Reinforced Concrete T Beam Around The Junction U-shaped Cfrp Shear Reinforcement, The Original Beam Conditions Impact Study

Fiber reinforced polymers/plastics (FRP) have been widely used in structure reinforcement for their well-known advantages, including their light weight, high strength, good corrosion resistance and simplicity in use. In this paper, we developed a new method of shear strengthening with CFRP to avoid debonding at the end of CFRP sheets. Through the tests of 13 RC T-beams simulating the shear strengthening of continuous beams under negative moment. The main works and achievements are as follows:1. The results showed that anchor by wrapping CFRP around bars can effectively develop the ultimate shear capacity and improve the mechanical performance of the reinforced structures.2. Through this experiment, some factors to influence the failure modes and shear properties of the strengthening beams were studied, including,span ratio, concrete strength and preload level. Then, the failure mechanism and mechanical model of the strengthening beams were analyzed.3. Finally, all the factors, such as, span ratio, concrete strength, preload level and crack angle were integrated, and then the formula for estimating the ultimate shear capacity and CFRP effective strain were put forward. Compared with test results available, the proposed equations gave good agreement.