ESTIMATE OF STATIC TRACK MODULUS USING ELASTIC FOUNDATION MODELS
A new method for calculating the track modulus by using elastic properties of the individual track support components is developed. The properties include (a) the stiffness of the rail pad, (b) the vertical stiffness and bending rigidity of the tie treated as a beam on both a Winkler foundation and two-parameter foundation, and (c) the Young's moduli and Poisson's ratio values of the soil layers underlying the track. Semi-infinite elastic foundation theories are used to estimate the equivalent ballast/subgrade stiffness distributed along the length of the tie. Track modulus charts and application examples are given for typical track support structures used in North America. A practical benefit of the new approach proposed is that it eliminates the need to carry out relatively expensive field tests. An overview of some existing methods to determine track modulus is also presented. The validation of the proposed method is currently in progress.
- Record URL:
- Record URL:
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0309061016
-
Supplemental Notes:
- This paper appears in Transportation Research Record No. 1470, Railroad Research Issues. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
-
Authors:
- Cai, Z
- Raymond, G P
- Bathurst, R J
- Publication Date: 1994
Language
- English
Media Info
- Features: Figures; References; Tables;
- Pagination: p. 65-72
- Monograph Title: Railroad research issues
-
Serial:
- Transportation Research Record
- Issue Number: 1470
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Modulus; Modulus of elasticity; Poisson distributions; Poisson ratio; Railroad ties; Railroad tracks; Stiffness; Subgrade (Pavements)
- Uncontrolled Terms: Subgrade (Railroads); Track modulus
- Old TRIS Terms: Bending rigidity; Rail pads; Vertical stiffness
- Subject Areas: Geotechnology; Highways; Railroads;
Filing Info
- Accession Number: 00677728
- Record Type: Publication
- ISBN: 0309061016
- Files: TRIS, TRB
- Created Date: May 22 1995 12:00AM