Estimating Bridge Girder Camber and Deflection

Estimating camber is a major design issue for prestressed concrete girders. Camber is the net result of the two opposing quantities which includes the upward deflection due to the eccentricity of prestressing force and the downward deflection due to the dead load. In the current practice, it is difficult to precisely estimate camber because structural engineers cannot quantify all the factors affecting camber. The initial camber (the camber at the time of release of the prestressing strands) is highly influenced by the modulus of elasticity of the concrete and strand stress after the release of the prestressing strands. The camber at erection is additionally affected by concrete creep and shrinkage, prestress losses, and various factors associated with the difference in quality-control and storage conditions or the variation in ambient temperature or humidity. The inaccurate estimation of camber at erection can increase the frequency and cost of construction-related problems or delay the project. Additionally, inaccurate prediction of camber while the girder is in service can significantly reduce the ride quality of bridges.

    Language

    • English

    Project

    • Status: Active
    • Funding: $149926
    • Contract Numbers:

      TRC1606

    • Sponsor Organizations:

      Federal Highway Administration

      1200 New Jersey Avenue, SE
      Washington, DC  United States  20590
    • Project Managers:

      Stanley, Rick

    • Performing Organizations:

      University of Arkansas, Fayetteville

      Board of Trustees
      Fayetteville, AR  United States 
    • Principal Investigators:

      Hale, W

      Prinz, Gary S.

    • Start Date: 20160101
    • Expected Completion Date: 20171231
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01590895
    • Record Type: Research project
    • Source Agency: Arkansas State Highway and Transportation Department
    • Contract Numbers: TRC1606
    • Files: RiP, STATEDOT
    • Created Date: Feb 24 2016 4:30PM