采用最大尺寸为１２００ｍｍ×１２００ｍｍ×２００ｍｍ的楔入劈拉试件研究了试件高度对砼断裂能的影响．结果表明，断裂能ＧＦ在一定范围内存在尺寸效应，但当试件高度ｈ＞８００ｍｍ时，所测得的ＧＦ值与试件高度无关．这一结论对大型砼结构的非线性开裂计算具有重要意义 The influence of the specimen height on the fracture energy of concrete was studied by using a wedge specimen with a maximum dimension of 1200 mm×1200 mm×200 mm. The results show that there is a size effect of the fracture energy GF within a certain range, but when the height of the specimen is h>800mm, the measured GF value has nothing to do with the height of the specimen. This conclusion is of great significance for the nonlinear cracking calculation of large concrete structures.