Research on the Influence of Longitudinal Resistance of Fasteners on Mechanical Characteristics of Metro Turnouts

Research purposes: The fasteners are key component for transferring force in metro turnout, and its longitudinal resistance has an important impact on the force and displacement of each rail of the turnout. In order to clarify the longitudinal mechanical characteristics of metro turnout under different fastener rail pads and different longitudinal resistances, experimental tests and numerical simulation analysis were conducted on the fasteners. Research conclusions:(1)Compared with rubber pads, using polyester pads can reduce the longitudinal displacement of the basic rail of the turnout by more than 13%, reduce the longitudinal displacement of the guide rail by about 2%, and the longitudinal force on each rail of the turnout changes little.(2) As the longitudinal stiffness of the fastener increases, the longitudinal displacement of the turnout structure and the longitudinal force on the basic rail gradually decrease, although the temperature force of the guide rail increases slightly, but the increase is very small and will not affect the structural safety.(3)Using polyester pads in metro turnout and appropriately increasing the longitudinal stiffness of fasteners is a reasonable direction for optimization.(4)The research results can be applied to the selection of fastener rail pads for metro turnout fasteners and optimization design of resistance. © 2023 Editorial Department of Journal of Railway Engineering Society. All rights reserved.