Abstract：Research purposes:The structure of cable － stayed bridge is a complicated spacial composite structure of" tower － cable － beam" ． After the laying continuous welded rails，a " tower － cable － beam － track" coupling system is formed under the load effect ，with the complicated mechanical transmission mechanism of continuous welded rails．Taking the Anqing Yangtze River Bridge as an example，a " tower － cable － beam － track" spatial coupling model is established for calculating the longitudinal force of continuous welded rails on long － span cable － stayed bridge to analyze the influences of the different system temperature，the modified elastic modulus of the cable，longitudinal resistance model and the fastening with small resistance for providing the theoretical basis for the design of CWR on long －span cable － stayed bridge．
Research conclusions:The research result shows with the increase of the variation range of the system temperature of the cable － stayed bridge，the expansion － constriction force increases obviously． The modified elastic modulus of cable has less effect on the additional expansion － constriction force and braking force，but has big effect on the additional flexural force． The additional expansion － constriction force calculated by using two different longitudinal resistance models are almost the same，but there is distinct discrepancy in the calculation results of the flexural force and braking force．Application of the fastenings with small resistance can decrease the additional longitudinal force in CWR，so it should be used for the CWR on the side span of the cable － stayed bridge and on the approach bridges on consideration of the engineering cost．
李艳. 大跨斜拉桥上无缝线路纵向力的变化规律研究[J]. 铁道工程学报, 2012, 29(10): 42-46.
LI Yan. Study on Variation Rules of Longitudinal Force of Continuous Welded Rails on Long － span Cable － stayed Bridge. 铁道工程学报, 2012, 29(10): 42-46.
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Li Yan．Research on Design Method of Welded Track on Large Multiple Span Continuous Beam Bridge［J］． Journal of Railway Engineering Society，2004(12) : 81－83．
Li Zhihong．Research on the Node Space of Fastening at End of Bridge Beam for Intercity Rail Transit［J］． Journal of Railway Engineering Society ，2009(8) : 64－67．
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2012, Vol. 29 
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