中文摘要：

首先使用混凝土细观模型对轴向拉伸试件进行了数值分析，然后，在1：8的尺寸范围内对轴向拉伸试件的强度尺寸效应进行了比较分析。分析表明，试件的强度随试件尺寸的增大而减小。Bazant尺寸效应律和Carpinteri尺寸效应律都能较好地模拟混凝土材料的尺寸效应，对于抗拉强度的尺寸效应现象，Carpinteri多重分形尺寸效应律更为确切些。

英文摘要：

Firstly using the concrete meso-model to carry on the numerical analysis to the axial tensile specimen, then, carrying on the comparative analysis in 1：8 size scope to the axial tensile specimen strength size effect. The analysis indicated that,the specimen strength increases along with the specimen size reduces. The Bazant size effect law and the Carpinteri size effect law all can simulate the size effect of the concrete material well, regarding the tensile strength size effect phenomenon, the Carpinteri multiple fractal size effect law is more accurate.