Static Finite Element Analysis of Arch Bridge with V-shaped Rigid-frame

Structure of arch bridge with V-shaped rigid-frame is complicated.In order to know and master the mechanical property of this bridge,a 3D elastic finite element model of Xiaolan grand bridge was built,in which 8-node solid elements were adopted for discrete analysis of the main girder,the V-shaped rigid-frame and the arch,3D beam and truss elements for chord and web members,and 3D link elements for suspenders.The 3D elastic static calculation of the built bridge was performed based on the general finite element software ANSYS,and the possible wrecked conditions were also simulated.Based on these results,the deformations,stress distributions of the bridge and tension of the suspenders were analyzed and contrasted.The results indicate that(1) the V-shaped rigid-frame of the bridge bears the main loads while the arch play an reinforced role in load bearing;(2) prestress is very important to the security of the bridge;(3) the bridge has a good capability of stress-redistribution while some suspenders crack;(4)stress-distribution of the arch springing is complex,measures should be taken to avoid local failure.