Study on the Dynamic Response of Track Structure under Moving Loads with Variable Speeds

被引:0
作者
Li, Kefei [1 ,2 ]
Liu, Weining [1 ]
Markine, Valeri [2 ]
机构
[1] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China
[2] Delft Univ Technol, Fac Civil Engn & Geosci, Railway Engn Grp, NL-2600 AA Delft, Netherlands
来源
PROCEEDINGS OF THE 8TH INTERNATIONAL CONFERENCE ON STRUCTURAL DYNAMICS, EURODYN 2011 | 2011年
关键词
Analytical solution; dynamic response; track structure; moving loads; variable speeds; GROUND VIBRATION; RAILWAY TRACK; MODEL;
D O I
暂无
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
A periodic form solution of the track structure under moving train loads with variable speeds is introduced. The track is simplified as Timoshenko beam periodically supported with spring-damper elements. Firstly, the general dynamical response induced by moving loads on an elastic semi-infinite space is obtained on the basis of Duhamel Integral and Dynamic Reciprocity Theorem. Secondly, in the case of periodic track structure, the general dynamical response equation in the frequency domain is simplified in a form of summation within the track sleeper period instead of integral, which is obtained by transferring the moving loads on the rail to the moving of vibration pick-up point backward within periodic sleeper distance. In this way, the track response induced by the moving loads can be obtained by the calculation program. The train load is respectively modeled as constant moving force, single degree of freedom moving mass and two degree of freedom moving mass system. The calculation results indicate that: with the same passing speed of the loads, the induced vibration under the accelerated load is bigger than that under the constant-speed load; The frequency characteristic of the induced vibration is closely related to the time of the loads passing the sleeper spacing with the pick-up point and reflecting the self-frequency of the moving mass system; The interactive force between the moving mass and the track is much bigger than the gravity of the mass, and it is inaccurate to model the vehicle to be constant moving force.
引用
收藏
页码:846 / 851
页数:6
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