Technical Reports

Parametric Analysis and Safety Concepts of CWR Track Buckling

  • 01
  • Dec
  • 1993
AUTHOR: G. Samavedam, A. Kish, A. Purple, J. Schoengart
OFFICE: RPD
REPORT NUMBER: DOT/FRA/ORD-93/26
SUBJECT: Track
KEYWORDS: Track Buckling, Dynamic Buckling, Lateral Stability, Continuous Welded Rail, Buckling Safety Limits, Parametric Study
ABSTRACT: The work reported here is part of a major investigation conducted by the Volpe National Transportation Systems Center for the Federal Railroad Administration on the thermal buckling of continuous welded rail (WER) track in the lateral plane with the objective of developing guidelines and recommendations for buckling prevention. This report presents results of the development and application of a personal computer software model for prediction of CWR track buckling strength. This model is based on the dynamic buckling theory previously validated by tests. The model accounts for all the important parameters influencing track buckling viz., rail size, curvature, lateral resistance, tie-ballast friction, fastener torsional resistance, track longitudinal stiffness, track vertical stiffness, misalignment amplitude and wavelength, and vehicle parameters. The sensitivity of the buckling temperatures with respect to each of the parameters is quantified, and critical parameters which strongly affect buckling strength are identified. A basis for buckling safety evaluation is presented. An approach using the computer program for the development of safety limits in the form of allowable rail temperatures as functions of track peak lateral resistance, misalignment amplitude and curvature, is presented. Conclusions of practical interest from the parametric study are presented.

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