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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

http://doi.org/10.1631/jzus.A1300261


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.

@article{title="Predicting unstable toughness of concrete based on initial toughness criterion",
author="Long-bang Qing, Wen-ling Tian, Juan Wang",
journal="Journal of Zhejiang University Science A",
volume="15",
number="2",
pages="138-148",
year="2014",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1300261"
}

%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

TY - JOUR
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


Abstract: 
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.

基于起裂韧度准则的混凝土失稳韧度预测研究

研究目的:研究混凝土失稳韧度的理论预测方法。
创新要点:1.提出混凝土失稳韧度的理论预测方法;2.利用楔入劈拉试件计算不同级配混凝土的失稳韧度;3.研究失稳韧度受拉伸软化曲线的影响。
研究方法:1.基于起裂韧度扩展准则,采用理论分析手段研究混凝土的失稳韧度计算方法;2.利用楔入劈拉试件(见图3)计算不同级配混凝土的失稳韧度。
重要结论:1.基于起裂韧度准则可合理地预测峰值荷载状态及失稳韧度;2.混凝土失稳韧度受断裂能的影响较小;3.拉伸软化曲线对混凝土失稳韧度的影响较小。

关键词:混凝土;起裂韧度;失稳韧度;楔入劈拉实验

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

References

[1] Bazant, Z.P., 1984. Size effect in blunt fracture: concrete, rock, metal. Journal of Engineering Mechanics, 110(4):518-535. 


[2] Bazant, Z.P., Oh, B.H., 1983. Crack band theory for fracture of concrete. Material and Structure, 16(3):155-177. 


[3] Bazant, Z.P., Planas, J., 1998.  Fracture and Size Effect in Concrete and Other Quasibrittle Materials. CRC Press,Boca Raton :

[4] DL/T 5332-2005, 2006.  Specification for Fracture Test of Hydraulic Concrete. (in Chinese), China Electric Power Press,Beijing, China :

[5] Dong, W., Wu, Z.M., Zhou, X.M., 2013. Calculating crack extension resistance of concrete based on a new crack propagation criterion. Construction and Building Materials, 38:879-889. 


[6] Elices, M., Planas, J., 1991. Material models.  Fracture Mechanics of Concrete Structures from Theory to Applications. Report of RILEM Technical Committee 90-FMT. Chapman & Hall,London :16-65. 

[7] Hillerborg, A., Modeer, M., Petersson, P.E., 1976. Analysis of crack formation crack growth in concrete by means of fracture mechanics and finite elements. Cement and Concrete Research, 6(6):773-782. 


[8] Jenq, Y.S., Shah, S.P., 1985. Two parameter fracture model for concrete. Journal of Engineering Mechanics, 111(10):1227-1241. 


[9] Jenq, Y.S., Shah, S.P., 1985. A fracture toughness criterion for concrete. Engineering Fracture Mechanics, 21(5):1055-1069. 


[10] Karihaloo, B.L., Nallathambi, P., 1990. Effective cracks model for the determination of fracture toughness (KICS) of concrete. Engineering Fracture Mechanics, 35(4-5):637-645. 


[11] Kumar, S., Barai, S.V., 2008. Influence of specimen geometry and size-effect on the KR -curve based on the cohesive stress in concrete. International Journal of Fracture, 152(2):127-148. 


[12] Kumar, S., Barai, S.V., 2009. Determining double-K fracture parameters of concrete for compact tension and wedge splitting tests using weight function. Engineering Fracture Mechanics, 76(7):935-948. 


[13] Li, Q.B., Qing, L.B., Guan, J.F., 2012. Analysis of the whole fracture process of concrete considering effects of cohesive distribution. Journal of Hydraulic Engineering, (in Chinese),43(Sup.):31-36. 

[14] Mai, Y.W., 2002. Cohesive zone and crack-resistance (R)-curve of cementitious materials and their fibre-reinforced composites. Engineering Fracture Mechanics, 69(2):219-234. 


[15] Qing, L.B., Li, Q.B., 2013. A theoretical method for determining initiation toughness based on experimental peak load. Engineering Fracture Mechanics, 99:295-305. 


[16] Reinhardt, H.W., 1985. Plain concrete modeled as an elastic strain-softening material at fracture. Engineering Fracture Mechanics, 22(5):787-796. 


[17] Reinhardt, H.W., Xu, S.L., 1999. Crack extension resistance based on the cohesive force in concrete. Engineering Fracture Mechanics, 64(5):563-587. 


[18] Reinhardt, H.W., Cornelissen, H.A.W., Hordijk, D.A., 1986. Tensile tests and failure analysis of concrete. Journal of Structural Engineering, 112(11):2462-2477. 


[19] Tada, H., Paris, P.C., Irwin, G., 2000. The Stress Analysis of Cracks Handbook, , New York, :

[20] Wu, Z.M., Dong, W., Liu, K., Yang, S.T., 2007. Mode I crack propagation criterion of concrete and numerical simulation on complete process of cracking. Journal of Hydraulic Engineering, (in Chinese),38:46-52. 

[21] Xu, S.L., Reinhardt, H.W., 1999. Determination of double-K criterion for crack propagation in quasi-brittle fracture, Part I: experimental investigation of crack propagation. International Journal of Fracture, 98(2):111-149. 


[22] Xu, S.L., Reinhardt, H.W., 1999. Determination of double-K criterion for crack propagation in quasi-brittle fracture, Part II: analytical evaluating and practical measuring methods for three-point bending notched beams. International Journal of Fracture, 98(2):151-177. 


[23] Xu, S.L., Reinhardt, H.W., 1999. Determination of double-K criterion for crack propagation in quasi-brittle fracture, Part III: compact tension specimens and wedge splitting specimens. International Journal of Fracture, 98(2):179-193. 


[24] Xu, S.L., Reinhardt, H.W., 2000. A simplified method for determining double-K fracture parameters for three-point bending tests. International Journal of Fracture, 104(2):181-209. 


[25] Xu, S.L., Zhou, H.G., Gao, H.B., Zhao, S.Y., 2006. An experimental study on double-K fracture parameters of concrete for dam construction with various grading aggregates. China Civil Engineering Journal, 39(11):50-62. 

[26] Zhang, J., Leung, K.Y., Xu, S.L., 2010. Evaluation of fracture parameters of concrete from bending test using inverse analysis approach. Materials and Structure, 43(6):857-875. 


[27] Zhang, X.F., Xu, S.L., 2011. A comparative study on five approaches to evaluate double-K fracture toughness parameters of concrete and size effect analysis. Engineering Fracture Mechanics, 78(10):2115-2138. 



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