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基于16个不同保护层厚度及箍筋间距的梁端式试件,研究保护层厚度及箍筋的耦合作用对极限黏结强度的影响。试验结果表明:增大保护层厚度可以显著提高极限黏结强度;配置箍筋可以增大极限黏结强度,但是增大幅度较小;当保护层厚度较大时,箍筋对极限黏结强度的贡献作用减小。从混凝土保护层以及箍筋两种约束出发,提出了混凝土保护层增强系数、箍筋增强系数的概念,并提出可综合考虑混凝土保护层厚度与强度、箍筋数量及锚固黏结长度影响效应的极限黏结强度的计算式。
Based on 16 beam end specimens with different thickness of protective layer and stirrup spacing, the influence of the thickness of protective layer and the coupling effect of stirrups on the ultimate bond strength was studied. The experimental results show that increasing the thickness of the protective layer can significantly increase the ultimate bond strength. The stirrups can increase the ultimate bond strength but increase less. When the thickness of the protective layer is large, the contribution of the stirrups to the ultimate bond strength Decrease Based on the two kinds of restraints of concrete cover and stirrups, the conceptions of the coefficient of reinforcement of concrete cover and the coefficient of reinforcement of stirrup are put forward, and the limit that can be considered synthetically is the thickness and strength of concrete cover, the number of stirrups and the effect of anchorage length Bond strength of the formula.