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In recent years, The reinforced concrete beams strengthened by external bonded FRP has been widely used because of its light weight, corrosion resistance, easy construction, high strength advantages. The traditional method is to use structural adhesive to attach the FRP and the structure to improve the bearing capacity. However, this method is prone to FRP stripping, resulting in low utilization of FRP,and the layer of FRP is considerably limited, so the reinforcement is not ideal. To a great degree, concrete surface preparation can effect the bond strength between FRP and concrete, in order to make FRP reinforcement better, some experts proposed new reinforcement methods, such as anchorage, mechanical Anchorage, Surface embedded; the new Surface Preparation, such as wheel grinding, mechanical sand blasting, high pressure water gun injection, artificial chiseling method.HB-FRP method can obviously improve the bearing capacity.However, the negative effect of this method has not been demonstrated. In this paper, a total of 5 groups specimens are prepared.Through two variable of Span of beam and ratio of reinforcement, we did investigate about the effect of the artificial chiseling to the RC Beams bearing capacity which Strengthened by FRP Sheet; Through the experiment and theoretical analysis to explain the cause of the negative impact; we invent STEEL-FRP method to RC Beams,and through the experiment and theoretical analysis to find advantage of this method,and the results show that:The ultimate moment of a FRP-strenghened beam with artificial chiseling is lower than that of a FRP-strenghened beam with wheel grinding. Besides, as the beam’s span increases, the difference value increases between the ultimate moment of a beam with artificial chiseling and that of a beam with wheel grinding; and the difference value decrease as the the reinforcement ratio increase.
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