Geometric, behavioral, and loading complexities create difficulties in analytical approaches to the prediction of track performance characteristics. The use of model testing as an alternative to more-expensive full-scale testing in providing direct results, as well as data for analytical correlation, is discussed in this paper. Equations of similitude are presented, and the choice of model scales and materials is considered. Model track systems at a linear scale-reduction factor of 6 were constructed and tested. The test variables were tie shape and spacing. Vertical and longitudinal repeated loads were applied in phase, and deformations were measured at various points in the structure. The conventional tie shape was found to be marginally superior to others tested, except for resistance to longitudinal loads. Minimizing tie spacing (or maximizing contact area) was found to be important for resisting continued settlements. The main purpose of the tests, however, was to demonstrate that model studies are capable of producing reliable results. Successful correlation with full-scale test results was achieved from the simplified model, and it is suggested that more-sophisticated real models could produce direct design information at significant savings in research resources.

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 21-28
  • Monograph Title: Mechanics of track support, piles and geotechnical data
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00315295
  • Record Type: Publication
  • ISBN: 0309029880
  • Files: TRIS, TRB
  • Created Date: Sep 16 1980 12:00AM