Dynamic Interaction Analysis for Elastic Supported Bridge under Moving Loads
|關鍵字:||彈性支承橋樑;車橋動態互制;移動載重;振態函數;elastic supported bridge;vehicle-bridge dynamic interaction;moving load;mode shape|
The paper is aimed at the investigation of the dynamic interaction effects for elastic supported bridge under moving loads of high-speed trains. For precisely simulating the vehicle-bridge interaction, we model moving vehicle loads, bridge surface and bridge support in moving one-axle system and moving two-axle system, the visco-elastic layer composed of spring and viscous damping of wheel and ballast track system, as well as elastic support subjected to vertical translation. First, vehicle-bridge interaction motion equation and mode shape of bridge were formulated in process of analysis. Second, we used the skill of dimensionless parameters and finite Fourier transformation to get dimensionless form of a set of ordinary differential equations. After combining with dimensionless form of initial conditions, we can obtain the numerical solution for every function of vehicle-bridge by Runge-Kutta method. At last, we'll use several examples to analyze the vehicle-bridge dynamic interaction, in order to investigate time history response in two vehicle passing each other, different bridge span and velocity parameter, the position of maximum response, as well as the relation between maximum response, stiffness of bridge support, dimensionless parameters, track system, and simplified model, etc.
|Appears in Collections:||Thesis|