ANALYSIS OF OPEN STEEL BOX SECTIONS WITH BRACING

Braced open thin-walled steel box girders under combined bending and torsion were studied. Two model box girders were tested in the elastic range. Analytically, the top bracing of open box sections was converted to an equivalent plate thus forming an equivalent closed box. Experimental results on braced open boxes and computed stresses for the equivalent closed boxes agreed well. Rotations calculated from deflections without adjustment of support rotations were higher than the values computed for the equivalent closed boxes. Deformation of cross section was neglected in the analysis. The stresses in the bracing members were estimated using stresses in the equivalent top plate as loads on a bracing frame. The estimated stresses also compared well with experimental results. Based on the concept of equivalent closed box, a procedure was recommended for the selection of bracing member sizes.

  • Supplemental Notes:
    • Sponsored in part by Federal Highway Administration, Washington, D.C. and Pennsylvania Dept. of Transportation, Harrisburg.
  • Corporate Authors:

    Lehigh University

    Fritz Engineering Laboratory
    Bethlehem, PA  USA  18015

    Pennsylvania Department of Transportation

    Commonwealth and Forster Streets
    Harrisburg, PA  USA  17120

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • McDonald, R E
    • Chen, Y S
    • Yilmaz, C
    • Yen, B T
  • Publication Date: 1973-10

Media Info

  • Pagination: 45 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00143209
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FEL-380.7 Intrm Rpt., FHWA-RD-76-S0504
  • Files: NTIS, TRIS, USDOT, STATEDOT
  • Created Date: Oct 26 1976 12:00AM