The fundamental mechanics of track lateral shift due to vehicle and thermally induced loads are defined, and an analytic approach is presented for the determination of 'limit' loads and deflections on the track to prevent progressive lateral shift. The proposed approach consists of the coupled use of a comprehensive vehicle-track dynamic model to evaluate the lateral loads on the track, and a 'dynamic' track lateral response model to determine the residual lateral deflections under multiple load passes. The lateral response model is augmented by a track vertical deflection model for the determination of the 'vertically loaded lateral resistance'. The lateral response model simulates moving loads, and includes a nonlinear tie-ballast lateral resistance idealization. Results of baseline parametric studies accounting for the influences of lateral resistance, curvature, longitudinal force, and other vehicle and track parameters are given, 'limiting' lateral to vertical load ratios (L/Vs) are identified, and stable and unstable regimes of track shift under high speed operating conditions are predicted. Prototype safety criteria for track shift mitigation are proposed based on net axle load (NAL/V) limits versus 'allowable' lateral track displacements. This work is part of the US DOT/Federal Railroad Administration's research effort to develop the technical information required to establish 'safe' operating practices for high speed tracks.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Fundamentals of Track Lateral Shift for High-Speed Rail Applications


    Contributors:
    A. Kish (author) / G. Samavedam (author) / D. Wormley (author)

    Publication date :

    2004


    Size :

    29 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Fundamentals of Track Lateral Shift for High-Speed Rail Applications

    A. Kish / G. Samavedam / D. Wormley | NTIS | 2000


    New Track Shift Safety Limits for High-Speed Rail Applications

    A. Kish / G. Samavedam / D. Wormley | NTIS | 2007


    New track shift limits for high-speed rail

    Kish, A. | British Library Online Contents | 2001


    Analysis of lateral track strength for high speed rail

    Chrismer, Steven M. | Tema Archive | 2005