Jinjiangjinshajiang Bridge Dynamic Characteristics Analysis Of Cable-Stayed Bridge

The appearance of cable-stayed bridge injected new vigour to the world bridges.Now, cable-stayed bridges are being designed to the direction of long span because of its cross ablity and self advantages. With the overgrowth of the span, many problems have appeared.Morever,the dynamic problems caused by wind, quake and moving load are severe in chief.Cable-stayed bridge has apparent differences from other form of bridges in structure system, material stress behavior and so on. In these thesis, on the basis of existing data collected of cable-stayed bridges and dynamics, simply marshal the analytical method and finite element numerical analysis method of cable-stayed bridges. Taking the example of Jinjiang-jinshajiang cable-stayed bridge, establish 3-D finite element model of it with software ANSYS, and analyze its inherent vibration. These thesis also introduced some kinds of simplified methods of 3-D space modal, and made comparison of the inherent vibration features between them. During the transient dynamic analysis of Jinjiang-jinshajiang cable-stayed bridge, the time history responses of the structure under uniform velocity moving load and impact load are analyzed, and the amplification coefficients of deflection and internal forces of the structure are intensively analyzed. The study of cable-stayed bridge dynamic feature provide base theory for the design of antikonck> anwind and analysis of vehicle vibration.Through the analysis of dynamic, it can reveal more truly the structure stresses and deflection under the effect of vehicles.Then it can figure the structure reponse of bridge span when earthquake and wind affected.