中文摘要：

为研究钢-混凝土组合结构中PBL（Perfobond Leiste）抗剪连接件在疲劳荷载作用后的力学性能退化规律，设计并制作了9个PBL连接件的推出试件分别进行静力和疲劳试验．其中3个试件为静力破坏试验，重点关注了试件的破坏模式、极限承载力及荷载-滑移曲线．其余6个试件为在经历一定疲劳荷载循环次数后进行静力破坏试验，以疲劳循环次数，疲劳荷载比为参数变量，得到在不同疲劳参数作用后，PBL连接件的极限承载力、残余滑移量、抗剪刚度等力学性能的变化情况．研究结果表明，PBL连接件具有较好的延性，其静载和疲劳后静载的破坏模式均为一侧贯穿钢筋剪断、另一侧贯穿钢筋屈服．疲劳荷载比对PBL连接件剩余承载力影响较大，在同样经历了300万次的循环加载后，荷载比为0．5的极限承载力基本没有下降，而荷载比为0．7的承载力仅为初始静载试验的76．1％；在相同荷载比（0．6）情况下，PBL连接件的承载力随疲劳加载次数呈先慢后快的非线性退化趋势．相对于荷载比而言，残余滑移量对疲劳循环次数更为敏感．抗剪刚度在整个疲劳加载过程中基本保持不变．

英文摘要：

In order to study the degradation law of the mechanical properties of PBL （Perfobond Leiste） shears connectors in steel-concrete composite structure under fatigue load, nine push-out PBL connectors were designed and fabricated to perform the static and fatigue tests.Among them, three static tests focused on examining the failure mode, ultimate load-carrying capacity and load-slip curves.The remaining 6 specimens were prepared for the static failure tests after a certain number of fatigue loads. Taking the cyclic number and the fatigue load ratio as the variables, the variation of the mechanical properties of the PBL connector, such as ultimate load-carrying capacity, residual slip, and shear stiffness, were obtained. The results show that： （1） PBL connector exhibits good ductility, and failure mode of the static and fatigue test specimens is all that one side of perforated steel bar cut and the other side yielded. （2） Fatigue load ratio has a significant effect on the residual strength of PBL connector.After 300 million number of cyclic loading,the ultimate load-carrying capacity is not degraded when the load ratio is 0.5,whereas it is reduced to 76.1% of initial value when the load ratio is 0.7.In the case of the same load ratio of 0.6,the load-carrying capacity tends to be slow first and then fast with the increase of fatigue cyclic number. （3） Compared with the load ratio, the residual slip is more sensitive to the fatigue cyclic number.Meanwhile, the shear stiffness is constant in the whole loading process.