Research Into Design Theory Of Beam Bridges With High-piers And Long-spans

With the rapid development of highways in our country, bridge construction has come in the upsurge period which is unknown before. In some special terrain, the high pier bridges become indispensable. Beam bridges with high-piers and long-spans are widely used for their advantages, and then have being developed rapidly.With the high and strong materials and the thin wall structure used widely, the stability problem of the beam bridges with high-piers and long-spans becomes more and more important. In order to adapt to the high development of the beam bridges with high-piers and long-spans, we should make deeper researches into the older theories. Owing to the extensive applications of the beam bridges with high-piers and long-spans in engineering, so it has the important and realistic significance to make the buckling analysis and present a design that is satisfying to the using function and dependable safety construction and at the same time convenient to construction of the beam bridges consulting to the following factors, such as the actual circumstance of the beam bridges and every kinds of problems met when the design is presented. It offers an experienced instruction to whom will encounter the same circumstance during the practical work in the future.In the first chapter, it expands the origin and significance of the research problem, reviews and pays more attendance to the high piers home and abroad, and expands the purpose and in the end presents the main work of the paper. In the second chapter, it elaborates the basic design principles of the beam bridges with high-piers and long-spans. In the third chapter, it discusses nonlinear analysis of the beam bridges with high-piers and introduces the principles of nonlinear analysis of the high-piers using the finite element method. In the forth chapter, which is the kernel of this paper and embodies innovation of the paper's work, it introduces the two kinds stability problems, discusses the first stability problem and the second stability problem, puts forward the solving method, andleads nonlinear influence into the stability problems. In the fifth chapter, according to the computing results, it gives an example of the engineering application-Danjiangkou Er Qiao and makes analysis of the design and stability problems of the bridge using the large bridge design analysis system BRDH. In the last chapter, several valuable conclusions are summarized; some shortage and the future research orientation are also put forward at the same time.