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通过粘贴碳纤维增强片材(carbon fiber reinforced polymer,简称CFRP)加固切口混凝土梁的三点弯曲试验,研究CFRP片材的粘结厚度、粘结长度、粘结宽度以及混凝土强度等级对CFRP片材与混凝土极限粘结力的影响。试验结果表明:随着CFRP片材粘结厚度的增加,CFRP片材与混凝土的极限粘结力相应提高;当CFRP片材粘结长度不超过其有效粘结长度时,极限粘结力随CFRP粘结长度的增加而增大;混凝土强度等级对CFRP与混凝土极限粘结力的影响较小。基于对试验结果的分析,提出了CFRP片材与混凝土极限粘结力的计算公式,计算结果与试验结果符合较好。
The three-point bending test of reinforced concrete beams strengthened with carbon fiber reinforced polymer (CFRP) was carried out to study the effects of the bonding thickness, bonding length, bonding width and concrete strength of CFRP sheets on the properties of CFRP sheets Effect of concrete ultimate bond strength. The experimental results show that the ultimate bond strength between CFRP sheet and concrete increases with the increase of the bond thickness of CFRP sheet. When the bonding length of CFRP sheet does not exceed its effective bond length, the ultimate bond strength increases with the increase of CFRP The bond length increases and increases; the concrete strength grade has little effect on the ultimate bond strength of CFRP and concrete. Based on the analysis of test results, the formula for calculating the ultimate bond strength between CFRP sheet and concrete is proposed. The calculation results are in good agreement with the experimental results.