冲击荷载作用下改性聚丙烯纤维高强珊瑚混凝土的动力特性  

Dynamic Mechanical Properties of Modified Polypropylene Fiber-reinforced High-strength Coral Concrete Under Impact Load

作　　者：程雨竹 马林建 王磊[3] 耿汉生 高康华 谭仪忠 CHENG Yuzhu;MA Linjian;WANG Lei;GENG Hansheng;GAO Kanghua;TAN Yizhong(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China;State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact,Army Engineering University of PLA,Nanjing 210000,China;School of Civil Engineering and Architecture Engineering,Guilin University of Technology,Guilin 541000,Guangxi,China;Unit 92656 of PLA,Sanya 572000,Hainan,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]中国人民解放军陆军工程大学爆炸冲击防灾减灾全国重点实验室,南京210000 [3]桂林理工大学土木建筑工程学院,广西桂林541000 [4]92656部队,海南三亚572000

出　　处：《材料导报》2024年第5期91-97,共7页Materials Reports

基　　金：国家优秀青年科学基金(52222110);江苏省自然科学基金(BK20211230)。

摘　　要：利用100 mm分离式霍普金森压杆装置对改性聚丙烯纤维高强珊瑚混凝土进行冲击压缩试验,分析了三种不同纤维掺量的改性聚丙烯纤维高强珊瑚混凝土试样的动态压缩强度、变形特性及吸能性能。结果表明:不同纤维掺量的改性聚丙烯纤维高强珊瑚混凝土的动态抗压强度、破碎状态、韧性指数等均具有明显的应变率效应。随着纤维掺量的增加,改性聚丙烯纤维高强珊瑚混凝土的破坏程度逐渐减轻,峰值应变增大,韧性指数逐渐增大,能量吸收也呈现上升趋势。改性聚丙烯纤维的掺入能够有效增强增韧并降低珊瑚混凝土的脆性破坏特征。The impact compression test of modified polypropylene fiber-reinforced high-strength coral concrete was performed by using a 100 mm split Hopkinson pressure bar device,and the dynamic compression strength,deformation characteristics and energy dissipation of modified polypropylene fiber-reinforced high strength coral concrete samples with different fiber dosages were analyzed.The results show that the dynamic compressive strength,fracture state and toughness index of modified polypropylene fiber-reinforced high-strength coral concrete with different fiber dosages have obvious strain rate effect.With the increase of the fiber dosage,the damage degree of modified polypropylene fiber-reinforced high-strength coral concrete gradually decreases,and the peak strain,toughness index and energy dissipation gradually increase.In conclusion,mo-dified polypropylene fiber can effectively enhance toughness and reduce brittle failure characteristics of coral concrete.

关 键 词：高强珊瑚混凝土 改性聚丙烯纤维 动态抗压强度 韧性指数 能量耗散 

分 类 号：TU528.2[建筑科学—建筑技术科学]