Track structure interactions for the Taiwan High Speed Rail project

2011 ◽

Vol 97-98 ◽

pp. 3-9

Author(s):

Yang Wang ◽

Quan Mei Gong ◽

Mei Fang Li

Keyword(s):

Stress Distribution ◽

High Speed ◽

Design Theory ◽

Moving Load ◽

Structure Design ◽

Track Structure ◽

Beam Model ◽

High Speed Rail ◽

Slab Track ◽

Ballastless Track

The slab track is a new sort of track structure, which has been widely used in high-speed rail and special line for passenger. However, the ballastless track structure design theory is still not perfect and can not meet the requirements of current high-speed rail and passenger line ballastless track. In this paper, composite beam method is used to calculate the deflection of the track plate and in this way the vertical supporting stress distribution of the track plate can be gotten which set a basis for the follow-up study of the dynamic stress distribution in the subgrade. Slab track plate’s bearing stress under moving load is analyzed through Matlab program. By calculation and analysis, it is found that the deflection of track plate and the rail in the double-point-supported finite beam model refers to the rate of spring coefficient of the fastener and the mortar.The supporting stress of the rail plate is inversely proportional to the supporting stress of the rail. The two boundary conditions of that model ,namely, setting the end of the model in the seams of the track plate or not , have little effect on the results. We can use the supporting stress of the track plates on state 1to get the distribution of the supporting stress in the track plate when bogies pass. Also, when the dynamic load magnification factor is 1.2, the track plate supporting stress of CRST I & CRST II-plate non-ballasted structure is around 40kPa.

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Track Maintenance Scheduling and Its Interactions With Operations: Dedicated and Mixed High-Speed Rail (HSR) Scenarios

2010 Joint Rail Conference, Volume 2 ◽

10.1115/jrc2010-36125 ◽

2010 ◽

Cited By ~ 4

Author(s):

Hamed Pouryousef ◽

Paulo Teixeira ◽

Joseph Sussman

Keyword(s):

Preventive Maintenance ◽

High Speed ◽

Maintenance Scheduling ◽

Track Structure ◽

Maintenance Planning ◽

Critical Feature ◽

High Speed Rail ◽

Track Maintenance ◽

Operations And Maintenance ◽

Technical Specifications

HSRs are a complex system not only in terms of technical specifications, but also with respect to operations and maintenance over the track structure. Also, track structure is basically considered as the most important and costly railway asset. Its maintenance is vital to assure safety and operating practices are also of great importance to assure that a good level of service is provided. Considering track maintenance considerations over a new HSR line, one important and critical feature is the operational regime and the question of whether the line will be operated as mixed (passenger and freight) or dedicated only to passenger traffic. This can influence the maintenance patterns: preventive maintenance planning, maintenances scheduling and assignment issues. This will be different for the dedicated and mixed HSR traffic scenarios. In this research, the main approach is focused on the interactions between track maintenance planning and operational concerns and influences in these two scenarios. With this aim and within the current paper, a model of the preventive maintenance scheduling problem (PMSP) has been selected initially from Budai (2006) and then an upgraded revision of this model (Multi-segment assignment and scheduling of preventive maintenance problem) is introduced. Furthermore, the upgraded model of PMSP has been run over a given HSR line (Tehran-Qom HSR corridor in Iran) based on the comparison between the two scenarios of dedicated HSR and upgraded mixed HSR patterns. The main requirements, similarities and differences between these two scenarios are analyzed based on preventive maintenance scheduling and assignment requisites and interactions over the operating restrictions and considerations such as track possession patterns for maintenance activities. We conclude that decision making between these two scenarios through PMSP modeling are quite complicated and depends on the technical and operational specifications of the given HSR corridor, although some general comments on tradeoffs are possible.

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Track-Structure Interaction on the Taiwan High Speed Rail Viaducts

IABSE Symposium Report ◽

10.2749/222137803796329501 ◽

2003 ◽

Vol 87 (9) ◽

pp. 15-21 ◽

Cited By ~ 1

Author(s):

David Place ◽

Stuart Davis ◽

Michael Barron

Keyword(s):

High Speed ◽

Track Structure ◽

High Speed Rail ◽

Structure Interaction

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Railway superstructure for high-speed rails

Acta Polytechnica CTU Proceedings ◽

10.14311/app.2021.31.0053 ◽

2021 ◽

Vol 31 ◽

pp. 53-57

Author(s):

Lukáš Týfa ◽

Jan Kruntorád ◽

Ondřej Tomaschko

Keyword(s):

Research And Development ◽

High Speed ◽

Track Structure ◽

High Speed Rail ◽

Track Geometry ◽

Advantages And Disadvantages ◽

Ballastless Track ◽

Present Experience ◽

Long Time

The construction of the track is solved as a conventional (with track ballast) or as a ballastless track (without track ballast). When deciding on the choice of the most suitable track design for high-speed rail, it is necessary to emphasize that with increasing line speed, the requirements for the quality of the track geometry increase, including the size of the deviations of individual geometric parameters of the track from the projected values. When assessing the choice of track structure – especially for high-speed rails – it is therefore necessary and correct to assess the total costs (investment and operational) for a sufficiently long time. DB Netz AG’s present experience with a ballastless track since its first implementation in 1972 in Rheda station, for almost 50 years, shows that the required lifetime of 60 years has its real justification. In addition, current research and development in the field of ballastless track is moving towards extending the life of ballastless track well beyond this limit. The paper is focused on the comparison a ballasted and ballastless track construction. It deals in more detail with evaluation of the advantages and disadvantages of a ballastless track construction. The main objective is to assess the use of ballastless track structure for the construction of high-speed lines.

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