Multiple Parameters Ootimization for Stability of Extraversive Arch Bridge

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.