Reinforced concrete beams strengthened with carbon fiber reinforced polymer by friction hybrid bond technique: Experimental investigation |
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| Affiliation: | 1. Institute of Battlefield Engineering, PLA University of Science and Technology, Nanjing 210007, China;2. The First Research Division, General Equipment Department of the PLA, Wuxi 214035, China;3. Jiangsu Transportation Institute, Nanjing 210014, China;1. Department of Civil Engineering, Jan Nayak Ch. Devi Lal Memorial College of Engineering, Sirsa 125 055, India;2. Department of Civil Engineering, Thapar University, Patiala 147 004, India;3. Department of Civil Engineering, Indian Institute of Technology, Roorkee, Roorkee 247 667, India;1. The Hong Kong Polytechnic University, Hong Kong Special Administrative Region;2. Marquette University, Milwaukee, WI 53201, United States;3. School of Engineering, RMIT University, Melbourne, VIC 3000, Australia;1. University of Houston, TX, United States;2. Sharif University of Technology, Tehran, Iran |
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| Abstract: | Carbon fiber reinforced polymer (CFRP) can be used to strengthen the reinforced concrete (RC) beams. But premature debonding is the main failure model in ordinary bond technique, and the strengthening effect is limited. In order to improve bonding and restricting sliding displacement, Friction Hybrid Bonded FRP Technique (FHB-FRP) is developed. Six simple-span RC specimen beams with different strengthened methods were tested in four-point bending. The experiment results indicate that FRP debonding can be effectively prevented by the FHB-FRP strengthened beam. The ultimate load-carrying capacity of the specimen strengthened by FHB-FRP technique is able to increase by a factor of 2.13 times compared with the beam strengthened with ordinary bond technique (U-jacketing technique). In addition, the cracking and yielding loads are improved more significantly by FHB-FRP technique than U-jacketing technique. Specimens strengthened with FHB-FRP technique have cracks with a more limited distribution and width. Finally, the finite element method (FEM) is conducted to simulate the behavior of the test specimens. The results obtained from the finite element method are compared with experiment. Excellent agreements have been achieved in the comparison of results. |
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| Keywords: | Fiber reinforced polymer Bonding Strengthening Concrete beam Hybrid technique |
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