Hits:

Indexed by:期刊论文

Date of Publication:2013-11-01

Journal:JOURNAL OF ENGINEERING MECHANICS

Included Journals:SCIE、Scopus

Volume:139

Issue:11

Page Number:1530-1538

ISSN No.:0733-9399

Key Words:Concrete; Cracking; Numerical analysis; Concrete; Crack-propagation criterion; Mixed mode I-II fracture; Numerical method

Abstract:A crack-propagation criterion is proposed in this paper for mixed-mode I-II fracture in concrete. In this criterion, crack propagation is initiated when the difference between the stress-intensity factor at the crack tip caused by the external force and that by the cohesive stress satisfies the crack-initiation equation. On the basis of this criterion, a numerical method is developed to simulate mixed-mode I-II crack propagation in concrete. To verify the criterion, three sets of experimental data are selected: one is obtained from the self-conducted test and the other two are collected from the literature. The numerical results show that the calculated load versus crack-mouth opening and sliding displacement curves and crack trajectories are in good agreement with experimental results. Therefore, once the mode I initial cracking toughness, elastic modulus, fracture energy, possion's ratio, and tensile strength of concrete are available, the whole mixed-mode I-II fracture process in concrete can be predicted with reasonable accuracy.