Emulation And Examination Of Cable-stayed Bridge

Finite element method (FEM) occupies an important part in Computer Aided Engineering (CAE) methods. With the development of both hardware and software in the areas of Modern Mechanics, Calculating Mathematics and Computer Technology, FEM analysis sees a great progress obtained on FEM theories as well as its application so that the method has been widely applied in a variety of industrial fields like railway, bridge , petroleum industry, aviation, machinery manufacturing, transportation, architecture, shipbuilding, etc. Finite element method has become one of the most popular and efficient numerical analysis methods in engineering structure analysis. Finite element method has been introduced in the bridge structural intensity analysis since long time ago, and it has been widely used after the long-term accumulation.Static examination measures the internal force and distortion of a structure on static examinational load that is the most directly way to understand the mechanic and application characteristic of a structure. On the other way, cable-stayed bridge's dynamic characteristic is more important than any other style of bridges. Its even more be a crucial reason to a design of cable-stayed bridge. The bridge's capability of aseismic and anti-wind and vechicle-bridge coupling vibration are correlative with dynamic characteristic of the bridge. The dynamic examination on the bridge is one of the most reliable ways to evaluate the bridge's real dynamic characteristic.In this paper, a single-column pylon of single-cable-plane-cable-stayed bridge with asymmetry disposal be analyized. Based on the finite element method theory and accord with the real status of the bridge, a 3D structural model for entire bridge is built by finite element analysis software NASTRAN. The model not only can process static analysis and dynamic analysis, but also can deal with the problem of the buckling. It provides upstand diversity purpose. The dynamic characteristic of the cable-stayed bridge is calculated. The contrast between the data from computation and the data from experimentation shows that the 3D structural model is reasonable and exact.The dissertation includes the following chapters:Chapter 1 summarizes the developing reasons and the developing situation of compute theory of cable-stayed bridge. Chapter 2 discusses the structural specialtyand mechanic characteristic of cable-stayed bridge. Chapter 3 introduces the principle about how to compute cable-stayed bridge by finite element method. Chapter 4 introduces software MSC.Nastran's main trait and calculation function. Chapter 5 builds up the model of a cable-stayed bridge and computes it. Through examination validates that the result of emulation is reliability and practicability. Chapter 6 gives the conclusion.