Field monitoring on vibration response of railway structure in the seasonally frozen region in summer

Effects of abrupt changes in track foundation stiffness on track vibration under moving loads;

Influences of the train on track vibration when passing through the railway with irregularities and rigidity abrupt change;

Research methods:By means of establishing the continuous elastic 3 layer beam model for track structure with random irregularity of track vertical profile,method of analyzing track vibration by Fourier transform technique is presented.

Specifications on railway track structure for speed-raising of the existing railway line;

The authors hope that this paper can provide a test support for future track structure design.

Research on design of reducing vibration and decreasing noise non-ballast railway track structure;

Secondly, in the case of periodic railway track structure, the general dynamical response in frequency domai.

Based on the analysis to the characteristic of urban mass transit and the ballast & non ballast railway track structure,this paper puts forward that the non ballast railway track structure should be adopted firstly in the urban mass transit,and the design & usage of reducing vibration & decreasing noise railway track structure are proposed and described in detail.

Starting from an analysis of the noise resource of urban rail transit and its mechanism, this paper introduces a block diagram of reducing noise and vibration, and holds that measures of reducing noise and vibration be presented in rail structure in the early stage.

After an analysis of the characteristics of urban mass transit based on Shanghai Pearl Line, the author argues that the selection of rail structure shall meet the fundamental requirements of the elevated urban mass transit, such as adopting 60 kg/m rail, Continuous Welded Rail, new - type WJ - 2 Rail Fastening as well as concrete support with concrete block structure, etc.