Deformation Adaptability of Long-Span Cable-Stayed Bridge and Ballastless Track Structure

Taking a long-span cable-stayed bridge with CRTSⅠdouble-block ballastless track on the passenger dedicated line of a high-speed railway as an example, a refined nonlinear analysis model for the spatial interaction of ballastless track and bridge was established based on finite element method, by using nonlinear resistance models to simulate the resistance of fastener, the restraint of shear cam and the friction resistance of isolation layer. The deformation adaptability between ballastless track and long-span cable-stayed bridge was analyzed by calculating the vertical deformation curvature of track structure and bridge deck under the vertical load and temperature load of train, the interlayer compression amount of ballastless track and the rotation angle at beam end. Results indicate that, when the vertical load of train is in the midspan of cable-stayed bridge, it will cause each structure to have larger vertical deformation curvature. The vertical deformation curvatures of track structure and bridge deck under the same condition are similar in distribution rule and value. Compared with the results under train vertical load, the vertical deformation curvature of each structure under temperature load is smaller in value, but more complicated in distribution. Except that the local interlayer void occurs at the joint section under temperature rising and temperature dropping conditions, the interlayer of ballastless track is always compressed under loads. The rotation angles at beam end do not exceed the limit values in relative codes and have higher safety redundancy. © 2019, Editorial Department of China Railway Science. All right reserved.