Author(s): WU Qingsong, REN Juanjuan, LIU Xueyi, LIU Huan, MOE Key Laboratory of High - speed Railway Engineering, Southwest Jiaotong University, School of Civil Engineering, Southwest Jiaotong University
Pages: 414-422
Year: 2016 Issue:  3
Journal: Journal of Changsha Railway University
Keyword:  railway engineering; CRTS Ⅱ slab track; concrete underlayer; large span continuous beam bridge; expansion length; limit state method;
Abstract: Although the structure of large span concrete bridge is widely used in China high- speed railway,the critical expansion length of large span concrete bridge still remains uncertain during the design of CRTS Ⅱ slab track on bridge. The nonlinear spatial rail- slab- bridge- pier integrated mechanical model was established based on the characteristics of CRTS Ⅱ slab track on bridge. And the corresponding finite element model was established in finite element software ABAQUS. With the increasing of expansion length,the stress and deformation characteristics of the track structure were studied under different load cases. Both the design theory of CWR on bridge and limit state method were used to track structure check- calculation in force and deformation. The result shows that different track structure has different degrees of growth with the increasing of expansion length.Among the load cases,contractility caused by bridge temperature has a greater influence. When the expansion length reaches 496 m,the stress and deformation of the rail and track slab are not achieved the limitations,but the concrete underlayer has reached the serviceability limit state at this time. Therefore,it is suggested that the ultimate expansion length of the large span continuous beam bridge used for laying the CRTS Ⅱ slab track should not be greater than 496 m.