Abstract
In this study, the dynamic responses of ballasted tracks subjected to heavy haul trains are investigated. The vehicle ballasted track interaction (VTI) model can be divided into three parts, which are vehicle model, ballasted track model and wheel/rail contact model. The vehicle is modelled as a multi-body system with 10 degrees of freedom. The ballasted track consisting of rail, sleeper, ballast, sub-ballast and sub-grade is modelled as four elastic components. The vehicle model and ballasted track model is linked by the wheel/rail contact model, which is determined by the nonlinear Hertzian theory. The VTI model is solved by an iterative procedure and validated with some field experiments. The dynamic responses of the vehicle/track system are compared with those from the moving load model. Moreover, the wheel/rail contact force, the force from rail to sleeper and the force from sub-ballast to subgrade are computed for different axle loads of 25t, 30t, 35t and 40t. It is deduced that maximum values of these forces increase in a linear form with the increasing of axle load.
Highlights
Railway has been playing a crucial role in the economic and social development during last decades[1]
The vehicle ballasted track interaction (VTI) model is developed, which consist of vehicle model, ballasted track model and wheel/rail contact model
It means that the wheel/rail contact force is a periodic force, which is dominated by the axle load and sleeper spacing
Summary
Railway has been playing a crucial role in the economic and social development during last decades[1]. Lei et al established a three layer beam model for ballasted track structures and studied the track vibration subjected to mixed passenger and freight cars by Fourier transform technique[3]. From the available technical literatures, it is indicated that the sub-ballast layer is not considered in the railway track model. For this reason, this paper is focused on this topic. A vertical vehicle ballasted track interaction (VTI) model is developed, where the vehicle model is built using multi-body dynamics and the ballasted track model is developed with finite element method. An iterative procedure is performed to compute the dynamic responses of the vehicle/track system, and the VTI model is validated by field experiments. The dynamic responses of ballasted track are computed through the numerical studies and some conclusions are drawn at the end
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