High strength and high conductive copper-based alloy produced by SPD for contact wires for high speed railway lines - A short review

Concrete bridges on high-speed railway are usually constructed with high strength concrete. Because of shrinkage of concrete, large stress and deformation always appear in construction and operation process of bridges. It even leads to concrete cracking. So as to guarantee the safety of structures and smoothness of tracks, correct calculation of concrete shrinkage effect must be done. Concrete shrinkage effect is a very complex non-stress strain problem which is influenced by numerous factors and difficult to calculate. According to the factors considered from different emphasis aspects, a variety of patterns or specifications are formed based on different domestic and foreign models of concrete shrinkage calculation. Combined with the construction of Jiangshan Harbor Bridge (75+2×135+75) m prestressed concrete continuous beam bridge on Hangzhou-Changsha high-speed railway, concrete shrinkage field tests and measurements were carried in which the same mix of high strength concrete as that of the bridge was used. The results of tests and measurements were compared with results of different theoretical models. The effects of high strength concrete shrinkage on high-speed railway concrete bridges were studied and some useful conclusions were obtained.

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Fatigue failure analysis of high strength bolts used for high-speed railway vehicle braking discs

Engineering Failure Analysis ◽

10.1016/j.engfailanal.2020.104661 ◽

2020 ◽

Vol 115 ◽

pp. 104661

Author(s):

Xunliang Shen ◽

Liantao Lu ◽

Dongfang Zeng

Keyword(s):

Failure Analysis ◽

Fatigue Failure ◽

High Speed ◽

High Strength ◽

Railway Vehicle ◽

High Speed Railway

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Experimental Study on the Maximum Allowable Hydration Temperature for 900t Box Girder of High-Speed Railway

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.90-93.964 ◽

2011 ◽

Vol 90-93 ◽

pp. 964-968

Author(s):

Xue Min Li ◽

Er Yu Zhu ◽

Yong Zheng Zhou ◽

Yue Hong Qin

Keyword(s):

Experimental Study ◽

High Strength Concrete ◽

High Speed ◽

High Strength ◽

Maximum Temperature ◽

Railway Bridge ◽

Box Girder ◽

High Speed Railway ◽

Technical Guide ◽

Allowable Temperature

Due to the usage of high-strength concrete, excessive hydration heat is generated in the whole span box girder of high-speed railway. The maximum allowable temperature should not exceed 60°C according to the Technical Guide on Railway Bridge Construction of Passenger Dedicated Line. However, according to the field measurement and simulation to the maximum temperature of box girder concrete, we find that the maximum hydration temperature of concrete is generally more than 60°C which is the limited value of the specification. The research results show that the limited value of maximum hydration temperature for box girder concrete can be relaxed to 65°C.

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Research on the Springback Quantity of the Load Test on High-Speed Railway

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.99-100.414 ◽

2011 ◽

Vol 99-100 ◽

pp. 414-419

Author(s):

Ju You Chang ◽

Zhi Jun Liu

Keyword(s):

Prestressed Concrete ◽

High Speed ◽

Technical Specification ◽

High Strength ◽

Maximum Load ◽

Load Test ◽

High Speed Railway ◽

Static Test ◽

Design Load ◽

Under Construction

With the development of high-speed railway, roadbed reinforcement of its use of high strength prestressed concrete pipe pile, and reflected wave method with low strain and slow preloading method for integrity testing of the pile and pile load test, according to “Technical specification for testing of railway piles” TB10218-2008 requirements, slow static test of the maximum load of not less than 2 times the design load; pile field under construction, the pile placed on top of limestone , pile bearing stratum good features, especially more complete proposed limestone pile placed on top of limestone (rock) of the pipe, the static test pile to take the maximum load of 1.2 times the design load, and load and take Q-s curve of settlement, maximum springback quantity and the corresponding settlement is vertical bearing capacity characteristic value of single pile.

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