高强混凝土巴西圆盘动态劈裂试验  

Brazilian Disc Dynamic Split Test of High Strength Concrete

作　　者：赵军[1] 缪昌国[1] 姚如胜 

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]北海艺术设计学院建筑学院,广西北海536000

出　　处：《河南科技大学学报（自然科学版）》2017年第1期56-60,7,共5页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(51568016);广西矿冶与环境科学实验中心项目(KH2011YB025)

摘　　要：以圆形紫铜片作为波形整形器,利用直径100 mm的霍普金森压杆装置,研究了不同弹速冲击下高强混凝土平台巴西圆盘试件的动态拉伸强度,得到了高强混凝土在冲击作用下的劈裂强度、破坏模式和应力时程曲线。试验结果表明:随着冲击应变率的提高,高强混凝土试件的动态劈裂强度和破坏程度不断增大,具有显著的应变率敏感性。高速冲击荷载下的混凝土断面区较为光滑,裂缝直接穿过石子导致试样断裂。In order to investigate the dynamic tension strength of high strength concrete,the flattened Brazilian disc specimens were subjected to impact under different projectile speeds by using the 100 mm diameter split Hopkinson pressure bar( SHPB) where a thin copper circular plate was used as a pulse shaper. The split strength,failure pattern and the stress time-history curve of high strength concrete were studied under impact effect. The results show that the dynamic split strength and damage degree increase with impact strain rate increasing,which show the significant strain rate dependence. Under high speed impact loading,the fracture surface of concrete is smooth. The cracks propagate through the aggregates directly which lead to the fracture of specimen.

关 键 词：动态劈裂试验 高强混凝土 拉伸强度 分离式霍普金森压杆 

分 类 号：TU528.01[建筑科学—建筑技术科学]