The fatigue behavior of welded steel beams is evaluated by using the fracture-mechanics concepts of stable crack growth. A fracture-mechanics model for cracks originating from the pores in the web-to-flange fillet weld is developed. Estimates of the stress-intensity factor are made that numerically describe the initial flaw condition. With the final crack size known, a theoretical crack-growth equation was derived from the fatigue test data of the welded beams. The derived relationship compares well with actual crack-growth measurements on a welded beam and available data from crack-growth specimens. The regime of crack growth, where most of the time is spent growing a fatigue crack in a structural element, is shown to correspond to growth rates below 10 to the minus 6 power in. per cycle. Few experimental crack-growth data are available at this level. It is concluded that the fracture-mechanics concepts can be used to analyze fatigue behavior and to rationally evaluate the major variables that influence the fatigue life of welded beams.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 4-15
  • Monograph Title: Bridge design, construction and repair
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00043902
  • Record Type: Publication
  • Report/Paper Numbers: ISBN 0-309-02072-7
  • Files: TRIS, TRB
  • Created Date: Jun 1 1976 12:00AM