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Based on the hypothesis of neglecting tensile strength of concrete when concrete beam is bended, the simple bending concrete cover of four-point bending concrete beam is cut, thus forming a “π-shaped” notch on the side elevation of the beam. Such beam is called a wide notch concrete beam, which is a new abnormal concrete beam used to study the characteristics of the CRFP (Carbon fiber reinforced plastic plate )plate-concrete interface. With consideration of some theoretical hypotheses, computational analysis, and static load test of 4 common concrete beams with externally bonded reinforcement of CFRP plate (EBR CFRP), 4 concrete beams with wide notch and 3 simple concrete beams (control group), this study investigated the calculation formula for the bending moment-curvature of concrete beam with EBR CFRP and wide notch under different loading phases. The theoretical values of cracking load, yield load, ultimate load and corresponding curvature of the reinforced concrete beam were then calculated. These theoretical values agree well with the test results.

Research on the bending moment-curvature relationship of wide notch concrete beam strengthened with EBR CFRP plate