The Forsmo bridge is a 263m-long riveted steel truss arch railway bridge built in 1912. A 3-dimensional model of the structure was built in LUSAS Bridge in order to assess its potential to cope with freight trains with a 25t axle load. Groups of strain gauges were installed in carefully selected locations on the actual bridge to obtain information concerning the behaviour of the structure under in-service conditions. This information was used to refine the LUSAS model. The interaction between global and local effects was substantial, with stresses in some members changing by more than 100% from their initial values. An upgrade for the upper superstructure for 25t axle loads was considered but this gave a formal fatigue lifetime of only 10-30 years. Consequently total replacement of the upper superstructure is planned, to take 30t axle loads with a lifetime of 100 years.

  • Availability:
  • Corporate Authors:

    Institution of Structural Engineers

    11 Upper Belgrave Street
    London,   United Kingdom  SW1X 8BH
  • Authors:
  • Publication Date: 2002-7-2


  • English

Media Info

  • Pagination: p. 16
  • Serial:
    • Structural Engineer
    • Volume: 80
    • Issue Number: 13
    • Publisher: Institution of Structural Engineers
    • ISSN: 1466-5123

Subject/Index Terms

Filing Info

  • Accession Number: 00928870
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 2 2002 12:00AM