支承形式对楔入劈拉试件断裂韧度K_(IC)的影响  

Effect of support forms on fracture toughness K_(ⅠC) of wedge splitting specimens

作　　者：黄闽莉[1] 王向东[1] 曹亮[1] 

机构地区：[1]河海大学土木工程学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2006年第4期435-439,共5页Journal of Hohai University(Natural Sciences)

摘　　要：对楔入劈拉试验中试件的受力状况进行了分析.结果表明:除水平力会对裂缝的失稳扩展产生影响外,外载的竖向分力、传力装置自重及试件自重也会对裂缝的失稳扩展产生影响;竖向力对断裂韧度KⅠC的影响与楔入劈拉试验所采用的支承形式有关,即在双支座情况下,自重和竖向分力的影响均可忽略不计,而在单支座情况下,应考虑自重和竖向分力的影响.Stress analysis performed on wedge splitting specimens shows that, besides the horizontal component of extemal loads, the vertical component of external loads, the self-weight of stress transfer device, and the self-weight of specimens, are of certain impacts on instable development of cracks, and that the impact of the vertical component on the fracture toughness KIC in wedge splitting experiments is related to the support form： with double supports, the impacts of self-weight and vertical component could be neglected, while the above factors should be considered under single support.

关 键 词：混凝土 楔入劈拉试验 单支座 双支座 断裂韧度KIC 

分 类 号：O346.1[理学—固体力学]