반구형과 평탄형 선단 비상체의 충돌을 받는 콘크리트의 파괴특성
Fracture Property of Concrete on Spherical and Flat Nose Shape Projectile Impact
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초록
본 연구에서는 반구형과 평탄형의 비상체를 이용하여 일반콘크리트와 섬유보강콘크리트에 충격시험을 진행한 후 파괴깊이와 형태, 파괴직경, 배면의 인장변형을 평가하였다. 선단면적이 작을수록 충격력의 집중에 의해 파괴깊이는 크고 표면파괴 직경은 작게 되는 것으로확인되었다. 반면에 선단면적이 클수록 파괴깊이는 작지만 표면파괴직경은 크게 되었다. 일반콘크리트와 섬유보강 콘크리트에서 유사한 표면파괴와 배면변형이 발생하였으나 인장변형의 크기는 일반콘크리트에 비해 섬유보강 콘크리트가 작은 것으로 나타났다. 또한, 비상체의 선단형상에 따른 표면관입의 형태와 배면의 인장변형 사이에 직접적인 연관이 있는 것으로 사료된다. 따라서 콘크리트의 배면박리한계두께 예측 시에는 표면관입깊이뿐만 아니라 배면의 변형거동 또한 고려할 필요성이 있을 것으로 사료된다.
Abstract
In this study, projectiles with 2 kinds of nose shape: spherical and flat were impacted into normal concrete and fiber reinforced concretepanels. The fracture depth and form, crater diameter, tensile strain at rear face were evaluated. It was confirmed that smaller projectile nose areas resultedin deeper penetrations associated with concentrated impact forces and small front-face crater diameters in impact test. Conversely, larger projectilenose areas resulted in shallower penetrations and larger front-face fracture diameters. Similar front-face failure and strain distribution relationshipsbased on the projectile nose shape were observed for normal and fiber-reinforced concrete although the rear-face tensile strain and scabbing weresignificantly reduced by the fiber reinforcement. In addition, a direct relationship was confirmed between the penetration depth based on the projectilenose shape and the tensile strain on the rear face. Thus the impact strain behavior is required to predict the scabbing behavior with penetration depth.
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