DIAPHRAGM SPACING REQUIREMENTS FOR CURVED STEEL BOX BEAM BRIDGES

The purpose of this report is to formulate a design procedure by which cross-sectional deformations in single span curved box bridge girders can be readily evaluated. Design equations have, therefore, been developed to predict the magnitude of induced distortional stresses due to dead and live loads that can be anticipated in a curved box girder, providing the girder's section properties, length, radius of curvature, diaphragm spacing, and loading condition are known. A computer program was written to solve the governing differential equation for cross-sectional deformations, as presented by Dabrowski, using the finite difference numerical technique. The accruacy of the resulting solutions to the differential equation was checked by making a comparison to closed-formed results obtained by Dabrowski. Further, the validity of the theory was checked by comparing the numerical results to experimental data obtained from tests conducted at Carnegie-Mellon University. Using then the developed computer program, the distortional response of 99 box sections, subjected to dead and live loads, was evaluated and empirical equations developed to predict the observed behavior. The sections under consideration had varying section properties, span lengths, curvatures, diaphragm spacings, and load configurations in order to evaluate the effect of these parameters on the sections' distortional response. The resulting data from the study was then examined and design equations formulated, as mentioned previously. Finally, a design example is given in detail in order to illustrate the use of the design equations developed. /FHWA/

  • Supplemental Notes:
    • This report was sponsored by Maryland Department of Transportation and FHWA/DOT.
  • Corporate Authors:

    University of Maryland, College Park

    Department of Civil and Environmental Engineering
    College Park, MD  United States  20742
  • Authors:
    • Oleinik, J C
    • Heins Jr, C P
  • Publication Date: 1974-8

Media Info

  • Pagination: 140 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00132998
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-MD-R-76-4 Intrm Rpt.
  • Contract Numbers: AW-75-133-46
  • Files: TRIS, USDOT
  • Created Date: Jun 5 1976 12:00AM