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| Longitudinal Force Analysis of Tram Embedded Track on Simply Supported Bridge |
| FENG Qing-song1，SUN Kui1，LUO Xin-wei2，LIU Qing-jie1，ZHANG Peng-fei1 |
| (1.East China Jiaotong University, Nanchang, Jiangxi 330013, China; 2.Guangzhou Metro Design and Research Institute, Guangzhou, Guangdong 510010, China) |
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Abstract Abstract：Research purposes： The interaction between rail and beam of CWR on bridge is really complex, and the stress and deformation characteristics of bridge and track structure become a hot research topic of scholars at home and abroad. In order to study the force and deformation and influence factors of track structure under temperature load, train load and braking load, according to the characteristics of the embedded track, the finite element model of embedded track CWR on bridge is established, the force and deformation of the track structure under three conditions are calculated, such as expansion-constriction force, deflection force and braking force, the influence of beam temperature difference, the longitudinal resistance of polymer material and the longitudinal stiffness of the pier on the expansion-constriction force is analyzed. Research conclusions： (1) The longitudinal resistance and vertical stiffness of the embedded track are linear, and the relative displacement limit between rail and substructure is determined to be 6.2 mm. (2) The force and deformation of track structure increase linearly with the increase of beam temperature difference, and the allowable beam temperature difference is 38 ℃;With the increase of the longitudinal resistance of the track, the longitudinal displacement and the expansion- constriction force of the rail increase gradually, while the relative displacement between rail and substructure decreases gradually; The longitudinal stiffness of the bridge piers has little effect on the force and deformation of the track structure. (3) Under the condition of deflection force and braking force, the relative displacement between rail and substructure and the additional force of rail are small, so the expansion-constriction force condition should be paid attention to in the design. (4) When the beam temperature difference and the change of the rail temperature is 30 ℃, the strength of rail and the relative displacement between rail and substructure meet the requirements. Therefore, it is feasible to lay the embedded track on 32 m simply supported beam. (5) The research results have reference value for the design of tram embedded track on bridge.
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Received: 01 September 2017
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2017, Vol. 34 
