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| Influence Factors Analysis of Expansion and Contraction Force of Continuous Welded Rails on Long - span Cable - stayed Bridge |
| XU Hao1 ,LIU Hao2 ,LIN Hong - song1, YAN Hua1, WANG Ping2 |
| (1. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China;2. MOE Key Laboratory of High - speed Railway Engineering , Southwest Jiaotong University , Chengdu , Sichuan 610031 , China) |
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Abstract Abstract ： Research purposes ： The structure of cable - stayed bridge is a complicated special composite structure of “tower - cable - beam”. The bridge - rail interaction of continuous weldedrails is complex under the load effect. Taking a double - tower steel truss cable - stayed bridge commonly used in railway as an example, the calculation model of longitudinal force for continuous welded rail on cable - stayed bridge was established based on the theory of bridge - rail interaction. The influences of the main tower temperature, stayed cable temperature, main tower stiffness, main girder rigidity and supporting system on the expansion and contraction force of rail were analyzed for providing the theoretical basis for the design of continuous welded rail on long - span cable - stayed bridge. Research conclusions ： ( 1 ) The research shows with the increase of main tower temperature, the expansion and contraction force decreases. The greater difference of main tower temperature, the vertical displacement of main girder mainspan is greater. (2) With the increase of stayed cable temperature, the expansion and contraction force increases little, but the vertical displacement of main girder main span decreases sharply. (3) The variation of main tower stiffness has little effects on the expansion and contraction force. (4 ) The expansion and contraction forces are almost in the same with floating system and half floating system. The expansion and contraction force in the left beam crevice of main girder is decreased when using the tower beam fixed support system and consolidation system， but the expansion and contraction force in the right beam crevice of main girder is increased. The two kinds of support system were not recommended to use on railway long - span cable - stayed bridge. (5) The research results can provide the design of continuous welded rail on long - span cable - stayed bridge.
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Received: 08 October 2015
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2015, Vol. 32 
