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通过对36组混凝土试件在不同加载速率下进行抗折试验,探索了试件尺寸对混凝土动态力学性能的影响规律。试验中采用混凝土试件尺寸分别为40 mm×40 mm×160 mm,100 mm×100 mm×400 mm和150 mm×150 mm×600 mm3种,加载速率分别为0.5、5、50和500 mm/min4个等级。研究结果表明:混凝土抗折强度随着加载速率增加而增大;在同一加载速率下,混凝土抗折强度随着尺寸增加而减小;大尺寸的混凝土试件动力强度增加更为明显;同一加载速率下,不同试件尺寸混凝土试件的破坏模式没有明显差别,这一特征使得可以将不同尺寸混凝土结构的动力破坏过程分析进行简化。
By testing the flexural strength of 36 concrete specimens under different loading rates, the influence of specimen size on the dynamic mechanical properties of concrete was explored. The concrete specimens used in the experiment were 40 mm × 40 mm × 160 mm, 100 mm × 100 mm × 400 mm and 150 mm × 150 mm × 600 mm, respectively, and the loading rates were 0.5, 5, 50 and 500 mm / min4 level. The results show that the flexural strength of concrete increases with the increase of loading rate. Under the same loading rate, the flexural strength of concrete decreases with the increase of size. The dynamic strength of concrete with large size increases more obviously. The failure modes of concrete specimens with different specimen sizes are not significantly different, which makes it possible to simplify the analysis of the dynamic failure process of concrete structures of different sizes.