Mesoscopic Insight into the Damage Mechanism for the Static Preload Effect on Dynamic Tensile Strength of Concrete
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 2
Abstract
Experimental studies have showed that the static preload increases the dynamic tensile strength of concrete under certain conditions. But its mechanism still remains open. In this study the authors focus on the dynamical damage failure mechanism of concrete with the static preload, and propose a mesoscopic damage dynamical model to evaluate the elastic modulus and strength enhancement parameters of concrete that is considered as a three-phase heterogeneous composite material. A mesoscopic dynamical model is developed to implement the numerical simulations of dynamic flexural-tensile damage and failure processes of concrete under shockwave and cyclic triangular wave loads. The numerical results agree well with the experimental ones reported in previous studies. This study illuminates that the static preload has an enhancement effect on the dynamic tensile strength. Such an effect essentially results from the double-sided features of the strain rate enhancement and damage deterioration of concrete.
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Acknowledgments
The study was supported by the National Key Research and Development Program of China (Grant Nos. 2017YFC0404906 and 2017YFC0404902), the National Natural Science Foundation of China (Grant Nos. 51679265, 11772120, and 51478168), the Natural Science Foundation of Jiangsu Province (Grant No. BK20170096), the Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (Grant Nos. 2016TS09, 2016ZY10, and IWHR-SKL-201709), and IWHR Research & Development Support Program (Grant No. EB0145B412016). The State Scholarship Fund from China scholarship council is also greatly acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 2 • February 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 31, 2018
Accepted: Aug 9, 2018
Published online: Nov 29, 2018
Published in print: Feb 1, 2019
Discussion open until: Apr 29, 2019
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