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对采用碳纤维布加固的钢筋混凝土梁的弯曲性能进行研究。考察了配筋率ρ对加固梁弯曲强度的影响。对12个混凝土梁试件(截面尺寸为宽150mm,高200mm,长2000mm)进行了试验。梁截面具有三种不同的纵向钢筋配筋率,9个试件在受弯区域采用碳纤维布加固,另外3个试件作为对比试件。不同试件中,碳纤维布的宽度、长度和层数是变化的。与对比试件相比,加固梁的弯曲强度和刚度增加了。从研究结果可得出,与最大配筋率的梁相比,ACI440·2R-02的设计指南和加拿大的I-SIS高估了碳纤维布在小配筋率梁的弯曲强度方面的增加作用。随着梁的配筋率ρ的增长,试验荷载与按照ACI440·2R-02指南和加拿大ISIS计算荷载的比值是增长的。因此,由两个设计指南提出的方程更适合于高配筋率的梁,接近最大配筋率ρmax的梁试件的破坏具有足够的延性。
The flexural behavior of RC beams strengthened with CFRP was studied. The effect of reinforcement ratio ρ on the bending strength of reinforced beam was investigated. Twelve specimens of concrete beams (150 mm wide, 200 mm high and 2000 mm long) were tested. Three different longitudinal reinforcement ratios were used for the beam section, nine specimens were reinforced with CFRP in the flexural area, and the other three specimens were used as the comparative specimens. In different specimens, the width, length and number of carbon fiber cloths vary. The bending strength and stiffness of the reinforcing beam are increased compared to the comparative specimen. From the results of the study, it can be concluded that the design guidelines for ACI440.2R-02 and I-SIS in Canada overestimate the increase in the flexural strength of CFRP beams in comparison with beams with maximum reinforcement ratios. As the beam reinforcement rate ρ increases, the ratio of the test load to the calculated load according to the ACI 440 · 2R-02 Guidelines and the Canadian ISIS increases. Therefore, the equations proposed by the two design guidelines are more suitable for beams with high reinforcement ratio, and the failure of beam specimens close to the maximum reinforcement ratio ρmax has sufficient ductility.