FATIGUE LIFE OF CRITICAL MEMBERS IN A RAILWAY TRUSS BRIDGE

The fatigue life of critical members, such as hangers, floor beams and stringers in a single track, open deck railroad truss bridge, was investigated for various unit freight trains, operating at different speeds. A partial bridge model was used, along with a three-car train, to determine the stress cycles. For determining the fatigue lives of critical members, four fully-loaded trains per day were assumed to pass over the bridge. Each train was assumed to consist of one hundred, 70-ton cars or seventy, 100-ton cars. The 100-ton freight cars cause a larger stress range, and consequently shorter fatigue lives than the 70-ton freight cars. For the hundred car train, with 70-ton and 100-ton cars mixed in various proportions, the fatigue lives became shorter as the percentage of 100-ton cars in the consist was increased. The impact percentages were also studied.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 41 p.

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Filing Info

  • Accession Number: 00334730
  • Record Type: Publication
  • Report/Paper Numbers: AAR R-472 Tech Rpt.
  • Files: TRIS
  • Created Date: Jul 9 1981 12:00AM