Advanced bridge safety initiative : live load testing and load rating of the Evans Brook Bridge (#5506) and the Hastings Bridge (#5507) in Batchelders Grant, Maine.
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Advanced bridge safety initiative : live load testing and load rating of the Evans Brook Bridge (#5506) and the Hastings Bridge (#5507) in Batchelders Grant, Maine.

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    • Creators:
    • Corporate Creators:
      University of Maine. Advanced Structures and Composites Center
    • Subject/TRT Terms:
    • Publication/ Report Number:
      ME 14-11
    • Resource Type:
      Tech Report
    • Geographical Coverage:
      Maine
    • Corporate Publisher:
      Maine. Dept. of Transportation
    • Abstract:
      The Advanced Structures and Composites Center at the University of Maine (UMaine) performed live load testing

      and rating factor analysis for two bridges (No. 5506 and No. 5507) in Batchelders Grant, Maine. The bridge load

      rating performed by consultants to the Maine Department of Transportation (DOT) indicated that the girders are not

      sufficient for carrying the legal loads for these bridges. Each bridge is built with four rolled steel girders (W36x170)

      with a variable depth concrete deck. Live load testing was conducted on October 17 and 18, 2013 in collaboration

      with Maine DOT personnel to evaluate the performance of the girder with potential gains expected due to

      unintended composite action.

      The strain measurements were consistent, and the results appear reliable. Measured strains clearly indicated partial

      composite action between the girder and slab for Bridge No. 5506 and full composite action for Bridge No. 5507.

      Given that partial composite action was observed in Bridge No. 5506 and the flange is not partially embedded, the

      interior girder HL-93 operating rating factor for flexure can only be increased from 0.56 to 0.88 based on measured

      strains. However, the interior girder moment rating factor for Bridge No. 5507 can be increased to 0.92 based on

      analysis alone if the MaineDOT agrees that the girder will be able to develop its noncomposite plastic moment

      capacity given its partial embedment in the slab. The measured strains indicate that other sources of structural

      stiffness and capacity may justify a further increase in HL-93 operating rating factor to 1.18 for interior girder

      flexure in Bridge No. 5507.

    • Format:
      PDF
    • Funding:
      20100506*5729
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