Anti-penetration capability of pre-stressed confined concrete with truncated cone

WANG Ziguo; WANG Songtao; KONG Xiangzhen; SUN Yuyan

doi:10.11883/bzycj-2022-0030

Volume 42 Issue 10

Oct. 2022

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WANG Ziguo, WANG Songtao, KONG Xiangzhen, SUN Yuyan. Anti-penetration capability of pre-stressed confined concrete with truncated cone[J]. Explosion And Shock Waves, 2022, 42(10): 103303. doi: 10.11883/bzycj-2022-0030

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WANG Ziguo, WANG Songtao, KONG Xiangzhen, SUN Yuyan. Anti-penetration capability of pre-stressed confined concrete with truncated cone[J]. Explosion And Shock Waves, 2022, 42(10): 103303. doi: 10.11883/bzycj-2022-0030

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Anti-penetration capability of pre-stressed confined concrete with truncated cone

doi: 10.11883/bzycj-2022-0030

1.
School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, Shandong, China
2.
State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China

Received Date: 2022-01-21
Rev Recd Date: 2022-06-29

Available Online: 2022-07-04

Publish Date: 2022-10-31

Abstract

Abstract

The penetration resistance of concrete can be greatly improved by lateral confinement, and it would be continued to increase when pre-stress is further applied. However, the existing methods are difficult to realize the pre-stress on the confined concrete. In this paper, a relatively simple method for pre-stress confinement is proposed. Based on the principle of wedging the wedge-shaped block, a truncated cone-shaped concrete target with a cone inclination of 3° and a diameter slightly larger than the ferrule was squeezed into the matching steel ferrule, so the concrete target was pre-stressed along the radial direction by means of cone-shaped fitting and tightening, while the pre-stress was controlled by the indicators such as the pressing depth of the concrete target, the margin, and the pressing force. The feasibility of this method is then verified by simulation using LS-DYNA, and the penetration resistance of pre-stressed confined concrete is studied by the so-called restart algorithm. Numerical results demonstrate that the proposed method can provide enough radial pre-stress to the confined concrete target, and the pre-stress of the target increases approximately linearly with the increase of the pressing depth or the margin. Furthermore, within a certain range, the penetration resistance of the concrete target increases with the increase of pre-stress, while it decreases rapidly when the pre-stress is too high, which causes the damage of the concrete target. Parametric study on the parameters such as steel ferrule strength, concrete strength, steel ratio and projectile velocity, shows that reasonable matching of the steel ferrule strength with the concrete strength and selection of appropriate steel ratio of the target can effectively improve the pre-stress, penetration resistance of the target and the efficiency of steel; the higher the projectile velocity, the more obvious the effect of pre-stress on the improvement of the anti-penetration performance of the target. The proposed method for applying pre-stress provides a new approach to improve the anti-penetration capability of brittle materials such as concrete.
- pre-stress,
- penetration,
- confinement,
- concrete,
- LS-DYNA

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References(32)

References

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