Finite Element Analysis Of Cable-Stayed Bridge With Steel Box Girders

On the basic of the study on the Qingdao Bay Bridge Hongdao channel bridge, and combining China's construction experiences of long-span steel box girder cable-stayed bridge, the dissertation presented systematical study of local-overall interactive stability of such bridge through finite element analysis. Midas was used to establish space truss model for the overall stress analysis of cable-stayed bridge, and ANSYS was used for stability analysis. The main works involved in this research are as follows.The cable-pylon anchorage system of Hongdao channel bridge adopted steel anchor plate to anchor, which was a steel-concrete combined structure. ANSYS was used to establish finite element to model the pylon anchorage zone of the cable-stayed bridge, to analyze the force behavior under different load condition at the contact of the tower and pedestal and the cross section for the pedestal.The cable-girder anchorage was the key part of the cable-stayed bridge; the anchor box was used as the anchor structure through welding box structure on the lateral side of web. The cables were anchored on the bearing plate of anchor box, to distract the huge stress from the cables to the entire girder cross section. On the basic of overall analysis of cable-stayed bridge, ANSYS was used for local analysis the force behavior of the anchorage between cables and girders.The section model was established to study on the second and third system stress behavior of box girder under the least favorable load conditions. During the analysis, it came out the distribution of local stress and overall displacement, and the maximum local stress didn't exceed the yield strength.By the finite element analysis of the cable-stayed bridge with steel box girder, the suggestions for designing of cable-stayed bridge were presented in this dissertation. The steel anchor plate was adopted as the pylon anchorage system of Hongdao Channel Bridge, which was a novel structure form and was used first time in China. Through the finite element analysis of this article, understand mechanism of force and transmission channels of the pylon anchorage, to offer reference for the appliance and promotion of this structure of cable-stayed in bridge construction in China.