混凝土动态直接拉伸实验技术研究

Study of Experimental Technique for Concrete Dynamic Direct Tension

霍普金森压杆(Split Hopkinson Pressure Bar,简称为SHPB)实验装置越来越多地被应用于混凝土等脆性材料动态压缩力学性能的研究之中。由于种种原因,混凝土动态拉伸的实验研究一般还是通过SHPB实验装置间接进行(例如层裂实验和巴西圆盘实验等)。本文以C30混凝土材料为例,根据霍普金森实验技术的两个基本假定(一维假定和均匀假定),探讨了利用大直径(Φ75mm)霍普金森拉杆(Split Hopkinson Tension Bar,简称为SHTB)实验装置对混凝土类试件进行动态直接拉伸的实验技术问题,提出了一种可行的对混凝土类材料进行直接动态拉伸实验的方法。

Split Hopkinson pressure bar （SHPB） apparatus is increasingly being used to investigate the dynamical compressive behavior of brittle materials such as concrete. Due to various reasons, experimental study of concrete dynamical tensile behavior is commonly carried out indirectly based on SHPB apparatus（for example by spalling test or brazilian disk test）. In order to implement direct dynamical tension experiment for C30 concrete, a large-diameter （Ф75 mm） split Hopkinson tension bar （SHTB） was applied, based on two basic assumptions of Hopkinson experimental technique （one- dimensional and uniformity）. A feasible direct dynamical tension experiment technique for concrete materials is proposed in this paper.