Determination of Upper Limit of Rail Pad Stiffness for Ballasted and Concrete Track of High-Speed Railway Considering Running Safety

Deformations of high-speed railways accumulate over time and affect the geometry of the track, thus affecting the running safety of trains. This article proposes a new method to map the relationship between dynamic responses of high-speed trains and additional bridge deformations. A train–track–bridge coupled model is established to determine relationship between the dynamic responses (e.g. accelerations and wheel–rail forces) of the high-speed trains and the track deformations caused by bridge pier settlement, girder end rotation, and girder camber. The dynamic responses are correlated with the track deformation. The mapping relationship between bridge deformations and running safety of trains is determined. To satisfy the requirements of safety and riding comfort, the suggested upper thresholds of pier settlement, girder end rotation, and girder camber are 22.6 mm, 0.92‰ rad, and 17.2 mm, respectively. This study provides a method that is convenient for engineers in evaluation and maintenance of high-speed railway bridges.

Download Full-text

Determination of the optimal curvature of the turnout diverging track for HSR using dynamic analysis

Transportation Overview - Przeglad Komunikacyjny ◽

10.35117/a_eng_17_10_01 ◽

2017 ◽

Vol 2017 (10) ◽

pp. 1-11

Author(s):

Władysław Koc ◽

Katarzyna Palikowska

Keyword(s):

Dynamic Analysis ◽

Analytical Method ◽

High Speed ◽

Extreme Points ◽

Point Of View ◽

High Speed Railway ◽

Zero Values ◽

Linear And Nonlinear ◽

Selection Of

The paper presents an analytical method of identifying the curvature of the turnout diverging track consisting of sections of varying curvature. Such turnout is mainly applied on High Speed Railway. Both linear and nonlinear (polynomial) curvatures of the turnout diverging track are considered in the paper. Obtained solutions enable to assume curvature values at the beginning and end point of the geometrical layout of the turnout.The paper focus on a fundamental and unexplained so far issue connected with selection of the most favourable curvature section from the operational requirements point of view. In order to determine the optimal curvature a dynamic analysis has been carried out on the several representative cases. It has been indicated that, used in railway practice, clothoid sections with nonzero curvatures at the beginning and end points of the turnout should be verified. It has been proved that the turnout with nonlinear curvature reaching zero values at the extreme points of the geometrical layout is the most favourable.

Download Full-text

Surrogate-Assisted Versus Subset Simulation-Based Stochastic Comparison Between Running Safety and Passenger Comfort Design Criteria of High-Speed Railway Bridges

10.3850/978-981-18-2016-8_577-cd ◽

2021 ◽

Author(s):

Reza Allahvirdizadeh ◽

Andreas Andersson ◽

Raid Karoumi

Keyword(s):

High Speed ◽

Design Criteria ◽

Stochastic Comparison ◽

Subset Simulation ◽

High Speed Railway ◽

Railway Bridges ◽

Passenger Comfort ◽

Running Safety ◽

Simulation Based

Download Full-text

Running Safety Estimation of Korean Style High Speed Railway Vehicle

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.270-273.1989 ◽

2004 ◽

Vol 270-273 ◽

pp. 1989-1994 ◽

Cited By ~ 2

Author(s):

Young Sam Ham ◽

Jai Sung Hong ◽

Taek Yul Oh

Keyword(s):

High Speed ◽

Railway Vehicle ◽

High Speed Railway ◽

Running Safety ◽

Safety Estimation

Download Full-text

Early-Warning Method of Train Running Safety of a High-Speed Railway Bridge Based on Transverse Vibration Monitoring

Shock and Vibration ◽

10.1155/2015/518689 ◽

2015 ◽

Vol 2015 ◽

pp. 1-9 ◽

Cited By ~ 2

Author(s):

You-Liang Ding ◽

Peng Sun ◽

Gao-Xin Wang ◽

Yong-Sheng Song ◽

Lai-Yi Wu ◽

...

Keyword(s):

Early Warning ◽

Transverse Vibration ◽

High Speed ◽

Vibration Monitoring ◽

Railway Bridge ◽

High Speed Railway ◽

Running Safety ◽

Pca Method ◽

Main Girder ◽

Fitting Model

Making use of long-term transverse vibration monitoring data of DaShengGuan Bridge, the early-warning method of train running safety of the high-speed railway bridge is established by adopting principal component analysis (PCA) method. Firstly, the root mean square (RMS) of the transverse acceleration of the main girder is used as the monitoring parameter for the train running safety. The correlation model between the RMS values measured from different positions is further adopted as the evaluating model for the train running safety. Finally, the effects of the environmental changes on the evaluating model are eliminated using the PCA method and the warning index for the train running safety is further constructed. The analysis results show that the correlation between the RMS values of the accelerations from different measuring positions on the main girder can be analyzed by a quadratic polynomial fitting model. The PCA method can effectively remove the environmental effects on the quadratic polynomial fitting model. The proposed warning method provides a good capability for detecting the abnormal changes of the measured transverse accelerations and hence it is suitable for early-warning of the train running safety.

Download Full-text