FRP筋混凝土界面疲劳黏结性能试验研究

Experimental Study on Fatigue Bonding Performance of Interface between FRP Tendons and Concrete

针对FRP(Fiber Reinforced Polymer/Plastics)筋混凝土界面黏结性能的疲劳寿命问题,开展了CFRP(Carbon Fiber Reinforced Polymer/Plastics)筋材与活性粉末混凝土RPC(Reactive Power Concrete)之间的疲劳黏结性能试验研究。试验详细研究了锚固长度、循环次数、应力水平以及应力幅值等参数对疲劳锚固性能的影响。结果表明,在疲劳荷载的作用下,组装件之间的黏结性能将随循环荷载次数的增加更加趋于稳定;在相同荷载等级下,锚固长度越大,CFRP筋相对于RPC的滑移量越小;在相同荷载等级下,应力幅值越大,CFRP筋相对于RPC的滑移量越大;200万次循环荷载后的CFRP筋抗拉刚度总体上略微降低,但对CFRP筋使用性能影响很小;疲劳后组装件极限承载力有所提高,疲劳荷载使CFRP筋与RPC的黏结处于更加稳定状态。总之,CFRP筋在超高性能混凝土RPC中具有极其优良的疲劳黏结锚固性能。

Due to the issue of fatigue life prediction of interface between fiber reinforced polymer/plastics（FRP） tendons and concrete,the fatigue bond performance of carbon fiber reinforced polymer/plastics（CFRP） tendons and reactive power concrete（RPC） is studied experimentally.The effects of the experimental parameters,such as anchorage length,cycle numbers,stress level,and stress amplitude on the fatigue anchorage performance are researched detailedly in the test.The result shows that the bond performance of the assembly parts under fatigue load tends more stability as the cycle numbers increasing;（2） under the same load grade,the slip of CFRP tendon to RPC decreases as the bond length increasing,while the slip of CFRP tendon to RPC increases as the stress amplitude increasing;（3） the tensile stiffness of CFRP tendons is slightly lower after 2 000 000 cycles,but it is very small for the effect of the use of CFRP tendons;（4）the ultimate load bearing capacity of the assembly parts can be improved slightly after fatigue,and the fatigue load can make the better bond property of interface between CFRP tendons and RPC.In general,the bond interface between CFRP tendons and RPC has extremely good fatigue bond anchorage performance.