| Steel-concrete composite bridge connects the steel girder and concrete plate connected into a flexural structure to work together by shear connector. Under the load, concrete plate is in pressure but steel girder is in tension, it makes full use of material properties of steel concrete, reduces the weight of the structure, makes the bridge span become larger, and at the same time improves the anti-seismic and economic properties of building. It is the important direction of bridge engineering development.Steel-concrete composite structure is more and more applied widely in our country, the good mechanical propertied and economic index make it in a wider application prospect, with the continuous development of experimental research and practical application, predictably Steel-concrete composite structure will promote quickly and become the main structure after concrete structure and steel structure.In this thesis, a long-span high-speed railway T rigid frame bridge stiffened by steel truss was investigated. The behavior of this new steel-concrete composite structure under the dead load and train load was analyzed. Through the research, and calculate mechanical properties in various conditions, finally provide the basis for design of the bridge.The main research content and key problem need to solve are as followed:(1) Base on the analysis of the existing theory of steel-concrete composite structure, and make the sophisticated high-speed railway long-span stiffening steel truss and concrete structure analysis model.(2) By means of the finite element software-MIDAS, using the principle of mechanics, to make the structure finite element model. Calculate compare and analyze the optimal composite structure.(3) As an example of Datong to Xian high-speed railway Yellow River bridge, combined with specific construction condition, to design and research which composite structure can be more efficient, high quality and economic and meet the high-speed rail specification. |
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