One of the major technical developments in railway technology since the war has been increasingly widespread adoption of continuous welded rail. However, one obstacle still stands in the way of producing "ideal" jointless track, namely the existence of railway bridges. Temperature variations at the mobile ends of bridges create additional stresses in the rails which can affect track stability or cause rails to fracture. Various railway networks have already carried out research and drawn up regulations on the subject, but it was felt necessary to go into the subject in still greater depth so that principles and guidelines, if not regulations, could be formulated. ORE Committee D 101 is responsible for this research, and as part of the ORE programme, the R.A.T.P. has carried out two series of measurements described by the author, who also gives details of the results obtained and draws a number of conclusions applicable to heavy concrete structures, including the high degree of thermal inertia of this type of structure and the contribution of the ballast to thermal insulation, the resulting lower maximum stresses in the rails and the fact that, in the medium or long term, the "mean" temperature of the structure can be defined and changes in length can be calculated using the laws of physics. The ORE is continuing its research on different types of bridge and is attempting to draw up a mathematical formula based on the results obtained from the various measuring programmes.

  • Corporate Authors:

    North Oxford Academic Publishing Limited

    242 Banbury Road
    Oxford OX2 7DR,   England 
  • Authors:
    • Colnat, J
  • Publication Date: 1984-2


  • French

Media Info

  • Pagination: p. 1-14
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00386228
  • Record Type: Publication
  • Source Agency: British Railways
  • Files: TRIS
  • Created Date: Jun 28 1984 12:00AM