Behavior of Repaired Sampson County Bridge Beams after 2 Years in Service

Sampson County Bridge No. 810003 is a three-span prestressed channel structure built in 1966 on Service Route No. 1933 across Branch Six Run Creek. Six channel beams (12 stems) were retrofit in November of 2020 using a prestressed mechanically fastened fiber reinforced polymer (MF-FRP) system. The retrofit was designed to restore prestressing forces lost due to corrosion of internal steel strands. The retrofit was intended as a temporary measure to keep the bridge open without lowered load postings while a bridge replacement could be designed, bid, and scheduled. Bridge 810003 is scheduled for demolition and replacement in late 2022 or early 2023. The proposed research aims to salvage the six retrofitted channel beams from Bridge 810003 that have been in-service for more than 21 months. In addition, the work proposes to salvage two additional control beams from the bridge that have not been retrofitted. Beams will be identified prior to bridge demolition, removed from the bridge during demolition with the MF-FRP repair systems intact, trucked to Constructed Facilities Laboratory (CFL) in Raleigh, and tested to failure in the laboratory. Samples of the FRP material will be recovered from the tested beams and for material-scale tension testing. Concrete cores will be taken from the beams to determine the concrete compressive strength. The proposed experiments will capture the full response to failure of the retrofit beams, allowing for comparison to analytical predictions and evaluation of the effectiveness and durability of the retrofit. Predications of beam behavior will use the procedures developed as part of previous research project RP2018-16. As justified by the research results, edits to the existing design methods, installation procedures, inspection procedures, ratings spreadsheet, and standard details and specifications will be developed and proposed. This proposed research project presents a unique opportunity to evaluate the performance of in-service girders that cannot be replicated on new concrete girders.


  • English


  • Status: Active
  • Funding: $123457
  • Contract Numbers:


  • Sponsor Organizations:

    North Carolina Department of Transportation

    Research and Development
    1549 Mail Service Center
    Raleigh, NC  United States  27699-1549
  • Managing Organizations:

    North Carolina Department of Transportation

    Research and Development
    1549 Mail Service Center
    Raleigh, NC  United States  27699-1549
  • Project Managers:

    Kadibhai, Mustansir

  • Performing Organizations:

    North Carolina State University, Raleigh

    Department of Civil Engineering, Campus Box 7908
    Raleigh, NC  United States  27695-7908
  • Principal Investigators:

    Lucier, Gregory

  • Start Date: 20230801
  • Expected Completion Date: 20240731
  • Actual Completion Date: 0
  • USDOT Program: Structures
  • Subprogram: Bridge Safety

Subject/Index Terms

Filing Info

  • Accession Number: 01895573
  • Record Type: Research project
  • Source Agency: North Carolina Department of Transportation
  • Contract Numbers: RP2024-15
  • Files: RIP, STATEDOT
  • Created Date: Oct 6 2023 3:03PM