外倾式拱桥稳定性多参数优化研究

Multiple Parameters Ootimization for Stability of Extraversive Arch Bridge

以某外倾式拱桥为工程背景,建立全桥空间有限元计算模型,分4个工况计算了该桥的稳定安全系数,通过改变拱肋外倾角度、拱肋刚度、端横梁刚度以及吊杆布置形式,计算了不同设计参数下结构在"恒载"工况以及"恒载+活载"工况的失稳特征值。结果表明:拱肋的刚度对稳定性起着决定性作用;吊杆的布置形式只改变拱肋的面内刚度,对于面外刚度没有影响。

The full bridge space finite element calculating model is established in terms of a specific project of arch bridge. The stability coefficient for the bridge is calculated under four kinds of working condition. The destabilization characteristic value of structure designed with different parameters is calculated under the working conditions of dead load and the dead load and live load combination by changing the extraversive angle of arch rib, stiffness of arch rib. stiffness of end floor beam and the layout of steeve. The result shows that the stiffness of arch rib plays an decisive part in stability, and the layout of steeve only changes the in-plane stiffness of arch rib and keep the out-plane one unchanged.