Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Evaluation of Ballistic Resistance Performance by Thickness and Proportion of Magnetic Aggregate of Concrete

콘크리트 두께와 자철광 함량에 따른 방탄 성능 평가

  • Received : 2019.09.16
  • Accepted : 2020.01.31
  • Published : 2020.02.20
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Abstract

The main purpose of protective facility for small military unit is to provide the protection of not all the weapons system but the near-miss bullet in Korean army. In particular about the small caliber bullets, especially KM80 in Korea, there were many studies that both of the experiential and structural design methods dose not reflect enough the military threat. For that reason, a new equation to calculate effective anti-piercing depths for RC slabs against small caliber bullets is proposed in earlier research with actual shooting test. But, the test only considers the strength of concrete without the thickness of concrete, types of aggregate, the angle of yaw of bullet, high-strength concrete, etc. Therefore, this study evaluated the ballistic resistance performance by thickness and proportion of magnetic aggregate of concrete. As a result, we identified two major statistical estimations that the error of piercing depth by the angle of yaw of bullet could be cancelled by barrage and the thickness and proportion of magnetic aggregate of concrete dose not effect on the protection ability of concrete structure.

소부대 방호시설의 주된 목적은 적의 모든 무기체계에 대한 완벽한 방호가 아니며, 한국군의 경우, 지근탄에 대한 방호를 적용하고 있다. 특히 소구경 탄자의 경우, KM 80탄을 기준으로 설정하고 있는데, 이에 대한 경험적 설계방법과 구조공학적 설계방법 모두 현실을 제대로 반영하지 못한다는 선행연구들이 있다. 이에 실사격 실험을 수행한 선행연구에서는 콘크리트 슬래브의 소구경 탄자에 대한 관입저항력 계산식을 제안한 바 있다. 그러나, 해당 실험에서는 콘크리트 강도만을 변수로 설정하였고 콘크리트의의 두께, 굵은골재의 종류, 탄자의 편주각, 고강도 콘크리트 등에 대한 변수가 고려되지 않았다. 따라서 본 연구에서는 콘크리트의 두께와 자철광의 함량에 따른 방탄성능을 평가하였다. 그 결과 탄자의 편주각에 의한 오차를 연발사격에 의해 상쇄시킬 수 있다는 것과 자철광의 함량과 콘크리트 두께는 방호성능 향상에 영향을 주지 않는다는 것을 통계적으로 확인하였다.

Keywords

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