摘要
利用改进了的楔劈拉伸试验方法,对尺寸为200 m m ×200 mm ×100 m m 的小型试件在不同的预制裂缝( 初始裂缝)下的混凝土的开裂、裂缝稳定扩展进行了研究.试验结果表明,利用Shah 等人提出的双参数模型所求得的混凝土稳定断裂韧度KsIc 与混凝土的初始裂缝长度a0 无关,同时还发现混凝土临界裂缝尖端张开位移CTODc 及裂缝过程区长度ae 与初始裂缝长度a0 成反比关系.由于该方法所得到的结果同相应的三点弯曲试验所得到的结果几乎一致,因此其有可能成为判断混凝土失稳断裂材料参数的方法.
By using the improving wedge split tensile testing method, the crack of the concrete and the stable development of crack were researched. The samples of 200 mm×200 mm×100 mm under the different prefabrication condition were used. The test results showed that the stable fracture toughness K s Ic obtained by the double parameter model (suggested by S.P. Shah) has nothing to do with the initial crack length a 0. Meanwhile, we found that CTOD c and a e are inversely proportional to a 0. For the conclusion of this paper is almost coincide with three point bending test, it is possible to decide the unstable crack parameter of concrete material through this improving testing method.
出处
《建筑材料学报》
EI
CAS
CSCD
1999年第3期212-217,共6页
Journal of Building Materials
关键词
楔劈拉伸试验
混凝土
断裂特性
wedge split tensile test
concrete
fracture properties