Multi-scale Static Analysis Of Long-span Hybrid Girder Cable-stayed Bridge

With the continuous development and progress of the bridge project, the long-span of the hybrid girder cable-stayed bridge with reasonable mechanical properties and good economy has been more and more widely used. This thesis is based on the design of Jiujiang Yangtze River Bridge, Jiangxi.Firstly, the development profiles at home and abroad and its structure and the mechanical characteristics of the hybrid girder cable-stayed bridge are briefly introduced. Then, by using the large-scale finite element analysis software ANSYS, and the method of substructure, the multi-scale finite element model of the long-span of the hybrid girder cable-stayed bridge is established, the static analysis of the multi-scale finite element model is also analyzed.First part, based on the design of Jiujiang Yangtze River Bridge, the large-scale finite element model of the full-bridge is established. Then the force and deformation of the full-bridge under various conditions are calculated and analyzed, and provide the basis for later small-scale modeling analysis.Second part, based on the analysis results of the large-scale finite element model, the main beam across the middle and the steel-concrete composite segment are selected as key sections, then the small-scale finite element models of the key sections are established. By using the method of substructure, the large-scale model and the small-scale model are combined, and the stress and its distribution of the small-scale finite element models are analyzed under the most adverse conditions.The completion of this article can provide the reference for the design, construct-ion and scientific research of the long-span of the hybrid girder cable-stayed bridge.