Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete
In this study, to confirm the effect of confining pressure on dynamic mechanical behavior and failure modes of concrete, a split Hopkinson pressure bar dynamic loading device was utilized to perform dynamic compressive experiments under confined and unconfined conditions. The confining pressure was...
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Format: | Article |
Language: | English |
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Elsevier
2021-09-01
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Series: | International Journal of Mining Science and Technology |
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Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268621000616 |
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author | Pengfei Liu Xiaoping Zhou Qihu Qian |
author_facet | Pengfei Liu Xiaoping Zhou Qihu Qian |
author_sort | Pengfei Liu |
collection | DOAJ |
description | In this study, to confirm the effect of confining pressure on dynamic mechanical behavior and failure modes of concrete, a split Hopkinson pressure bar dynamic loading device was utilized to perform dynamic compressive experiments under confined and unconfined conditions. The confining pressure was achieved by applying a lateral metal sleeve on the testing specimen which was loaded in the axial direction. The experimental results prove that dynamic peak axial stress, dynamic peak lateral stress, and peak axial strain of concrete are strongly sensitive to the strain rate under confined conditions. Moreover, the failure patterns are significantly affected by the stress-loading rate and confining pressure. Concrete shows stronger strain rate effects under an unconfined condition than that under a confined condition. More cracks are created in concrete subjected to uniaxial dynamic compression at a higher strain rate, which can be explained by a thermal-activated mechanism. By contrast, crack generation is prevented by confinement. Fitting formulas of the dynamic peak stress and dynamic peak axial strain are established by considering strain rate effects (50–250 s−1) as well as the dynamic confining increase factor (DIFc). |
first_indexed | 2024-12-16T07:34:21Z |
format | Article |
id | doaj.art-6d30facd16db4e50af0271adca69839b |
institution | Directory Open Access Journal |
issn | 2095-2686 |
language | English |
last_indexed | 2024-12-16T07:34:21Z |
publishDate | 2021-09-01 |
publisher | Elsevier |
record_format | Article |
series | International Journal of Mining Science and Technology |
spelling | doaj.art-6d30facd16db4e50af0271adca69839b2022-12-21T22:39:16ZengElsevierInternational Journal of Mining Science and Technology2095-26862021-09-01315939951Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concretePengfei Liu0Xiaoping Zhou1Qihu Qian2School of Civil Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Civil Engineering, Chongqing University, Chongqing 400044, China; School of Civil Engineering, Wuhan University, Wuhan 430072, China; Corresponding author.PLA University of Science and Technology, Nanjing 210007, ChinaIn this study, to confirm the effect of confining pressure on dynamic mechanical behavior and failure modes of concrete, a split Hopkinson pressure bar dynamic loading device was utilized to perform dynamic compressive experiments under confined and unconfined conditions. The confining pressure was achieved by applying a lateral metal sleeve on the testing specimen which was loaded in the axial direction. The experimental results prove that dynamic peak axial stress, dynamic peak lateral stress, and peak axial strain of concrete are strongly sensitive to the strain rate under confined conditions. Moreover, the failure patterns are significantly affected by the stress-loading rate and confining pressure. Concrete shows stronger strain rate effects under an unconfined condition than that under a confined condition. More cracks are created in concrete subjected to uniaxial dynamic compression at a higher strain rate, which can be explained by a thermal-activated mechanism. By contrast, crack generation is prevented by confinement. Fitting formulas of the dynamic peak stress and dynamic peak axial strain are established by considering strain rate effects (50–250 s−1) as well as the dynamic confining increase factor (DIFc).http://www.sciencedirect.com/science/article/pii/S2095268621000616Strain rate effectMultiaxial loadingDynamic peak axial stressThermo-activated mechanismDynamic increase factor |
spellingShingle | Pengfei Liu Xiaoping Zhou Qihu Qian Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete International Journal of Mining Science and Technology Strain rate effect Multiaxial loading Dynamic peak axial stress Thermo-activated mechanism Dynamic increase factor |
title | Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete |
title_full | Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete |
title_fullStr | Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete |
title_full_unstemmed | Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete |
title_short | Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete |
title_sort | experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete |
topic | Strain rate effect Multiaxial loading Dynamic peak axial stress Thermo-activated mechanism Dynamic increase factor |
url | http://www.sciencedirect.com/science/article/pii/S2095268621000616 |
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