Citation

Selig ET, Li D. Transp. Res. Rec. 1994; 1470: 47-54.

Copyright

(Copyright © 1994, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

Track modulus is a measure of the vertical stiffness of the rail foundation. Another parameter, track stiffness, is a measure of the vertical stiffness of the entire track structure. Both are related to the track performance. In order to provide a basis for assessing and modifying track performance, the definitions of track modulus and track stiffness are reviewed, and four methods of determining track modulus or track stiffness are discussed. On the basis of analysis with a track structure model, the effects of superstructure and substructure factors influencing track modulus are illustrated and the means of altering track modulus are suggested. Finally, the relationship between the track modulus and track performance is discussed. The subgrade soil conditions are shown to have the greatest influence on track modulus and stiffness. Next in importance are the combined ballast-subballast thickness and the vertical tie-fastener stiffness.

Record URL:
http://onlinepubs.trb.org/Onlinepubs/trr/1994/1470/1470-006.pdf

Language: en

Keywords

Mathematical models; Railroad tracks; Performance; Structural analysis; Foundations; Stiffness; Deflection (structures); Soils; Bending (deformation); Differential equations; Elastic moduli; Elasticity