纤维混凝土动态压缩力学性能的SHPB试验研究  

Dynamic compressive testing and mechanical behavior of fiber reinforced concrete using a split Hopkinson Pressure Bar

作　　者：翟毅[1] 许金余[1,2] 王鹏辉[3] 

机构地区：[1]空军工程大学工程学院机场建筑工程系,陕西西安710038 [2]西北工业大学力学与土木建筑学院,陕西西安710072 [3]空军第一建筑安装工程总队,北京100089

出　　处：《西安建筑科技大学学报（自然科学版）》2009年第1期141-148,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10372084)

摘　　要：采用Φ100mm分离式霍普金森压杆(SHPB)试验装置,研究了四个不同纤维体积掺量的碳纤维混凝土(CFRC)、玄武岩纤维混凝土(BFRC)在多个应变率条件下的动态压缩力学性能,并对两种纤维混凝土的冲击力学性能进行了对比分析.结果表明,CFRC和BFRC的强度随应变率的增加而近似呈线性增长,强度增强因子随应变率的增加呈对数增长,表现出明显的应变率相关性;纤维体积掺量0.1%的玄武岩纤维混凝土的强度最高,纤维体积掺量0.3%碳纤维混凝土的韧度最好;相同应变率范围内,碳纤维混凝土的韧度优于玄武岩纤维混凝土.Dynamic mechanical properties of concrete reinforced with four volumetric fractions of carbon fiber and basalt fiber subjected to various high strain rates were studied, and compared with each other. Details of an experimental investigation using 100-mm-diameter split Hopkinson pressure bar （SHPB） apparatus were presented. The results show that the relationship between dynamic compressive strength of fiber reinforced concrete and the strain rate can be expressed by lin ear approximations. The relationship between dynamic strength increase rate（DSIR） and the strain rate can be expressed by logarithm approximations. The dynamic compressive strength of 0.1 % volumetric fraction basalt fiber reinforced concrete（BFRC） is higher than others, and the impact toughness of 0.3 % volumetric fraction carbon fiber reinforced concrete （CFRC） is best. With the same strain rate, the impact toughness of CFRC proves to be better than BFRC.

关 键 词：碳纤维混凝土 玄武岩纤维 分离式霍普金森压杆 动态压缩力学性能 

分 类 号：TU502.528[建筑科学—建筑技术科学]