AFRP约束混凝土多次冲击试验研究

为研究芳纶纤维增强层复合材料（AFRP）约束条件下混凝土抗多次冲击的动态力学性能，采用Ф100 mmSHPB试验装置和超声无损检测，在相似应变率条件下，对C30，C40，C50三种基体强度等级的1~3层AFRP约束混凝土抗多次冲击动态力学性能和冲击后混凝土试件内部损伤规律进行试验研究。结果表明：各约束层数AFRP约束混凝土动态峰值应力对冲击次数不敏感，上下浮动不超过8%，稳定性良好；随着冲击次数的增加，动态峰值应变增大，内部混凝土损伤增大，损伤因子与冲击次数呈线性关系；AFRP约束混凝土内部损伤在达到普通混凝土极限损伤后仍能保持试件完整，具备对抗下次冲击的能力。

Experimental research of AFRP confined concrete under repeated impact

To study the dynamic mechanical properties of Aramid Fiber-Reinforced Plastic (AFRP) confined concrete under the impact of repeated dynamic load, using Ф100mm Split Hopkinson pressure bar (SHPB), the dynamic mechanical properties of three kind strength of concrete (C30, C40 and C50) with 1~3 layers AFRP confined was tested in a similar strain rate condition. Through an ultrasonic non-destructive test, damage law of concrete specimens was studied after every impact. The results show that the dynamic peak stress of 1~3 layers AFRP confined concrete is insensitive to the impact cycles, it fluctuating less than 8% shows that AFRP confined concrete is steady; the dynamic peak strain and the damage to inner concrete are increasing with the increased impact frequency, and the damage factor is linear to the impact cycles; AFRP confined concrete remains the shape as a whole test piece when the damage on inner concrete reaches the utmost limit value of common concrete under the same situation. Further more, the AFRP confined concrete test piece remains the ability to withstand next impact.