Study on Application of Hybrid FRP Sheet as Flexural Strengthening of Reinforced Concrete Beams

Abstract

This study aims to examine the flexural capacity of reinforced beams given hybrid Fiber Reinforced Polymer (FRP), namely Glass Fiber Reinforced Polymer (GFRP) and Carbon Fiber Reinforced Polymer (CFRP). The study was compiled as an experiment by testing the tensile strength of plain reinforcing steel 8 mm in diameter and screw reinforcement in diameter 13 mm as bending reinforcement on tensile fibers. The specimens used are reinforced concrete as standard beams (BN), beams with FRP glass and carbon reinforcement (BGC), and BGC bonded with Wrap (BGC Uwrap). The results showed an increase in Pcrack and Pyield, by 46.87% and 43.34%, respectively, in BGC test loads, as well as an increase of 44.83% and 45.73% in BGC Uwrap. The highest deflection occurs in standard beams with an average of 53.59 mm when the ultimate load reaches 29.70 kN. Whereas the variation beam for the Uwrap BGC beam is 39.61 mm when the ultimate load is 47.76 kN, and the BGC beam occurs an average deflection of 41.43 mm when the ultimate load is 46.45 kN. This phenomenon shows that applying hybrid polymer materials between glass fiber and carbon fiber can increase the strengthening and flexibility of the adventurous beam and will increase again when given Uwrap or BGC Uwrap.