ASSESSMENT OF FATIGUE LIFE OF A STEEL GIRDER BRIDGE IN SERVICE

To assess the fatigue life of welded, cover-plated steel girders, strain gauges were placed in critical locations on the superstructure of the Leslie Street overpass on the Toronto Bypass. Data were gathered for 200 hours in 12-hour continuous tape recording sessions. Analysis of the data revealed that normal traffic caused a live-load stress peak of 4,000 psi (2757 MPa) only once in 10 hours, which is less than 50 percent design live-load stress. Stress data gathered by various agencies during the past few years seem to indicate that either design stress does not occur at all or it occurs with such a low frequency that the development of any fatigue situation is precluded. The phenomenon is associated with the low probability of the simultaneous, multiple presence of loaded commercial vehicles on a structure. The problem is therefore statistical in nature. Its recognition appears to be in conflict with the prevailing concept used in fatigue consideration of highway bridges.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 26-44
  • Monograph Title: Bridge design
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00265550
  • Record Type: Publication
  • ISBN: 0309023505
  • Files: TRIS, TRB
  • Created Date: Feb 11 1975 12:00AM