高速荷载下混凝土断裂性能的试验研究

Experimental study of the fracture characteristics of concrete under high speed loading

本文对混凝土在高速荷载下裂缝的扩展及其断裂性能进行了试验研究．试验结果表明：裂缝扩展的最大速度及加速度随加载速率的增加而增加；动断裂切度随裂缝扩展速率增加而增加；对应于峰值荷载的裂缝扩展量也随加载速率的增加而增加．

The growth of crack and the fracture characteristics of concrete specimen underhigh loading rate were studied by test. Specimens was recorded by high speed motion picture camera with about 8,000 frames per second. The growth of crack in thespecimens. Experimental results show that the maximum speed and accelaration ofcrack growth increases with the loading rater, the dynamic fracture toughness increases with the crack growth speed, the per-peak crack growth increases with theloading rates.