Analysis and Design of New Floating Slab Track for Special Trackwork Using Finite Element Analysis (FEA)

Summary

This paper discusses Finite-Element Analysis (FEA) of a vibration-isolation system for double crossovers and turnouts in a future sub-way rail line extension. The previous design included ballasted track on continuous concrete slabs supported by natural rubber vibration isolators. The goal of the new design was to replace the ballast and tie track with rails fastened directly to discrete slabs similar to the vibration isolation system utilized on running portions of track within existing tunnels. FEA was used to evaluate the dynamic interaction between the vehicle, rails, resilient rail fasteners and the vibration isolation system. The results of the analyses guided the design in determining the size and thickness of the concrete slabs, the stiffness and design of the rubber vibration isolation pads and the rail fastener selection.