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FE Analysis of Longitudinal Dynamic Response of Subgrade in Bridge-Subgrade Transition of heavy haul railway

Journal of Civil Engineering and Architecture 2010年第5期4卷 52-59页

作者： Shengchuan Liu Guiling Ding Lianjun Wang Jianguo Chen Research Institute of Highway Ministry of Transport Beijing 100088 China School of Civil Engineering Beoing Jiaotong University Beoing 100044 China

With the increase of axle load and the train speed, dynamic interaction of train-track system becomes so exacerbated that the deformation and dynamic response of subgrade are more aggravated. The differential settlement will be created in bridge-embankment transition section under such dynamic action, and an adverse effect on the train operation safety can be caused. Meanwhile, differential settlement will produce additional dynamic effect when high-speed trains go through the transition between bridge-embankment. Such dynamic action will aggravate the differential settlement and subgrade damage. This paper applies the methods of field test and finite-element to systematically study the dynamic response characteristics of subgrade in bridge-embankment transition section of heavy haul railway under dynamic load for the first time. This research is focused on the analysis of influence of the different axle load, train speed, filled soil modulus, etc.. At last, the dynamic response rules are systematically summarized.

关键词： heavy haul railway bridge-embankment transition section dynamic response finite-element method.

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Application Study on Elastomer Expansion Joint in heavy haul railway

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Journal of Civil Engineering and Architecture 2015年第9期9卷 1047-1053页

作者： Leran Wang Bin Niu Yonghua Su railway Engineering Research Institute Chinese Academy of Railway Science Beijing 10081 China

The article summarizes related research results and achievements of elastomer expansion device in railway bridge and puts forward a new idea of using polyurethane elastomer material to seal concrete bridge joints between adjacent spans in heavy haul railways. The new type expansion device is composed of polyurethane elastomer material and named TTXF （elastomer expansion joint）. In theory, researchers find out expansion joint deformation regularity between adjacent bridge spans through theoretical analysis and detection in heavy haul railways, such as Datong-Qinhuangdao railway and Shenchi-Huanghua Port railway. Fatigue tests prove that TTXF can adapt to permanent and dynamic deformation. On the other hand, it has been successfully applied in the test section of Central South of Shanxi railway Passage and continuous monitoring has been conducted in extreme weather for over one year. The expansion joint has a good effect practically.

关键词： heavy haul railway bridge elastomer expansion joint

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heavy-AXLE LOAD MECHANICAL EFFECTS ON railway TRACKS

HEAVY-AXLE LOAD MECHANICAL EFFECTS ON RAILWAY TRACKS

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铁道工程新技术：第二届铁道工程关键技术国际学术会议

作者： Fangyuan ZHENG Qingchao WEI School of Civil Engineering Beijing Jiaotong University Beijing 100044

＜正＞The train-track-subgrade vertical vibration system model is established to analyze the mechanical response of railway track structure under heavy axle train *** stress and vertical displacement of rail,stress of ballast and subgrade under 35.7 t axle load are given in ANSYS *** analyses of the impact of increase in axle loads from 25 t to 40 t on the mechanical responses of the track structure are carried out after that.

关键词： heavy haul railway track structure mechanical characters

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