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首页> 外文期刊>Case Studies in Construction Materials >Steel fiber reinforced concrete panels subjected to impact projectiles with different caliber sizes and muzzle energies
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Steel fiber reinforced concrete panels subjected to impact projectiles with different caliber sizes and muzzle energies

机译：钢纤维钢筋混凝土面板采用不同口径尺寸和枪口能量的冲击射弹

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摘要

In special situations like terrorist attacks, concrete structures are occasionally subjected to impact loads such as firearms. Since concrete is brittle, it often shatters into several pieces under impact loadings. In order to alleviate this brittleness, fibers are generally incorporated into concrete. In this study, steel fiber reinforced concrete panels subjected to projectile impact loads with different geometries was investigated. The impactors in the form of bullets came in three different caliber sizes 9, 11, and 7.62?mm, providing muzzle energies of 468, 1972, and 3259?J, respectively. Hooked end type steel fibers were used at 3?vol fractions of 1–3%. The specimens were cast in square panels with dimensions of 400?×?400?mm and varying thickness from 10 to 100?mm. Each panel was subjected to a single impact at the center. Data in the form of velocity (prior to and after impact event), failure modes, and spalling diameters were collected. Results showed that four typical failure modes were commonly found in panels: perforation, scabbing, spalling, and cracking. For piercing type bullets, the thickness played an important role on the impact resistance of the panels. However, for large and blunt tip bullets, both thickness and fiber volume fraction must be considered together to provide sufficient impact resistance.
机译：在恐怖袭击等特殊情况下，混凝土结构偶尔会受到枪支等冲击载荷。由于混凝土是脆性的，因此它通常会在碰撞载荷下遭到几件。为了缓解这种脆性，纤维通常掺入混凝土中。在这项研究中，研究了钢纤维钢筋混凝土面板，经受不同几何形状的射弹冲击载荷。子弹形式的撞击符在三种不同的口径尺寸9,11和7.62？mm，分别提供468,1972和3259？j的枪口能量。钩状端型钢纤维在3°级数为1-3％。将样品铸造在方块的方板中，尺寸为400Ω×400Ωmm，厚度不同10至100Ωmm。每个面板在中心进行一次撞击。收集速度形式（在碰撞事件之前），故障模式和倒置直径的数据。结果表明，在面板中常见于四种典型的损失模式：穿孔，切割，剥落和开裂。对于刺穿型子弹，厚度在面板的抗冲击性上发挥了重要作用。然而，对于大而钝的尖子弹，必须将厚度和纤维体积分数级分在一起以提供足够的抗冲击性。

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