The Research On Urban Viaduct Of The Ballasted Track Of The Anti-vibration Measure

As the development of social and economic and the improvement of science and technology, types of rail transportation on viaduct are developing rapidly, but the environmental pollution problem caused by vibration also have drawn people' s attention. Aiming at ballast track on viaduct, the analysis of paper focus on the vibration situation of viaduct and the transfer characteristics of the vibration while the train passing as well as incentive the system with the different frequency, and then in order to reduce the vibration on the impact of conducting the systematic analysis research by changing the parameter of the structure. It can provide a theoretical reference not only for the feasible research and the estimation of environmental influence, but also a theoretical basis for the selection of types of track for urban rail transit and the maintenance of track work.By establishing ballast tract-viaduct, floating slab tract-viaduct 2D modals, carrying on harmonic analysis by changing tie plate and ballast mat stiffness we can obtain the transfer characteristics of the vibration on ballast viaduct. making harmonic analysis may compare the transfer characteristics of the two different type of track system.Do some analysis on the dynamics' characteristics and the spread law of vibration under the loads of the train moving of the track structure which locate on the bridge. Simulate the dynamical response of the whole system when the moving load pass by the different velocity and modify the elastic modulus of the pad of sleeper and the pad of the ballast in the same velocity, and educe the spread characteristics of vibration of the ballast track located on the trestle. Then we can supply the gist in theory for the estimate of the environmental oscillation and the maintaining of the track traffic on the bridge in the future.Establishing the limited elementary model of the ballast track's transition section, doing some dynamical analysis through changing the length of the transitional area and the elastic modulus, we can educe the length in reason of the transition section and the law of the elastic modulus' change and supply the gist in theory for the construction and maintenance of the transitional area between the bridge and the roadbed.