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通过自行设计的加载装置,采用双面剪切试验法研究了粘结长度对碳纤维增强复合材料(CFRP)-C60高强混凝土界面性能的影响,并提出了最小粘结长度的概念和有效粘结长度模型.结果表明:随粘结长度的增大,试件破坏时的极限荷载和极限位移均显著增加,但初始剥离荷载和初始剥离位移都没有明显的变化;随着荷载的增加,应力的传递区域不断向前推进,同时应力传递区域的长度也不断增加,即应力传递区域呈现动态变化;C60混凝土的最小粘结长度大约为有效粘结长度的2倍,只有当粘结长度大于最小粘结长度时才可充分发挥粘结界面的承载力,提高界面延性.
The influence of bond length on the interfacial properties of CFRP-C60 high-strength concrete was studied by means of a double-sided shear test with a self-designed loading device. The concept of minimum bond length and effective bond length Model.The results show that the ultimate load and the ultimate displacement of specimens are significantly increased with the increase of the bond length, but the initial peel load and the initial peel displacement have no obvious changes. With the increase of load, the stress transfer The region continues to move forward, at the same time, the length of the stress transfer area also increases continuously, that is, the stress transfer area presents a dynamic change. The minimum bonding length of C60 concrete is about twice of the effective bonding length. Only when the bonding length is greater than the minimum bonding Length can give full play to the bearing capacity of the interface, improve interface ductility.