Optimal Design On The U-shape Structure Of The Frame Bridge

With the great development of economy and society in China, the original cross modal of the highways and the railways has greatly restricted the development of the transportation industry in our country, while breed security problems. Changing the cross modal from crossing to the overpass is imperative. In places where the underground water level is higher, the u-shaped slot structure can better solve the problem of waterproof. Therefore, this kind of structure gets more and more applications.The u-shaped slot structure is a relatively new structure form; it can be divided into two parts of the sidewall and the bottom plate, the combined action of it and the frame bridge, excludes the groundwater outside. It can ensure the stability of the underground water level and cutting drying, convenient for construction, and has a simple structure.Based on a project, for the purpose of economic and security, there are some summaries and analysis of the related content of the design on u-shaped slot structure of frame bridge, and introduces the design method of u-shaped slot structure of the frame bridge, and analysis them. Using ANSYS10.0to analyze, at the same time makes every effort to get the optimal solution of the design and provide a certain basis for the design of the peers.The main contents include:(1) Taking the design of a u-shape structure in Qiqihar as an example, calculate by hand, according to the optimization design method, to design the side wall and the base plate of the U-shape structure.(2)Using ANSYS10.0, respectively by the u-shaped slot structures which sidewall the height is9m or5m as the analysis object, definite the base plate in BEAM3and the side wall in BEAM189, set up the beam element model, respectively, analyses the stress and displacement of the side wall and the base plate of the U-shape structure, prove the correctness of the optimization design method, put forward rational Suggestions.The conclusion is as follows:(1) Using numerical simulation and calculation by hand, show that the cross section form, wall top width is0.3m, back slope ratio is1:0.1, the thickness of the base plate is0.8m, are reasonable.(2)Using Earth pressure at rest to calculation Earth pressure is reasonable. (3)The side wall according to flexural member and the base plate according to elastic foundation beam are reasonable.(4)Combined with the basic principle of u-shaped slot structure design and examples, demonstrates the correctness and rationality of the optimization design method, the optimization design method can greatly shorten the design cycle, improve the efficiency of design, provide some basis for the design of similar structures.