| A new RC strengthening method with CMMR(composite mortar laminate reinforced with mesh reinforcement) has a lot of advantages.The experimental study on the shear performance of overhanging reinforced concrete beams was carried on in this paper. The main contents are as follows:1. Based on the comparison with common strengthening methods of RC structure, the advantage of strengthening method with CMMR is discoursed.2.The shear performance of five overhanging reinforced concrete beams strengthened with CMMR was experimented, the deflection,strain and load capacity was tested, the experimental phenomenon was observed. The effects of shear-span ratio, moment ratio, web reinforcement ratio of CMMR, style of loading, preloading on strengthening is discussed, and compared with RC beams using ordinary stirrup.3. The shear mechanism of the RC beams is discussed in the paper. It is assumed that the shear mechanism of CMMR is consistent with the stirrup, so the contribution of CMMR can be investigated by experiments. And the truss-arch model is introduced to Analyze the strengthening mechanism of CMMR to overhanging reinforced concrete beams.4. According to the test results, the computational formula of the shear load capacity of overhanging reinforced concrete beams strengthened with CMMR is established. And the theoretical results agree with the experiment results basically.5. The construction quality is very important to effect of strengthening, the cource of construction and the technical requirements are presented at last.
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