Study Of RC Beams Strengthened With CFRP On Temperature Field And Flexural Behaviors At Elevated Temperature

Carbon fiber reinforced polyme(rCFRP) is a new type of material for structural engineering. CFRP material is widely used to strengthen RC members for its merits, such as high strength, lightweight, high corrosion protection, convenient construction, little modification of physical dimension etc. It has been proved an effect method to strengthen the reinforced concrete members with CFRP in engineering in recent years. But there is not much report about the behaviors of RC structures strengthened with CFRP at elevated temperature.In this paper, the temperature field and flexural behaviors at elevated temperature of RC beams strengthened with CFRP have been studied primarily. First, there are summaries about behaviors of concrete, steel, FRPs and glue at elevated temperature. At the present time, there is much more in-depth study about behaviors of concrete and steel at elevated temperature, but less about that of FRPs and glue, and least about that of inorganic glue. Many researchers have only studied mechanical behavior of RC structures strengthened with CFRP and organic glue. Because of lack of appropriate inorganic glue, in this paper, based on the behaviors of organic glue at elevated temperature and its modified correlative parameters and ultimate parameters, a finite element method models are developed with Ansys to simulate the temperature field of RC beam strengthened with CFRP. Then, the effect of CFRP on temperature field of RC beam is studied theoretically, and the characteristic is provided. Finally, approximate calculation methods for ultimate load of RC beam strengthened with CFRP in two destroy models have been suggested.