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| The Continuous - Slab - Track Coupling Laws between the Bridge and Track under Temperature Loads |
| CHEN Rong1，XING Jun1，XIE Kai - ze1，TIAN Chun - xiang2，WANG Ping1 |
| (1. MOE Key Laboratory of High - speed Railway Engineering， Southwest Jiaotong University， Chengdu，Sichuan 610031，China; 2. China Railway Eryuan Engineering Group Co. Ltd，Chengdu，Sichuan 610031，China) |
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Abstract Abstract : Research purposes ： The law of coupling interaction between bridge and track under temperature loads is the foundation to study CWR of CRTS II slab non - ballast track laid on bridge. In this paper，for the simply supported bridge and continuous bridge，the calculation model of multi - rails and integral bridges was built systematically. And rules and influencing factors of bridge - track coupling interaction were analyzed comprehensively and detailedly. Research conclusions:( 1 ) There is no obvious mapping relation between the rail expansion - contraction forces and beam layout. The rail expansion - contraction forces are symmetrical approximately，which is mainly determined by the longitudinal displacement distribution characteristics of the slabs. (2) The foundation plates are the key part of the bridge -track system. Its expansion and contraction affects the stress and deformation of the other parts in this system significantly. Terminal spines are the anchoring devices of foundation plates， and its stiffness directly decide the expansion and contraction displacements of foundation plates. ( 3 ) Affected by the relative displacement of the bridges and slabs， the longitudinal forces generated by sliding layer， 11 dual textiles" isolation layer or terminal spine would cause the change of longitudinal force of the foundation plate whose range is approximate to frictional or longitudinal force. (4) In the cooling conditions, bridge expansion - contraction has little influence on three - layer structure of rail - slab - foundation plate, but its fluctuation in joints is big. ( 5 ) The friction coefficient of sliding layer is extremely important and difficult to monitor in the track structure system，and increasing CA mortar adhesive force is good for the stress state of the track structure，so it is recommended to control the construction quality. (6) The research conclusions have certain guiding significance for the continuous - slab - track design theory optimization and engineering practice.
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Received: 16 March 2016
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2017, Vol. 34 
