碳纤维拉索及其锚固系统抗冲击性能试验研究

为研究碳纤维（Carbon Fiber Reinforced Polymer/Plastic, 简称CFRP）拉索及其锚固系统在冲击荷载作用下的动力性能,采用落锤冲击试验机,对直径9.8mm的表面压纹CFRP筋及粘结式锚具组装件的横向抗冲击性能进行了试验研究。实测了不同冲击能量下锤头冲击力及筋材的索力时程曲线和破坏形态,根据实测结果计算了冲击荷载-位移曲线与试件吸能-位移曲线。结果表明：CFRP拉索锚具组装件的破坏形态包括筋材的滑移、基体的层裂和纤维的剪断,相应的横向抗冲击承载力分别为12.26kN、20.77kN和17.4kN;试件承受多次冲击时,耗能能力逐次降低;CFRP筋与RPC在动力作用下的粘结机理有别于静力作用,值得进一步研究。

Experimental study on impact behaviors of CFRP cable and its anchoring system

The dynamic behaviors of CFRP (Carbon Fiber Reinforced Polymer/Plastic) cable and its anchoring system under transverse impact load were investigated by testing the embossing CFRP specimens with the diameter of 9.8mm and the anchorage assembly grouted by the RPC (Reactive Powder Concrete) using the drop hammer impact tester. Under different impact energy, the impact force of hammer head, time-history curve of cable force and failure pattern of reinforced material were tested, and then the impact force-displacement curves and the energy absorption-displacement curves were calculated based on the measured results. The results show that the typical failure patterns of CFRP cable and anchorage assembly include the slippage of reinforced material, delamination of matrix material and breakage of fibers, and their corresponding transverse impact resistance were 12.26kN, 20.77kN and 17.4kN, respectively. When subjected to multiple impacts, the energy dissipation capacity of specimens may decrease gradually. The bonding mechanism of CFRP tendon and RPC under dynamic loading differs from that under static action, which definitely deserves further investigations.