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Methods for strengthening reinforced concrete bridge girders containing poorly detailed flexural steel using near-surface mounted metallics.

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  • Creators:
  • Corporate Creators:
    Oregon State University. School of Civil and Construction Engineering
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-OR-RD-16-02
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Oregon
  • Corporate Publisher:
    Oregon. Dept. of Transportation. Research Section
  • Abstract:
    Many older reinforced concrete deck girder (RCDG) bridges contain straight-bar terminations of flexural reinforcement in

    flexural tension zones without special detailing. Common bridge design practice of the 1950s did not consider the additional

    demands on the terminated bars from shear and flexure. Moreover, application of modern design code provisions and use of

    heavier trucks contribute to insufficient bridge load ratings when evaluating flexural anchorages in existing RCDG bridges.

    Replacement of bridges with poor ratings due to localized deficiencies is not economically feasible and thus strengthening

    methods are necessary.

    The goal of this research was to investigate methods for strengthening deficient flexural steel anchorages using

    supplemental surface bonded metallic reinforcing bars. Full-scale reinforced concrete girder specimens with typical vintage

    details and materials were used as test specimens. The specimens were constructed with flexural anchorage deficiencies by

    terminating some of the embedded flexural bars past a 45° preformed diagonal crack. The terminated bars had only one-third of the code-prescribed development length past the diagonal crack.

    A strengthening technique called near-surface mounting (NSM) was applied to the specimens. Two metallic materials were

    selected for the NSM reinforcement: titanium and stainless steel. These materials were chosen because of their high

    strength, ductility, environmental durability, and ability to form mechanical hooks at the ends of the bars. This study found

    that the NSM strengthening technique with metallic materials increased the deformation and load capacity of all

    specimens. In addition, a case study was performed to demonstrate the flexural strengthening for the Mosier Bridge

    overcrossing of I84 in Oregon. The case study demonstrated that the techniques and materials applied to the girder were

    able to achieve the required strength and provided good deformation capacity.

  • Format:
    PDF
  • Funding:
    SPR 750
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:9bc38bf34c5b87d08a8753172f43b2ff7d9f43b6c05733ff36d8e843e78f49128b47ed82faf9314bbccbb686a02e705c91b92acd331160f7ea751873c9e7d552
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    Filetype[PDF - 8.25 MB ]
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