United States Department of Transportation
i
Safety of High Speed Ground Transportation Systems: Track Lateral Shift: Fundamentals and State-of-the-Art Review
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1996-02-01
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[PDF-3.22 MB]
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Abstract:This report presents a review of the state of the art of track lateral shift analysis, with improved concepts for safety evaluation of high speed trains generating track shift forces. The mechanics of track shift and the resulting track failure modes are defined. A critical review of the track shift literature from France, England, Sweden, Japan and the United States is presented. The review reveals that the French National Railways (SNCF) has developed an in-depth understanding of the technical issues in track shift. The SNCF work identified the stable and progressive track shift phenomena due to high speed vehicle passage on curves and tangent tracks with misalignments. Track shift safety criteria, which are specific to their high speed operations, were experimentally developed. An approach is suggested in this report for an improved understanding and analysis of track shift for application to the U.S. track conditions. The proposed approach consists of a vehicle dynamic model to predict lateral loads on the track, and a track model to determine limit loads on the track and residual lateral deflections under the influence of the vehicle loads. The model can also evaluate the ride quality and potential for wheel climb derailment. The vehicle dynamic model is based on a lumped mass system, and maintains a rolling contact mechanism between the wheel and the rail. Preliminary numerical results are presented to demonstrate the applicability of the model in the study of track shift. The track model framework presented uses fundamental track parameters including the tie-ballast lateral resistance. Using the model, preliminary results are presented on the track limiting strength. A basis on which residual deflections of track under vehicle passage are quantified is also indicated. The proposed models will be fully developed in the next phase of this study.
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