本文以20根三点弯曲试样,分五组以五个不同的加荷速度进行试验,研究了加荷速度对同一种混凝土断裂韧度K_(IC)值的影响。结果表明,加荷速度对K_(IC)值是有影响的,随着加荷速度的增加,混凝土的K_(IC)值也随之增大。本文还给出了二者的经验关系式,从而可知,当加荷速度增加10倍时,混凝土的K_(IC)的值约增大6％ In this paper, 20 three-point bending specimens were divided into five groups and tested at five different loading speeds. The effect of loading speed on the fracture toughness K_(IC) value of the same concrete was studied. The results show that the loading rate has an effect on the K_(IC) value. With the increase of the loading rate, the K_(IC) value of the concrete also increases. This article also gives the empirical relationship between the two, it can be seen that when the loading speed increases 10 times, the concrete K_ (IC) value increases by about 6%