Release Time:2019-03-09  Hits:

Indexed by: Journal Papers

Date of Publication: 2015-11-01

Journal: ENGINEERING FRACTURE MECHANICS

Included Journals: Scopus、EI、SCIE

Volume: 149

Page Number: 58-73

ISSN: 0013-7944

Key Words: Loading rate; Central-notched split tension cubes; Concrete; Double-K fracture toughness; Critical crack propagation rate

Abstract: The effects of loading rates on concrete double-K fracture parameters were investigated using central-notched split tension cubes, both experimentally and analytically. Four loading rates varying from 10 (5)/s to 10 (2)/s was adopted. Results showed that, with the increase of loading rates, the initiation fracture toughness linearly increased while the unstable fracture toughness varied by a first increase and a followed constant trend. It was also confirmed that double-K fracture model may be further extended to wider dynamic loading rates, such as seismic dynamic excitation. Finally, the models describing the loading rate influences on double-K fracture toughness parameters were developed. (C) 2015 Elsevier Ltd. All rights reserved.