| Civil Engineering |
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| Predicting unstable toughness of concrete based on initial toughness criterion |
| Long-bang Qing, Wen-ling Tian, Juan Wang |
| College of Civil Engineering, Hebei University of Technology, Tianjin 300401, China; Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401, China; College of Water Conservancy and Environment Engineering, Zhengzhou University, Zhengzhou 450001, China |
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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.
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Received: 08 August 2013
Published: 27 January 2014
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