长江科学院院报Issue(2)：114-118,5.DOI:10.3969/j.issn.1001-5485.2015.02.023
不同初始缝高比楔入劈拉试件断裂试验研究
Fracture Toughness of Specimen with Different Initial Seam-Height Ratio under Wedge Splitting Test
摘要
Abstract
The effect of initial seam-height ratio on concrete’s fracture performance was researched through wedge splitting test.Four groups including 32 specimens with different initial seam-height ratio were tested.The eigenval-ues of parameters and the corresponding process curves of complete load,crack opening displacement and concrete surface strain were determined.Fracture parameters inclusive of effective crack length ac ,initial fracture toughness KiniIC and unstable fracture toughness KunIC were calculated based on double-K fracture theory.Results indicate that along with the increase of seam-height ratio,the effective crack length ac increassd and the subcritical crack propa-gation length Δac reduces;KiniIC is not affected by the initial seam-height ratio,and KunIC increases with the reduction of seam-height ratio,but when a0 /D≥0.5,it can be considered as a constant.关键词
初始缝高比/楔入劈拉试验/双 K 断裂韧度/有效裂缝长度/混凝土断裂性能Key words
initial seam-height ratio/wedge splitting test/double-K fracture toughness/effective crack length/concrete’s fracture performance分类
建筑与水利引用本文复制引用
胡少伟,谢建锋,喻江..不同初始缝高比楔入劈拉试件断裂试验研究[J].长江科学院院报,2015,(2):114-118,5.基金项目
国家自然科学基金项目（51279111，51309163）；国家杰出青年科学基金项目（51325904）；南京水利科学研究院基本科研业务费专项资金项目 （）
