Bond degradation induced by fatigue loading may affect the serviceability and even safety of reinforced concrete (RC) structures. To investigate fatigue bond behavior between rebar and concrete, three sets of eccentric pull-out tests were carried out, especially on specimens with a thinner concrete cover. Based on monotonic tests of nine specimens with different cover thicknesses, a bond stress-slip model was developed for specimens with splitting failure. According to the tested monotonic bond strength, repeated loadings with different amplitudes and cycles were applied to 15 specimens to fail. Failure mechanism of different fatigue bond failure modes was analyzed. Relative slip develops in three stages under repeated loading and it can be well predicted by a power function model. To investigate the effects of fatigue loading history, five specimens were subjected to a certain number cycles of repeated loading before undergoing monotonic tests. Test results show that fatigue loading history has little influence on bond strength but leads to increased bond stiffness and peak slip. An empirical unified model for splitting failure was finally proposed to describe the bond stress-slip relationship of specimens under monotonic and repeated loading.

疲劳载荷引起的粘结降解可能会影响钢筋混凝土（RC）结构的使用寿命和安全性。为了研究钢筋与混凝土之间的疲劳粘结性能，进行了三组偏心拉力测试，特别是在混凝土覆盖层较薄的试样上。基于对9个具有不同覆盖层厚度的试样的单调试验，建立了具有断裂破坏试样的粘结应力-滑移模型。根据测试的单调粘合强度，对15个样品施加不同幅度和周期的重复载荷以使其失效。分析了不同疲劳结合失效模式的失效机理。相对滑动在重复加载下分三个阶段发展，并且可以通过幂函数模型很好地预测。为了研究疲劳载荷历史的影响，在进行单调测试之前，对五个样本进行一定数量的重复加载循环。测试结果表明，疲劳载荷历史对粘结强度几乎没有影响，但会导致粘结刚度和峰滑动增加。最后提出了一个经验的破裂破坏统一模型，用来描述试样在单调和反复加载下的粘结应力-滑动关系。