Calibration of LRFD Concrete Bridge Design Specifications for Serviceability

The American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications represent an improvement in bridge design practice over past AASHTO specifications. A primary advantage of the LRFD is uniform reliability at the strength limit state, which was achieved by statistical calibration. Nevertheless, it was only possible to calibrate the service and fatigue limit states to past practice using engineering judgment and this process does not achieve uniform reliability. Although the lack of uniform reliability for these limit states affects both steel and concrete bridges, this project focuses on concrete bridges. To assure that uniform reliability is achieved for all limit states, the service and fatigue limit states need to be calibrated. The calibration shall include criteria for cracking, deformation, and concrete stresses, as well as the newly adopted fatigue provisions. Additional limit states may need to be added and calibrated to include other effects such as owner-specified design and permit vehicles, as one example. The objectives of this project are to develop new concrete service and fatigue limit states as needed, calibrate new and existing concrete service and fatigue limit states, and prepare specifications and commentary for consideration for adoption by the AASHTO Highway Subcommittee on Bridges and Structures.

Language

  • English

Project

  • Status: Completed
  • Funding: $500000.00
  • Contract Numbers:

    Project 12-83

  • Sponsor Organizations:

    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

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Dekelbab, Waseem

  • Performing Organizations:

    Modjeski & Masters, Incorporated

    P.O. Box 2345
    Harrisburg, PA  United States  17105-
  • Principal Investigators:

    Wassef, Wagdy

  • Start Date: 20090420
  • Expected Completion Date: 0
  • Actual Completion Date: 20141231
  • Source Data: RiP Project 18035

Subject/Index Terms

Filing Info

  • Accession Number: 01464471
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 12-83
  • Files: TRB, RiP, USDOT
  • Created Date: Jan 3 2013 2:43PM