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Indexed by:Journal Papers

Date of Publication:2015-11-01

Journal:ENGINEERING FRACTURE MECHANICS

Included Journals:SCIE、EI、Scopus

Volume:149

Page Number:58-73

ISSN No.: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.