FATIGUE OF CURVED STEEL BRIDGE ELEMENTS-EFFECT OF INTERNAL DIAPHRAGMS ON FATIGUE STRENGTH OF CURVED BOX GIRDERS

Research on the fatigue behavior of horizontally curved, steel bridge elements was conducted at Lehigh University under the sponsorship of the Federal Highway Administration (FHWA) of the U.S. Department of Transportation. The investigation is centered on the effect of welded details on curved girder fatigue strength. Fatigue tests of five full-scale curved plate girder assemblies and three full-scale curved box girders are part of the investigation. This report examines analytically the effects of spacing of rigid interior diaphragms on the stresses and deflections of curved box girders. Available computer programs are employed and existing results are utilized with little emphasis on the procedure of computation. The objective is to assess the qualitative relationship between stresses and the coupling influence of diaphragm spacing and curvature, so as to gain insight to the fatigue behavior of box girders. Results of the analyses indicate that decreasing of diaphragm spacing effectively controls the torsional stresses. The ratio of diaphragm spacing to radius of curved box girders is introduced as a parameter for monitoring stress ranges. It appears that the relationship between stress range and the spacing-to-radius ratio is practically linear for a given geometry of curved box girder. More study is recommended to explore further this ratio as a parameter for controlling the magnitude of stress range. (FHWA)

  • Corporate Authors:

    Lehigh University

    Fritz Engineering Laboratory
    Bethlehem, PA  USA  18015

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Daniels, J H
    • Abraham, D
    • Yen, B T
  • Publication Date: 1979-8

Media Info

  • Pagination: 57 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00325381
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-79-136 Intrm Rpt., FCP 35F2-052
  • Contract Numbers: DOT-FH-11-8198
  • Files: NTIS, TRIS, USDOT
  • Created Date: Apr 15 1981 12:00AM