Study on the eccentricity between the ballast track and supporting bridge under the action of moving trains

In order to study the intrinsic law of the eccentricity between the ballast track and supporting bridge under the action of moving vehicles, this paper developed a track-bridge coupled model considering the complex interactions among the components of the ballast track and the coupling effects between the track and bridge based on a multi-span continuous concrete deck arch bridge located in the Shi-Tai railroad. The influence of structural parameters of the ballast track wasextensively investigated upon the development of the eccentricity between the track and bridge. It wasfound that with the increase of the lateral stiffness of fasteners the maximum value of eccentricity can be reduced. The lateral rigidity of the sleeper with respect to the ballast track has minor effect on the eccentricity between the track and bridge, while the influence of the lateral shear stiffness in-between the adjacent ballast blocks and lateral stiffness at the interface of track and bridge can be neglected. As the thickness of ballast track decreases, the maximum eccentricity between the track and bridge decrease accordingly. The super-elevation of the outer rail has limited effect on eccentricity between the track and bridge. With the increase of the initial eccentricity between the ballast track and bridge, a more rapid successive development of the eccentricity is expected between center-lines of the ballast track and supporting bridge. © 2021, Central South University Press. All rights reserved.