摘要
本文讨论了混凝土Ⅱ型断裂的机理,并给出了一个产生Ⅱ型断裂的充分条件.从而,提出了Ⅱ型虚拟裂纹模型(FCM).并据此用有限元计算了属于Ⅱ型的剪切断裂能和压剪断裂能.在用刚性加载架对混凝土试样测得剪切荷载-切口相对位移全曲线的基础上,获得了剪切断裂能和压剪断裂能的试验值,它与电算值相当接近.试验结果表明,混凝土Ⅱ型断裂能约为Ⅰ型断裂能的20倍.
In this paper, the mechanism of mode Ⅱ fracture of concrete is described and a sufficient condition under which mode Ⅱ fracture will happen is given. Since the fictitious crack mode (FCM) of mode Ⅱ has been derived, the shear fracture energy and the compression-shear fracture energy can be calculated. Based on the experiment carried out about the T-u cuarve with a rigid loading frame, the experimental values of the shear fracture energy and the compression-shear fracture energy have been obtained, which are very close to the calculated values. The results show that G? is about 20-times larger then G?.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
1990年第3期8-14,共7页
Journal of Hohai University(Natural Sciences)
基金
国家自然科学基金
关键词
混凝土
Ⅱ型
断裂
FCM
断裂能
mode Ⅱ fracture
fictitious crack mode Ⅱ
fracture energy
shear
compression-shear
rigid loading frame
