Studies On Interaction Vehicle-bridge Of Kilometer Cable-stayed Bridge

Cable-stayed bridge as one of the main bridge of a long-span bridge, at present, the biggest span has reached more than 1100 meters, with the increase of span and heavy traffic volume, vehicles and long-span Bridges between the coupling vibration problem is more and more prominent, so the study of the vehicle.the vibration problem is very necessary. Under the project the country’s largest cable-stayed bridge span Sutong Bridge background, this paper is through simulation and calculation software to analyze the dynamic response of the vehicle through the bridge and the Sutong Bridge when driving comfort issues.This paper builds the finite element model of the Sutong Bridge by ANSYS software. Then carry out the modal analysis and study the vibration of the bridge. Then it use four degrees of freedom biaxial flat cars to simulate the vehicle model and establish the vibration equation of the vehicle model under the assumption of certain assumption, then use the Newmark-β gradual integration of ideas, through MATLAB software programming to solve the vehicle vibration equation.This paper is based on the theory of finite element separation iteration, using ANSYS and MATLAB to solve the vehicle and bridge vibration equation when the vehicle passing through the bridge to. Through the effectively combining these two software to study vehicle- bridge coupled problem of Sutong Bridge. This paper mainly analyzes the different factors influence on bridge structure of different parts vibration response, through different parts of the bridge structure vibration response to discuss the dynamic magnification factor, and it indicates that the various parts of the dynamic magnification factor are more in line with the requireme nts.Finally, the paper introduces the Sperling index and ISO 2631 index for evaluating driving comfort degree. And choses the kind of evaluation on the more widely used internationally, ISO2631 to evaluate the long-span cable-stayed bridge of Sutong Yangtze River Bridge. It mainly analysis the dynamic response of the bridge and the vehicle under the influence of different speed and road surface roughness under the condition of the vehicle and the team, and draws the relevant conclusions. In order to provide some research basis for the relationship between the driving comfortableness of vehicles and the dynamic response of long-span cable-stayed bridges in future.