Abstract
In predicting the response of track from a moving train only one track is generally considered. However, the effect of ground vibrations from one track and its effect on the nearby tracks has not been studied completely. Therefore, in the present paper, the effect of track irregularities and speed on the prediction of two-way tracks response is investigated. For this purpose, a three-dimensional dynamic finite element (FE) model capable of simulating interactions between the train and track by using a nonlinear hertz contact method was developed. The model uses tensionless stiffness between the wheel and rail to couple them. The model components including the sleeper, ballast, and soil domain are represented by solid brick elements. The rails are modeled as 3D Euler–Bernoulli beam elements. An iterative numerical algorithm was established for the integrations of the train and track interface. A comparative analysis was performed at various speeds and rail surface irregularity wavelengths. With the increase in speed, the results showed a significant increase in the adjacent tracks response and can induce much larger track vibrations at high frequency.
Highlights
Railways are a paramount and economical means for mass transportation and offer a suitable alternative to traffic congestion
Various train–track models have been proposed to study the generation of ground vibrations and their propagation due to moving loads
The track irregularities were calculated by using the power spectral density function (PSD) function which is considered as input for train pass-by simulations that are the source from the track
Summary
Railways are a paramount and economical means for mass transportation and offer a suitable alternative to traffic congestion. A half finite element domain with a single rail, half of the track and ground along the track was modeled to study the ground vibration due to moving load This assumption is not useful while considering track irregularities. The impact of train induced vibrations on adjacent structures and attenuation of ground vibration was studied by many researchers (e.g., [23,24,25,26,27,28]) In these studies, only one track or symmetry along the track (only one single rail) is considered to predict the track and ground vibrations due to moving loads. A model comprising three-dimensional soil domain and two-way track to investigate the effect of radiating waves from one track to the nearby track is developed This model considers the nonlinear train–track interaction and the rail–sleeper–ballast–soil interaction. The results of this numerical simulation and the effect of different classes of irregularities on tracks at different speeds are discussed
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