Experimental and Analytical Study on Postfire Reinforced Concrete Beams Retrofitted with CFRP in Flexure and Shear

In this study, experiments were performed on carbon fiber reinforced polymer (CFRP) retrofitted postfire concrete (RC) beams, followed by theoretical analyzes. Experiments conducted eleven RC which exposed to different fire durations and with CFRP in flexure shear. The experimental results indicated that shifted the failure flexure-shear of beams. beams experienced progressive peeling-off failure. FRP retrofitting significantly increased yield deflection 58.2−97.3% but decreased ultimate 43.0−55.5% compared control beam. Consequently, ductility was reduced 69.7−74.7%, categorized as low ductility. successfully strengths 30-min up 23.1% higher than those Fire stiffness 46.4−49.2% beam, whereas did not fully recover Finally, a simple model moment capacity without/with retrofits developed based practicability limited data feasibly obtained from real fires. proposed model, its simplicity, practicability, reasonable accuracy, can be useful tool for structural engineers structures. Doi: 10.28991/CEJ-2023-09-07-05 Full Text: PDF