Static Analysis of Double X-shaped Arch Bridge in Construction Stage

The Zhanhe Bridge on Chengdonghe Road in Pingdingshan city is a double X-shaped arch bridge,which is the research object in this paper.Above all,the spatial finite element calculation model of it was established by using the spatial finite element method.Then both the internal force and displacement in arch rib of the bridge during the concrete pouring stage and the arch shelf discharging stage and the suspender tension sequence were calculated in detail.As a result the change law of the bridge component's stress and displacement,the change law of the cable force in suspender in different construction stages all can be deduced and summarized by the following points: The compression force is the main force than flexural torque in the arch rib.The tie beam is supported compression in the whole span because of the prestress force.The cable forces are uniform in all of the suspenders,so they play a remarkable role to the bridge's line shape control.Most of the concrete members of the bridge are in compressive state.The maximal compressive stress is less than the material allowable stress in bridge design.So the bridge has a higher safety factor,the bridge deformation is in the permissible range and the bridge construction is safe and reliable.The calculated results of the bridge provide references for the bridge construction monitoring and control.