Implosion-Induced Collapse Effect of Initial Penetration Damage on Concrete Structures with Finite Thickness

Hao Geng,Zhongzheng Jiang,Hao Lu,Mu Huang,Ziming Xiong,Songlin Yue,Shanzheng Sun

doi:10.1155/2020/6126348

Hao Geng, Zhongzheng Jiang + Show 5 more

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https://doi.org/10.1155/2020/6126348

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Abstract

Attacks using penetration-explosion warheads can cause the backside of concrete targets to collapse. Current research on collapse damage mainly focuses on the damage caused by external explosions and the damage of targets with prefabricated holes under internal blasts. However, the penetration effect also affects the destructive effect of the explosion-induced collapse, so experiments on prefabricated borehole charges cannot fully reflect real implosions. To study the effect of the initial penetration damage of imploding concrete structures with finite thickness on their collapse, in this study, field experiments are carried out on concrete targets with different initial penetration damage. The collapse damage of the targets is analyzed, and the dimensional analysis method is used to fit the experimental data and obtain the rules and prediction methods of the effect of the initial penetration damage on the relative collapse thickness. The collapse depth of the concrete targets is found to decrease with the increase in the impact energy factor; this increase is found to reduce gradually until stabilization. The conclusion has been verified and analyzed in depth through numerical simulations. The results of this study can provide a basis for subsequent simulations of the actual penetration and explosion effects and a reference for the optimal protection design of concrete structures and the optimal damage design of penetration-explosion warheads.

Highlights

Penetration-explosion warheads are currently the first choice of weapon against concrete targets. ey rely on the kinetic energy or jets to penetrate a certain depth inside the target and detonate high-energy charges to damage the target
We experimentally investigate the damage of the back of a finite-thickness concrete structure under different initial damage conditions and column-type charges
It is of great practical significance to study the effects of the initial penetration damage on the implosion-induced collapse of concrete structures with finite thickness. is study compared the implosion-induced collapse depth of concrete targets with finite thickness under different initial penetration damage through field experiments. e equations obtained by the dimensionless analysis were verified via numerical simulations. e following main conclusions were drawn

Summary

Introduction

Penetration-explosion warheads are currently the first choice of weapon against concrete targets. ey rely on the kinetic energy or jets to penetrate a certain depth inside the target and detonate high-energy charges to damage the target. Penetration-explosion warheads are currently the first choice of weapon against concrete targets. Warheads damage concrete structures of finite thickness in the area near the impact point. Depending on the destructive effect, the collapse caused by the warhead to the structure can be categorized into impact collapse and explosion collapse [2]. Collapse is an important form of damage to concrete structures caused by earth penetrator weapons. After the warhead hits the target, under the effect of explosion and (or) impact, the concrete structure with finite thickness will experience collapse damage on its back side. When the compressive stress wave generated by the explosion load (or impact load) propagates to the back of the structure, a strong tensile wave is generated, which causes the concrete on the back of the structure to collapse and spallate, forming concrete fragments of different sizes. When the compressive stress wave generated by the explosion load (or impact load) propagates to the back of the structure, a strong tensile wave is generated, which causes the concrete on the back of the structure to collapse and spallate, forming concrete fragments of different sizes. ese concrete fragments have a high speed and can hurt personnel and damage equipment [3]

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