水利水电科技进展2017，Vol.37Issue(2)：37-42,6.DOI:10.3880/j.issn.1006-7647.2017.02.007
基于起裂韧度准则的混凝土裂缝黏聚区特性
Characteristics of cohesive zone of concrete cracks based on initial fracture toughness criterion
摘要
Abstract
The characteristics of the cohesive zone at crack tips throughout the fracture process were studied based on the initial fracture toughness ( IFT ) criterion and cohesive crack model. Single-edge notched beams with different sizes, subjected to three-point bending, were used as specimens, and the length of the cohesive zone at crack tips, the cohesive stress of concrete, and the crack opening displacement ( COD) were calculated. The calculated results were verified with the results from tests and the finite element method ( FEM ) . Results show that the maximum and critical lengths of the cohesive zone increase with the size of specimens; the maximum length of the cohesive zone is influenced by the tensile softening curve, while the whole fracture process is slightly affected by the tensile softening curve; after the peak load is reached, the COD is approximately linearly distributed; and the distribution of cohesive stresses depends on the tensile softening curve.关键词
混凝土/黏聚区/起裂韧度/裂缝张开位移/黏聚力Key words
concrete/cohesive zone/initial fracture toughness/crack opening displacement/cohesive stress分类
建筑与水利引用本文复制引用
卿龙邦,聂雅彤..基于起裂韧度准则的混凝土裂缝黏聚区特性[J].水利水电科技进展,2017,37(2):37-42,6.基金项目
国家自然科学基金(51309073) （51309073）
河北省自然科学基金(E2014202257) （E2014202257）
高等学校博士学科点专项科研基金(20131317120012) （20131317120012）
