Concrete Crack Control in Monolithic Concrete Bed Construction of High-Speed Railway in Northwest Area of China

2013 ◽  
Vol 405-408 ◽  
pp. 3081-3085
Author(s):  
Xian Xi Tang ◽  
Yan Peng Zhu ◽  
Xian Zhou Tang ◽  
Wei Guo
Keyword(s):  
High Speed ◽  
Control Measures ◽  
Specific Situation ◽  
Construction Technology ◽  
High Speed Railway ◽  
Mixture Ratio ◽  
Crack Control ◽  
Concrete Crack ◽  
Cracking Control ◽  
Study Results

There were some reasons which cause the concrete cracks in monolithic concrete bed construction of high-speed railway. In this paper, combined with the specific situation of monolithic concrete bed construction of high-speed railway in northwest area of China, the states and causes of two kinds of cracks in monolithic concrete bed of high-speed railway were analyzed, the concrete cracking control measures were discussed from the concrete mixture ratio, construction technology and maintenance measures and other aspects, and the corresponding views were put forward. The study results had the important guiding significance on crack controls of concrete structure during the construction process of northwest area.

On prospects for the development of high-speed railway lines in Russia

2017 ◽  
pp. 7-14
Author(s):  
Nikolay Bushuyev ◽  
Darina Shulman
Keyword(s):  
Russian Federation ◽  
High Speed ◽  
Network Formation ◽  
Practical Importance ◽  
High Speed Railway ◽  
Complex Approach ◽  
Study Results ◽  
High Speed Trains ◽  
The Russian Federation ◽  
Traffic Organization

Objective: To consider the prospects for the development of high-speed railway lines (VSM) in Russia. To analyze the fundamentals of “Updated program of high-speed railway communication on the territory of the Russian Federation” approved on November, 23rd 2015 by the decision of OAO “RZhD” board meeting and the social board on the issues of high-speed railway communication in Russia. To formulate the specificities of high-speed traffic organization: promising directions of high-speed headings realization before 2030, as well as the stages of their implementation in Russia. Methods: Multiple regression analysis, as well as the method of multi criterial decisions optimization was applied in the study. Results: The analysis of current and perspective headings was carried out, as well as such characteristics as speed and the running time of “Sapsan” high-speed trains and “Allegro”, “Strizh”, “Lastochka” rapid trains. Special attention was paid to the comparison of strategies given in “Updated program of high-speed railway communication on the territory of the Russian Federation” with the main scientific findings stated in VSM network formation part, obtained on the basis of complex approach to the solution of justification of VSM network formation stage-by-stage approach, taking into account multi criterial estimation of cities and regions’ potential and application of mathematical traffic flow model approach as part of basic regional socioeconomic indices of cities and regions, situated in the zones attractive for future VSM construction. Practical importance: The conclusion was made on the necessity to continue exploratory development in the sphere of topology specification research and stage-by-stage formation of the first VSM in Russia.

Ballast Flying DEM Microscopic Analysis and Counteracting Measures

2011 ◽  
Vol 97-98 ◽  
pp. 266-270 ◽  
Author(s):  
Guo Qing Jing ◽  
Liang Gao ◽  
Xiao Lin Sun
Keyword(s):  
Friction Coefficient ◽  
Microscopic Study ◽  
High Speed ◽  
Microscopic Analysis ◽  
Dynamic Force ◽  
High Speed Railway ◽  
Model Method ◽  
Study Results

Ballast flying problems obsess the high speed railway developments, causing damages to the train and deteriorations to the rail. In the paper, DEM is used to conduct ballast flying mechanism microscopic study, results show ballast flying increases with train dynamic force, and decreases with ballast size and friction coefficient, ballast flying counteracting measures are presented, such as ballast bed parameter and ballast glue. In the end, future possible microscopic ballast flying model method is presented by DEM coupled with CFD.

A High-Speed Railway Data Placement Strategy Based on Cloud Computing

2011 ◽  
Vol 135-136 ◽  
pp. 43-49
Author(s):  
Han Ning Wang ◽  
Wei Xiang Xu ◽  
Chao Long Jia
Keyword(s):  
Cloud Computing ◽  
High Speed ◽  
Data Access ◽  
Interval Mapping ◽  
Data Placement ◽  
Programming Algorithm ◽  
High Speed Railway ◽  
Mapping Algorithm ◽  
Data Intensive ◽  
Study Results

The application of high-speed railway data, which is an important component of China's transportation science data sharing, has embodied the typical characteristics of data-intensive computing. A reasonable and effective data placement strategy is needed to deploy and execute data-intensive applications in the cloud computing environment. Study results of current data placement approaches have been analyzed and compared in this paper. Combining the semi-definite programming algorithm with the dynamic interval mapping algorithm, a hierarchical structure data placement strategy is proposed. The semi-definite programming algorithm is suitable for the placement of files with various replications, ensuring that different replications of a file are placed on different storage devices. And the dynamic interval mapping algorithm could guarantee better self-adaptability of the data storage system. It has been proved both by theoretical analysis and experiment demonstration that a hierarchical data placement strategy could guarantee the self-adaptability, data reliability and high-speed data access for large-scale networks.

Performance-Based Design Research on a Long-Span High-Speed Railway Suspension Bridge

2019 ◽  
Author(s):  
Xiaoguang Liu ◽  
Hui Guo ◽  
Xinxin Zhao ◽  
Pengfei Su ◽  
Mangmang Gao
Keyword(s):  
High Speed ◽  
Rotation Angle ◽  
Suspension Bridge ◽  
Performance Based Design ◽  
Live Load ◽  
Stay Cable ◽  
Expansion Joint ◽  
High Speed Railway ◽  
Track Geometry ◽  
Study Results

<p>A performance-based design (PBD) framework for high-speed railway suspension bridge is proposed from aspects of structural, operational and public requirements. Stiffness indexes are discussed. Results show that target performance shall include stiffness, strength, fatigue, stability, track geometry, train operation performance, human safety and public loss, etc. Case study results of a high-speed railway suspension bridge show that large cable force provide gravity stiffness with the vertical deflection to main span length is 1/488 under static live load. The longitudinal displacement (LD) is restricted to a proper value by arrangement of inclined stay cable at the mid-span and the viscous dampers between pylon and stiffening girder. LD at girder end under the total live load is 261mm. And the longitudinal drift mode shape appears later than symmetrical transverse and vertical bending. The vertical rotation angle at girder end is only 0.77‰ under ZK load (0.8UIC) for passenger-dedicated line by setting auxiliary pier at side span of the bridge. Considering the operational performance, elastic deformation of wind-resistant bearings at girder end shall be restricted to decrease the transverse rotation angle which has the limit value from 1.0‰ to 2.5‰ under different train speed. And the integral design of bridge expansion joint (BEJ) and rail expansion joint (REJ) at girder end is required.</p>

Admixtures in Concrete Crack Control and Construction Technology Optimization

2010 ◽  
Vol 163-167 ◽  
pp. 1115-1120
Author(s):  
Ran Gang Yu ◽  
Xin Hu Wang
Keyword(s):  
Cooling Water ◽  
Design Calculation ◽  
Mass Concrete ◽  
Construction Technology ◽  
Element Analysis ◽  
Crack Control ◽  
Whole Process ◽  
Concrete Crack ◽  
Expansive Agent ◽  
Important Means

This paper studies properties of concrete under the action of water-reducing retarder and expansive agent; gives the optimal design calculation method of cooling water pipe in the construction technology: mainly considering pipe’s diameter, distance, cooling water’s flow, temperature, time etc; studies the optimization to the concretes construction method. Midas/Civil, one finite element analysis soft-ware, analyses mass concrete construction of the whole process of the temperature field and stress field in the numerical simulation, considering the admixtures and construction technology. The results show that commonuse of admixtures and reasonable construction technology are the important means of controlling cracks.

Telecommunication systems and high-speed railway transport networks

2017 ◽  
pp. 28-46
Author(s):  
Andrey Kanayev ◽  
Andrey Pryvalov ◽  
Vladimir Kotov ◽  
Arkadiy Lebedinskiy ◽  
Pavel Plekhanov ◽  
...  
Keyword(s):  
Control System ◽  
Information Security ◽  
Cyber Security ◽  
High Speed ◽  
Telecommunication Networks ◽  
Theory Approach ◽  
Railway Transport ◽  
High Speed Railway ◽  
Study Results ◽  
The Given

Objective: To consider the main approaches to organization of systems and communication networks on high-speed railway transport and provide cyber security on the basis of current international and home practice in the given sphere. Methods: Game-theory approach, hierarchy analysis method as well as topological transformation of stochastic networks were applied in the given study. Results: It was detected that a single realization of organizational and technical measures on cyber security cannot provide strong security from threats of cyber security during a long period of time; the latter is connected with constant development of data infrastructure, modification of methods, as well as the methods of attacks, potential attacker opportunities and other factors. Telecommunication networks’ security (TKS) of OJSC “Russian railways” and high-speed railway lines (VSM) from cyber impact is a systemic problem, for the solution of which fundamental research studies are to be conducted, aimed at the detection of basic patterns of information confrontation and directions of TKS cyber security provision and, subsequently, research and development activities for creating an automated communication control system of OJSC “Russian railways” and VSM, the constituent part of which is a subsystem of TKS information security. It is advisable to create an expert council based at regional transport universities, which provide extensive analysis conduct of systems and means of providing information security offered by the industry, as well as cyber security of OJSC “Russian railways” and VSM critically important systems including TKS. Practical importance: The realization of the suggested approach to OJSC “Russian railways” and VSM cyber security provision will make it possible to form the conditions for safe functioning of elements of information infrastructure, provide the creation, effective functioning and the improvement of cyber security control system, as well as to minimize damage from possible attack attempts.

Numerical simulation of rail surface-initiated rolling contact fatigue in the switch panel of railway turnouts

2020 ◽  
pp. 095440972090997
Author(s):  
Xiaochuan Ma ◽  
Ping Wang ◽  
Jingmang Xu ◽  
Rong Chen ◽  
Linya Liu
Keyword(s):  
Friction Coefficient ◽  
Fatigue Damage ◽  
High Speed ◽  
Interaction Analysis ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Control Measures ◽  
High Speed Railway ◽  
Friction Control

Considering the complex characteristics of the track structure in railway turnouts, it is difficult and also expensive to experimentally study rail damages; therefore, numerical methods are an effective alternative. This study presents a numerical method to simulate rail surface-initiated rolling contact fatigue in the switch panel of railway turnouts. This method includes simulation of the vehicle–turnout wheel–rail dynamic interaction, analysis of the wheel–rail multipoint non-Hertzian rolling contact that considers the relative motion between the switch and stock rails, and calculation of the accumulated rail surface-initiated rolling contact fatigue. The accumulated rail surface-initiated rolling contact fatigue after the vehicles passed a turnout switch panel 80 times (the average number of vehicles running on the Chinese high-speed railway lines per day) in the through route with facing move was simulated based on this procedure. The result showed that the maximum surface-initiated rolling contact fatigue damage of the switch rail and the stock rail was 1.57 × 10−2 and 0.62 × 10−2, respectively. Surface-initiated rolling contact fatigue in the switch rail mainly occurred at the gauge angle, and in the stock rail it mainly occurred at the center of the rail. In addition, the influence of track parameters (rail inclination, track gauge, and friction coefficient) is analyzed. The friction coefficient influenced the rail surface-initiated rolling contact fatigue. When the coefficient exceeded 0.3 in particular, the rail rolling contact fatigue damage increased sharply. Hence, suitable friction control measures should be taken during rail maintenance in order to mitigate the rail surface-initiated rolling contact fatigue damage, e.g. by keeping the wheel–rail friction coefficient below 0.3.

Analysis the Noise Sources and Control Measures of High Speed Railway

2014 ◽  
Vol 525 ◽  
pp. 301-304 ◽  
Author(s):  
Hai Yan Zhu ◽  
Ping Bo Wu ◽  
Jing Zeng ◽  
Wan Xiu Teng
Keyword(s):  
High Speed ◽  
Human Life ◽  
Noise Pollution ◽  
Living Environment ◽  
Control Measures ◽  
Practical Significance ◽  
Aerodynamic Noise ◽  
Noise Sources ◽  
High Speed Railway ◽  
Railway Noise

High speed railway noise caused serious noise pollution to human living environment around the railway. This article mainly analyzes the causes and characteristics of the high-speed railway noise from the wheel/rail noise, aerodynamic noise and collector system noise. And take these three aspects as objects, the high-speed railway noise control measures are detailed analyzed to reduce the high speed railway noise harmful to the environment and human life, which has more practical significance to human being.

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