两片诱导缝碾压混凝土试件断裂韧度的求解

The Fracture Toughness of Two Induced Crack in RCC Specimen

对相同削弱度不同间距的两片诱导缝碾压混凝土试件进行了轴拉试验研究,得到了其对应的等效强度值,在考虑试件尺寸修正和不同诱导缝间距修正的基础上,把碾压混凝土诱导缝缝端应变软化简化为抛物线模型,计算了不同间距诱导缝试件的断裂韧度。计算结果表明:相对于同削弱度的一片诱导缝试件的断裂韧度,两片诱导缝试件断裂韧度降低较大,并且间距对其断裂韧度有一定的影响。

Experimental data about the equivalent strength of the induced crack are obtained from direct tension experiments towards the cuboid specimens. In view of the infection of dimension of specimen and the distance between two induced cracks, the fracture toughness is gained on the base of parabola model. The results reveal that the fracture toughness of two induced cracks is smaller than that of one induced crack, which has the same weaken degree as the former. And it shows that the distance between two induced cracks has some effect on the fracture toughness of the specimen.