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CLC number: TU528.1

On-line Access: 2014-01-27

Received: 2013-08-08

Revision Accepted: 2013-11-05

Crosschecked: 2014-01-14

Cited: 1

Clicked: 5382

Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE A 2014 Vol.15 No.2 P.138-148


Predicting unstable toughness of concrete based on initial toughness criterion*

Author(s):  Long-bang Qing1,2, Wen-ling Tian1,2, Juan Wang3

Affiliation(s):  1. College of Civil Engineering, Hebei University of Technology, Tianjin 300401, China; more

Corresponding email(s):   qlongbang@126.com

Key Words:  Concrete, Fracture, Initial toughness, Unstable toughness, Wedge splitting tests

Long-bang Qing, Wen-ling Tian, Juan Wang. Predicting unstable toughness of concrete based on initial toughness criterion[J]. Journal of Zhejiang University Science A, 2014, 15(2): 138-148.

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author="Long-bang Qing, Wen-ling Tian, Juan Wang",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Predicting unstable toughness of concrete based on initial toughness criterion
%A Long-bang Qing
%A Wen-ling Tian
%A Juan Wang
%J Journal of Zhejiang University SCIENCE A
%V 15
%N 2
%P 138-148
%@ 1673-565X
%D 2014
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1300261

T1 - Predicting unstable toughness of concrete based on initial toughness criterion
A1 - Long-bang Qing
A1 - Wen-ling Tian
A1 - Juan Wang
J0 - Journal of Zhejiang University Science A
VL - 15
IS - 2
SP - 138
EP - 148
%@ 1673-565X
Y1 - 2014
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1300261

The fracture processes of concrete were described by a cohesive crack model based on initial toughness criterion. The corresponding analytical method to predict the instability state was proposed. In this model, the initial toughness was adopted as the crack propagation criterion and the weight function method was used to calculate the stress intensity factor and the crack opening displacement caused by the cohesive stress. The unstable toughness can be easily obtained using the proposed method without measuring parameters at the critical state that was necessary in traditional methods. The proposed method was verified by existing experimental data of wedge splitting specimens with different grades of concrete and the sensitivity of the results on the tensile softening curve was discussed. The results demonstrate that the proposed method can well predict the peak load, the critical effective crack length, and the unstable toughness of concrete specimens. Moreover, the calculated unstable toughness is not sensitive to the tensile softening curve.




Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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