Strengthening with carbon fiber reinforced polymer and glass fiber reinforced polymer of insufficient bending rigidity simple rectangular beams

Abstract

The reinforcement of rectangular sectioned and simple supported beams, with carbon and glass fibers against the bending strength was examined in this study. Reinforcement of the reinforced concrete beams with Carbon Fiber Reinforced Polymer (CFRP) and Glass Fiber Reinforced Polymer (GFRP) were applied with the wrapping method on the entire tensile zone, and a bit enfolded on the side surface. Beams, with the dimensions of 160 × 200 × 2200 mm, made up of C20(Concrete20) concrete and S420(Steel420) steel were used for this application. Moreover, crack behaviors in bending and shearing zones of the beams were examined. The displacement values of the beams were measured as 43.8, 22.8 and 32 mm for control, CFRP, and GFRP beams, respectively. Cracks occurred at the endpoint of the material that is adhered as two layers; in other words, they were seen 380 mm away from end of the beam. As result of all these findings, it can be stated that the reinforcement was successful; the beams could be reinforced with glass and carbon fibers; and glass fibers could be preferred economically.   Key words: Reinforcement, reinforced concrete beams, carbon fiber reinforced polymer, glass fiber reinforced polymer.