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从试件尺寸为剪切断裂韧度的主要影响因素来考虑,制作了5组40个不同长度和高度的混凝土对称加载试件,通过对试件的荷载-裂缝尖端滑移位移曲线、荷载-应变曲线以及荷载-时间曲线的分析,研究了不同长度和高度对剪切断裂韧度的影响。试验结果表明,试件的稳定度会随着试件长度的增加而提高,随着试件高度的增加而降低;断裂韧度会随着试件长度的增加而增大,随着试件高度的增大而减小;断裂韧度的尺寸效应随着试件宽度的增加而减弱,随试件高度的增大而增强。
Considering the main factors influencing shear fracture toughness, five groups of 40 concrete specimens with different lengths and heights were made. Through the analysis of load-crack tip displacement and displacement curve, load- Strain curves and load-time curve analysis of the impact of different lengths and heights on the shear fracture toughness. The experimental results show that the stability of the specimen increases with the increase of the specimen length and decreases with the increase of the specimen height. The fracture toughness increases with the increase of the specimen length. With the specimen height The size effect of fracture toughness decreases with the increase of the specimen width and increases with the increase of specimen height.