AFRP约束混凝土多次冲击试验研究  

Experimental research on AFRP confined concrete under repeated impact

作　　者：梁磊[1] 顾强康[1] 原璐 

机构地区：[1]空军工程大学工程学院 [2]94285部队

出　　处：《振动与冲击》2013年第5期90-95,共6页Journal of Vibration and Shock

基　　金：军队科研项目(KHZ041706)

摘　　要：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Φ100mmSHPB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。To study the dynamic mechanical properties of Aramid Fiber-reinforced Plastic （AFRP） confined concrete under the impact of repeated dynamic load, using qblOOmm split hopkinson pressure bar （SHPB）, the dynamic mechanical properties of three kinds of concrete with different strength, （ C30, C40 and C50） , confined with 1 -3 layers AFRP, were tested under a similar strain rate condition. Through an ultrasonic non-destructive test, the internal damage of concrete specimens was inspected after each impact. The results show that the dynamic peak stress of 1 -3 layers AFRP confined concrete is insensitive to the number of impact cycles. Its fluctuation is less than 8% and it is shown that AFRP confined concrete is steady; the dynamic peak strain and the damage of inner concrete are increasing with the increase of impact frequency, and the damage factor is in linear relation with the number of impact cycles; AFRP confined concrete keeps the shape as a whole test piece when the damage of inner concrete reaches the utmost limit of common concrete under the same situation. Furthermore, the AFRP confined concrete test piece retains the ability to withstand next impact.

关 键 词：芳纶纤维 SHPB试验 多次冲击 动态力学性能 超声无损检测 损伤 

分 类 号：TU377.4[建筑科学—结构工程]