Improved Design Specifications for Horizontally Curved Steel Girder Highway Bridges

This research developed recommended guide specifications for horizontally curved highway bridges based on current practice and technology. The proposed specifications that resulted from this work were adopted by AASHTO in 1999. The first AASHTO Guide Specifications for Horizontally Curved Highway Bridges, issued in 1980, was based on research performed in the early 1970s. The 1980 Guide Specifications included design provisions for curved steel I-girder and composite box-girder bridges. Design and construction experience since then has demonstrated some major deficiencies of the Guide Specifications that can result in overly conservative designs. Fabrication and erection provisions were also missing, and there was insufficient guidance on analytical procedures for both preliminary and final design. The findings of this study are documented in NCHRP Report 424, "Improved Design Specifications for Horizontally Curved Steel Girder Highway Bridges." The report provides a full description of the research that was performed to develop the improved specifications. The report is particularly noteworthy because it identifies major departures from the current specifications and because it explains the reasoning behind these departures. The report should prove to be a valuable resource document for design engineers who are interested in understanding the theoretical and historical basis of the specification provisions.


  • English


  • Status: Completed
  • Funding: $378103
  • Contract Numbers:

    Project 12-38

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001
  • Performing Organizations:

    Auburn University

  • Principal Investigators:

    Hall, Dann

    Yoo, C

  • Start Date: 19930101
  • Expected Completion Date: 19990630
  • Actual Completion Date: 19990630

Subject/Index Terms

Filing Info

  • Accession Number: 01685025
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 12-38
  • Files: TRB, RiP
  • Created Date: Nov 5 2018 3:02PM