Static And Stability Analysis Of The Long-span COmposite Beam Cable-stayed Bridge

It is obtained the rapid development and had broad application prospects with its relatively many merits and strong competitiveness of combining girder cable-stayed bridge to other types of those in recent years. Therefore, to analysis and research static and stability of combining girder cable-stayed bridge have realistic meanings.This thesis's engineering background is JiangJin Guanyinyan YanChangJiang Bridge. Analysis static and overall stability of combining girder cable-stayed bridge and research girder local buckling stability under the multi-way stress state based on previous work of summarizing. The main contents and concluded conclusions are as follows:â‘ Using planar bar system structure of the finite element method, based on solving static with load combination, then it will have the maximum stress which is near the auxiliary pier of girder and near the bridge tower of bridge deck, also it will have the maximum stress in across. The results are satisfied the specification requirements and the girder structure has overall safety;â‘¡se the space structure finite element method and analysis the biggest stress of the girder near auxiliary pier and the bridge deck near bridge tower and to giver. It will have the maximum deflection of in across. And all so can satisfy the requirements specification; first-order integral instability modal of the whole bridge is instability of lengthways to in-plane of bridge, and the safe stable coefficient is 7.7, and it is proved that the mainly reason of the girder overall instability is pressure flexor instability. Computational results have overall safety and do not exist overall instability issues;â‘¢ccording to the larger features of steel plate girder webs and through space finite element analysis, and then it will have the different instability forms of combining beam section in different load combination effect. The result is that the beam section will appear girder tilt instability under the action of load combination of pressure and it will appear local buckling instability of girder web and stiffening rib under the action of load combination of bend; the elasticity stability coefficient of girder tilt is 10.3 under the design load combination action, and the local buckling elasticity stability coefficient is 8.6 of girder web and stiffening rib. By analyzing available, the local stationary property of the main stringer, girder and stiffening rib can meet the design requirements.Through the above analysis and research of static and stability, it is to re-evaluation and proved the structure design which is already built, the analysis results ensure the girder safety and rationality of JiangJin Guanyinyan Yangtze river Bridge, and the main calculation analysis methods and research results also provide the theory support and technical reference for future and construction of similar bridges.