Study On The Design Of Jointless Bridge's Key Structure In Large Temperature Difference Area

Although the application of jointless bridge is more common, but the basic design is based on experience, having not set a uniform standard.the design of key structure is still in the exploration, especially in large temperature difference areas there is reference experience or less technical information in bridge design.This article discusses the classification and the mechanical characteristics of jointless bridge, introduced the basic theory of finite element and finite element software Midas/Civil numerical simulation of the advantages of using beam element to establish numerical models, and the bridge abutment and the main beam three connections to connect the border to simulate the elastic constraints, Main contents are the following:Relying on the xinguole jointless bridge in the cold Inner Mongolia region of large temperature difference, according to the force characteristics of jointless bridge, it establishes the finite element model of the method, focus on the joint to connect the abutment and main beam with the rigid, hinged and sliding mode three different connections,with large temperature difference temperature force participation in the key structural condition jointless bridge forms part of the force and force size, and their values were analyzed and compared, and found its moment distribution and the relationship between the law-beam connections; and according to rely on engineering geological conditions, the model only change the bridge abutment, the main beams and piles of three key structural jointless single-span bridge model, not change the external conditions. the changes were a single abutment stiffness, girder stiffness and bending rigidity of pile foundation, the key structural parts of internal forces obtained with the stiffness of the curve. Through the mathematical method and MATLAB software to solve jointless bridge abutment and the main beam and the pile stiffness coordinate distribution coefficient, and summarized for different bridge, different sections, various structures of different stiffness span coordination of distribution coefficient of thinking methods.In this paper with three ways to connect the abutment of the jointless bridge's key parts the similarities and differences of internal forces,the key structural stiffness change on the overall structure of the forces and the ways to find coordinate distribution of the stiffness coefficient in large temperature difference areas, to provide a jointless bridge design reference for the future.