Dynamic response variability of a small span bridge for high speed rail traffic

2011 ◽  
pp. 2974-2980
Author(s):  
J Rocha ◽  
A Henriques ◽  
R Calçada
Keyword(s):  
Dynamic Response ◽  
High Speed ◽  
Response Variability ◽  
High Speed Rail ◽  
Rail Traffic

scholarly journals Moving element analysis of high-speed rail system accounting for hanging sleepers

2018 ◽  
Vol 148 ◽  
pp. 05007 ◽  
Author(s):  
Jian Dai ◽  
Kok Keng Ang ◽  
Dongqi Jiang
Keyword(s):  
Dynamic Response ◽  
High Speed ◽  
High Speed Train ◽  
Train Track ◽  
Element Analysis ◽  
High Speed Rail ◽  
Factors Affecting ◽  
Rail System ◽  
Track System ◽  
Ballasted Track

It is very common in the ballasted track system that sleepers are not well supported by the ballast materials due to the uneven settlement of the ballast under repeated train passage. These unsupported track elements are often termed as hanging sleepers and they can lead to undesirable effects due to increased dynamic response of the train-track system, especially when the speed of the train is high. In this paper, we present a computation scheme in conjunction with the moving element method for the analysis of high-speed train-track dynamics accounting for hanging sleepers. The proposed computational scheme will be first verified by comparison with available analytical results. The dynamic response of a high-speed train traveling on a ballasted track considering unsupported sleepers is next investigated. Various factors affecting the response of the high-speed rail system including the speed of the train, the number of hanging sleepers and the pattern of the hanging sleepers will be examined and discussed.

Scheduling of high-speed rail traffic based on discrete-time movement model

2013 ◽  
Vol 22 (12) ◽  
pp. 120501 ◽  
Author(s):  
Ya-Hua Sun ◽  
Cheng-Xuan Cao ◽  
Yan Xu ◽  
Chao Wu
Keyword(s):  
Discrete Time ◽  
High Speed ◽  
Movement Model ◽  
High Speed Rail ◽  
Time Movement ◽  
Rail Traffic

Dynamic Response of High-Speed Train-Track System Due to Unsupported Sleepers

2018 ◽  
Vol 18 (10) ◽  
pp. 1850122 ◽  
Author(s):  
Jian Dai ◽  
Kok Keng Ang ◽  
Dongqi Jiang ◽  
Van Hai Luong ◽  
Minh Thi Tran
Keyword(s):  
Dynamic Response ◽  
High Speed ◽  
Numerical Study ◽  
Computational Scheme ◽  
The Finite Element Method ◽  
High Speed Rail ◽  
Factors Affecting ◽  
Track System ◽  
Three Phase ◽  
Element Method

This paper is concerned with a numerical study on the dynamic response of a high-speed rail (HSR) system subjected to unsupported sleepers using the moving element method (MEM). A three-phase computational scheme in conjunction with the MEM is proposed to account for the motion of the unsupported sleepers in relation to the truncated rail segment in the moving coordinate system. The accuracy of the proposed computational scheme is examined by comparison with available analytical results in the literature and against the finite element method using commercial software. A parametric study is conducted using a computational model consisting of a 10-degree of freedom train model and a three-layer ballasted track model to investigate the effect of unsupported sleepers on the dynamic response of the HSR system. Various factors affecting the response of the HSR system, including the speed of the train, the number of unsupported sleepers and the distance between the unsupported sleepers, are examined and discussed.

Vertical Dynamic Response of High-Speed Rails During Sudden Deceleration

2017 ◽  
Vol 14 (02) ◽  
pp. 1750014 ◽  
Author(s):  
Minh Thi Tran ◽  
Kok Keng Ang ◽  
Van Hai Luong
Keyword(s):  
Dynamic Response ◽  
High Speed ◽  
Computational Study ◽  
Railway Track ◽  
Contact Theory ◽  
High Speed Rail ◽  
Nonlinear Contact ◽  
Train Speed ◽  
Euler Bernoulli Beam ◽  
Two Parameter

In this paper, a computational study using the moving element method is carried out to investigate the dynamic response of a high-speed rail (HSR) experiencing sudden braking. The train is modeled as a 10-DOF system of interconnected spring-damping units. The Hertz contact theory is employed to account for the nonlinear contact force between the wheel and rail. The railway track is treated as an Euler–Bernoulli beam resting on a two-parameter elastic damped foundation. The effects of wheel sliding, initial train deceleration, initial train speed and the severity of railhead roughness on the dynamic response of the HSR are investigated.

Dynamic response of soft soils in high-speed rail foundation: in situ measurements and time domain finite element method model

2019 ◽  
Vol 56 (12) ◽  
pp. 1832-1848 ◽  
Author(s):  
Yiqun Tang ◽  
Qi Yang ◽  
Xingwei Ren ◽  
Siqi Xiao
Keyword(s):  
Dynamic Response ◽  
Time Domain ◽  
High Speed ◽  
In Situ Measurements ◽  
Vertical Acceleration ◽  
High Speed Rail ◽  
Foundation Soil ◽  
Train Speed ◽  
The Time Domain

The dynamic response of soil to vibrations induced by moving trains has been widely studied using in situ measurements. However, few in situ tests have been conducted to measure the resulting vibration of foundation soils, especially for the foundation of high-speed rail (HSR) in a soft area. In this study, a number of field experiments were conducted on Shanghai–Hangzhou HSR in a suburb of Shanghai, China. The testing instruments were installed in foundation soils just beneath the HSR track to measure the vibration induced by trains moving at different speeds. Test results show the frequencies of foundation soil vibration are characterized by the train speed and geometrical features of the trains and slab track. In the frequency domain, the dominant frequency bands for vertical acceleration, velocity, and displacement of foundation soil decrease successively. In the time domain, the magnitudes of vibration levels at different locations in a soil foundation decrease gradually with increasing distance from the track. Furthermore, higher train speed can result in higher vibration level. Based on the field conditions, a three-dimensional dynamic finite–infinite element model is developed in the time domain. It shows the model is capable of capturing the primary characteristics of train-induced vibration in the field.

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