Finite Element Analysis Of The Static And Dynamic Characteristics Of Cable-stayed Bridge

Recently, the structural simulation technique for bridge is used more and more,and it has been one notable symbol of the progress of technique of bridge engineering. The simulation of cable-stayed bridge is based on entire FEM model,which can completely and exactly reflects the actual state and behavior. This paper studies the structural characters and mechanic specialties of cable-stayed bridge,detailed discusses the total thought and work process, and takes one engineeringexample to analyse comparatively the safe stability of the two excavating scheme of the project. Firstly, the basic theory of geometric nonlinear analysis for long-span cable-stayed bridge is introduced in this paper. Then three principle factors that affect geometric nonlinearity of cable-stayed bridges are described, which are large displacement, cable sag effects and combined effects of bending moment and axial force; then the finite element methods are introduced separately. And based on these factors, carry on nonlinearity analysis to a long-span cable-stayed bridge which forced dead loads.This paper also discusses the problem about dynamic characteristics and seismic response analysis of the long-span cable-stayed bridge. And apply finite element program to investigate the dynamic characteristics of the long-span cable-stayed bridge, involving the natural frequency and the characteristics of natural model.Seismic characteristics of structure was studied by the response spectrum analysis in the thesis.According the analytic process, some useful conclusions are obtained to provide the reference for the design and study of suspension bridges in the future.At last, we choose a scheme to resolve the actual project problem.