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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。
Aiming at the fatigue life of FRP (Fiber Reinforced Polymer / Plastics) interface, the fatigue properties between CFRP (Reinforced Polymer Polymer) and RPC (Reactive Power Concrete) were studied. . The effects of anchoring length, number of cycles, stress level and stress amplitude on fatigue anchorage performance were studied in detail. The results show that under the action of fatigue load, the bonding performance of the assembly tends to be more stable with the increase of cyclic load. Under the same load level, the greater the anchorage length, the more the CFRP tendons slip relative to RPC Small; at the same load level, the greater the stress amplitude, the larger the CFRP tendons slip relative to RPC; the tensile stiffness of CFRP tendons decreased slightly after 2000000 cycles, but the impact on the performance of CFRP tendons And the ultimate bearing capacity of the assembly increased after fatigue. The fatigue load made the bonding between CFRP bars and RPC more stable. In short, CFRP tendons have extremely excellent fatigue bond anchoring performance in ultra high performance concrete RPC.