度钢拱桥的仿真与模态分析

Emulation and mode analysis of the long-span steel arch bridge

根据大跨度钢箱拱桥的特点,介绍了用大型有限元软件ANSYS进行大跨度桁架拱桥全桥运营状态及施工态模态分析的基本方法,分析了钢箱拱桥在预应力及重力作用下,大变形对结构模态的影响。同时,也对鱼骨式模型与实桥模型的模态进行了比较,所得结果可供大跨度钢拱桥的抗震抗风设计应用。

According to the traits of the long span steel arch bridge, the basic methods of analyzing the model of the long span steel arch bridge under the using state and the construction state are presented in this paper. The affects of the prestress and gravity on the arch bridge are analyzed. The modes of fishbone model and the true bridge model are compared. The results can be used to design the bridge under the earthquake or the wind loads.