通过对8根矩形截面钢筋混凝土梁的静力加载试验,研究了抗弯和抗剪两种加固方式对钢筋混凝土梁的破坏形态和力学性能的影响,对比分析了碳纤维加固率、试验梁的状态、混凝土强度对加固效果的影响。结果表明:经碳纤维抗弯和抗剪加固后加固梁相应的力学性能指标值明显提高;混凝土裂缝扩展得到了有效延缓,加固效果明显;抗弯加固后可显著提高混凝土梁的承载力和延性,但提高程度并不与加固率成正比;预裂梁抗弯加固后承载力和延性得到提高,但与其相同加固参数的梁相比,其承载力和延性有所降低;抗剪加固时混凝土强度越高,加固后混凝土梁的承载力和变形能力提高幅度越大,其中混凝土梁的变形能力受混凝土强度的影响较大。最后,对加固梁的极限承载力进行了理论分析与计算,建立了实用的理论计算公式,计算结果与试验结果吻合较好。 Through the static loading test of eight rectangular RC beams, the effect of two kinds of reinforcement methods, including bending and shearing, on the failure morphology and mechanical properties of RC beams is studied. The effects of carbon fiber reinforcement ratio, test beam state , The impact of concrete strength on the reinforcement effect. The results show that the corresponding mechanical property index of reinforced concrete beams strengthened by carbon fiber bending and shear strengthening is obviously increased; the crack propagation of concrete is effectively delayed and the reinforcement effect is obvious; the bearing capacity and ductility of concrete beam can be significantly increased after bending reinforcement, But the degree of improvement is not proportional to the reinforcement rate. The bearing capacity and ductility of pre-splitting beam after bending reinforcement is improved, but the bearing capacity and ductility of the pre-splitting beam is lower than that of the same strengthening beam. The shear strength of concrete is higher , The greater the increase of the bearing capacity and the deformation capacity of the reinforced concrete beam, the deformation capacity of the concrete beam is greatly affected by the strength of the concrete. Finally, the ultimate bearing capacity of the reinforced beam is theoretically analyzed and calculated, and a practical theoretical calculation formula is established. The calculated results are in good agreement with the experimental results.