In the present paper, experimental investigation on dynamic compression was carried out by using SHPB to get dynamic compression strengths under different strain state of con-crete(D = 74 mm), and the strain rate sensitivity on dynamic compression behaviour of concrete was studied. A critical strain rate was discovered. According to the experimental results, with the increase of strain rate of specimen, dynamic compression strengths increased in different extent. On the basis of the experiment, the effects of strain rate on the compression strengths of concrete were analyzed. Compression strengths exhibited a critical strain rate,beyond which large increases in strength occurred. This critical strain rate was approximately 40 s-1 for compression.%采用分离式Hopkinson压杆对混凝土试件(D=74 mm)进行了动态压缩试验,得到了不同应变率下的混凝土动态抗压强度,研究了它的率敏感性,并得到了相应的临界应变率.结果表明:随着试件中应变率的增大,混凝土的动态抗压强度相应有不同比例的增加；同时在试验的基础上,分析了应变率对混凝土抗压强度的影响.抗压强度在相应的应变率超过一定值后会有一个较大比例的增加,抗压强度的临界应变率大约是40 s-1.
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