Ductility Analysis of Concrete Beam Strengthened by Externally Bonding Carbon Fiber Reinforced Polymer

Carbon Fiber Reinforced Polymer (CFRP) possesses many good performances such as lightness in weight, high strength and high corrosion resistance. Externally bonding CFRP to the concrete structures is becoming an attractive technology. Based on the fundamental theory of flexural design calculation of concrete structure, a calculation method of cross section ductility of concrete beam strengthened by CFRP was presented, and the influencing factors on it were discussed. The results show that the quantity of CFRP and its lagged strain are the most important factors influencing the ductility. The influence of the quantity of CFRP on the ductility varies with failure types of the strengthened beam.