Flexural strengthening of RC beams with NSM-GFRP technique incorporating innovative anchoring system

Reinforced concrete (RC) beams may require flexural strengthening due to the corrosion of reinforcing bars or changes in design load. The near surface mounted (NSM) and externally bonded (EB) techniques, using either glass carbon fibre-reinforced polymer (GFRP CFRP) composites, are used for deficient RC beams. However, strengthened with both techniques susceptible debonding failure FRP composites. This paper proposes an innovative anchoring system NSM beams, which comprises L-shaped GFRP bar anchor (L-anchor), U-shaped CFRP strips (U-strips) double plate (DP-anchor). developed technique is termed as NLUD technique. Seven were cast tested under four-point bending. experimental results showed that achieved significantly higher prevented