Effect of Prestatic Loading on Dynamic Tensile Strength of Concrete under High Strain Rates
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 12
Abstract
The static bending tests and the split Hopkinson pressure bar (SHPB) dynamic bending tests of concrete are investigated in this paper, and the effects of different initial static loading history on the dynamic tensile strength of concrete are explored. The initial static loadings are divided into five grades, 0, 25, 50, 75, and 90% of static tensile strength, respectively. A large number of mesostructure images of specimens have been obtained by the means of a scanning electron microscope (SEM) and used to analyze the influence of the microstructure and microcrack propagation on the dynamic performance of concrete. In addition, the Weibull distribution model is introduced to analyze the test results, which show that the dynamic tensile strength of concrete increases significantly with an increase in strain rate. When the initial static loading level does not exceed 50%, dynamic tensile strength is basically stable; but when the initial static loading level is more than 75%, dynamic strength begins to decrease.
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Acknowledgments
This research is based upon work supported by the National Natural Science Foundation of China (Grant No. 51509078), Natural Science Foundation of Jiangsu Province (Grant No. BK20150820), and the Fundamental Research Funds for the Central Universities (2016B06014) granted to the first author Dr. Xudong Chen. The authors also appreciate the anonymous reviewers and editors for their valuable suggestions and comments.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 8, 2016
Accepted: May 25, 2016
Published online: Jul 20, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 20, 2016
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