Analyses Of Service Stage Performance And Cable-Pylon Anchorage Detailed Stress For Cable-Stayed Bridge With Unusual Shape Leaning Steel Tower

Firstly, the development of modern cable-stayed bridge is summarized, and the development of the domestic and foreign special-shaped cable-stayed bridge is emphatically introduced. The commonly used form of anchorage of cable-tower and the stability of steel-pylon of cable-stayed bridge is introduced in this thesis. Then, the preliminary design scheme of a special cable-stayed bridge with a span of (70+80+200+80+70) m continuous steel box girder is taken as the engineering background. The finite element software MIDAS/CIVIL is used to establish the full-bridge element model. The model is used to calculate the static behavior in the using stage of this bridge. The displacement and stress of the bridge under the action of dead load, live load, temperature load, wind load and their combination are obtained, and the force performance of the bridge is judged. Then, the finite element analysis, software ANSYS is used to analyze the stress of cable-tower anchorage for the cable-stayed bridge. In order to simulate the boundary conditions accurately, a full-bridge combined element model based on truss element, shell element and solid element is established. The stress of each plate in anchorage zone under dead load, dead load and unfavorable live load is calculated and analyzed in detail. Combined with the results of local calculation and analysis, two improved schemes are proposed and compared to make the stress of the whole bridge tower anchorage structure more reasonable. Finally, the stability analysis of the full-bridge stage is carried out, and the failure modes of the bridge are obtained. Based on the results of the full-bridge stability analysis, the local stability analysis of the plate-shell element model is carried out, and the layered beam element and layer by layer yield model is established, and the ultimate bearing capacity of the bridge is analyzed.