To study the effect of steel corrosion on the shear resistance of new shear connectors, push-out tests were carried out on three groups of six discontinuous perfobond rib shear connectors with different corrosion ratios. After testing, the displacement, strain distribution, crack development and relative slip between concrete and steel were assessed. Based on the experimental work, the effects of corrosion of perfobond ribs and transverse rebars on the shear resistance of the connectors were studied using finite-element models. The results showed that when the corrosion ratio was low, the corrosion of the perfobond rib increased the cohesion between the steel and the concrete, thereby improving the initial stiffness and ultimate bearing capacity (UBC) of the structure. With an increase in the corrosion ratio, expansion cracks on the joint surface led to bonding failure between the steel and concrete and the shear resistance of the structure was greatly reduced. When the corrosion ratio of the transverse rebars was 10%, the UBC of the connection decreased by only 5% and the initial stiffness hardly changed.

中文翻译：

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腐蚀对不连续 perfobond 肋剪切连接件剪切行为的影响

为研究钢材腐蚀对新型剪力连接件抗剪性能的影响，对三组六个不同腐蚀比的不连续穿孔肋剪力连接件进行了顶出试验。测试后，评估了混凝土和钢之间的位移、应变分布、裂缝发展和相对滑移。在实验工作的基础上，利用有限元模型研究了穿孔钢筋和横向钢筋腐蚀对连接件抗剪强度的影响。结果表明，当腐蚀率较低时，穿孔钢筋的腐蚀增加了钢筋与混凝土的结合力，从而提高了结构的初始刚度和极限承载力（UBC）。随着腐蚀率的增加，结合面的膨胀裂缝导致钢筋与混凝土的粘结失效，结构的抗剪强度大大降低。当横向钢筋的腐蚀率为10%时，连接的UBC仅降低了5%，初始刚度几乎没有变化。