This study presents experimental and analytical investigations of reinforced concrete (RC) girders removed from a bridge after 40 years of service. The girders were strengthened with externally bonded fiber-reinforced polymer (FRP) sheets and tested, with the main goal of evaluating performance of real-scale members. Comparisons between the experimental data, an analytical model, and the ACI design guidelines are presented to understand the structural performance, allow for prediction, and address potential weaknesses in the design guidelines. In particular, it appears that the FRP tensile strength reduction coefficients presently adopted may be appropriate only if the member does not present D-regions. In the case of members with disturbances or discontinuities, the interfacial shear stresses may require additional analysis and limitations.

FRP tensile strength reduction coefficients may be appropriate for members without D-regions, but may not be appropriate for members with disturbances or discontinuities.

PERFORMANCE OF DECOMMISSIONED REINFORCED CONCRETE GIRDERS STRENGTHENED WITH FIBER-REINFORCED POLYMER LAMINATES

Key Takeaway: FRP tensile strength reduction coefficients may be appropriate for members without D-regions, but may not be appropriate for members with disturbances or discontinuities.