한국전산구조공학회논문집 (Journal of the Computational Structural Engineering Institute of Korea)

  • 제33권5호
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  • Pages.339-349
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  • 2020
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  • 1229-3059(pISSN)
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  • 2287-2302(eISSN)
한국전산구조공학회 (Computational Structural Engineering Institute of Korea)
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지지조건 변화에 따른 양개형 방폭문의 구조거동 유한요소해석

FE Analysis on the Structural Behavior of a Double-Leaf Blast-Resistant Door According to the Support Conditions

  • 신현섭 (한국건설기술연구원 인프라안전연구본부) ;
  • 김성욱 (한국건설기술연구원 인프라안전연구본부) ;
  • 문재흠 (한국건설기술연구원 인프라안전연구본부) ;
  • 김원이 (한국건설기술연구원 인프라안전연구본부)
  • Shin, Hyun-Seop (Dep. Infrastruct. Saf. Res., Korea Institute of Civil Engineering and Building Technology (KICT)) ;
  • Kim, Sung-Wook (Dep. Infrastruct. Saf. Res., Korea Institute of Civil Engineering and Building Technology (KICT)) ;
  • Moon, Jae-Heum (Dep. Infrastruct. Saf. Res., Korea Institute of Civil Engineering and Building Technology (KICT)) ;
  • Kim, Won-Woo (Dep. Infrastruct. Saf. Res., Korea Institute of Civil Engineering and Building Technology (KICT))
  • 투고 : 2020.09.14
  • 심사 : 2020.09.23
  • 발행 : 2020.10.31
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초록

외피 구조로서의 강박스와 내부의 철근콘크리트 슬래브로 구성되는 양개형 방폭문은 방호 및 대피 구조물의 출입구에 설치되는 구조체이다. 방폭문과 그 후면의 벽체 사이에는 일정의 설치 간격이 존재하게 되는데, 이로 인한 지지조건 및 구조거동의 변화는 방폭 해석 및 설계에 적절히 고려되지 않고 있다. 본 연구에서는 설치 간격에 의한 지지조건 및 폭압의 변화에 따른 방폭문의 구조응답 및 파괴거동을 유한요소 해석방법으로 비교·분석하였다. 해석 결과에 따르면, 설치 간격 및 폭압의 변화는 방폭문의 최대 처짐 및 영구 처짐과 같은 처짐 거동에 영향을 미치며, 설치 간격이 크고 작음에 따라 방폭문과 벽체의 충돌 접촉 정도 및 이에 의한 충격력이 크게 변화하는 것으로 나타났다. 또한, 방폭문에 작용하는 이와 같은 충격력의 변화는 슬래브의 전단파괴와 같은 파괴거동에 영향을 미치는 주요 요인으로 분석되었다. 설치간격 10mm 미만의 방폭문은 전단파괴에 취약해지고, 15mm 내외 수준인 경우가 휨성능 발현에 비교적 더 적합한 것으로 나타났다. 본 연구에서는 설치 간격 및 폭압과 같이 기본적인 조건의 변화에 한해서 비교 해석을 하였다. 향후, 부재 재원 및 강도변화, 전단설계 여부 등 다양한 변수에 따른 구조거동 변화에 대해 실험적 및 해석적 연구가 필요하다.

Double-leaf blast-resistant doors consisting of steel box and slab are application-specific structures installed at the entrances of protective facilities. In these structural systems, certain spacing is provided between the door and wall. However, variation in the boundary condition and structural behavior due to this spacing are not properly considered in the explosion analysis and design. In this study, the structural response and failure behavior based on two variables such as the spacing and blast pressure were analyzed using the finite element method. The results revealed that the two variables affected the overall structural behavior such as the maximum and permanent deflections. The degree of contact due to collision between the door and wall and the impact force applied to the door varied according to the spacing. Hence, the shear-failure behavior of the concrete slab was affected by this impact force. Doors with spacing of less than 10 mm were vulnerable to shear failure, and the case of approximately 15-mm spacing was more reasonable for increasing the flexural performance. For further study, tests and numerical research on the structural behavior are needed by considering other variables such as specifications of the structural members and details of the slab shear design.

키워드

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