Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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FE Analysis on the Structural Behavior of the Single-Leaf Blast-Resistant Door According to Design Parameter Variation

설계변수에 따른 편개형 방폭문의 구조거동 유한요소해석

  • Shin, Hyun-Seop (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Won-Woo (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Gi-Joon (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Nam-Kon (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Moon, Jae-Heum (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Sung-Wook (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology)
  • 신현섭 (한국건설기술연구원 인프라안전연구본부) ;
  • 김원우 (한국건설기술연구원 인프라안전연구본부) ;
  • 박기준 (한국건설기술연구원 인프라안전연구본부) ;
  • 이남곤 (한국건설기술연구원 인프라안전연구본부) ;
  • 문재흠 (한국건설기술연구원 인프라안전연구본부) ;
  • 김성욱 (한국건설기술연구원 인프라안전연구본부)
  • Received : 2019.09.30
  • Accepted : 2019.11.01
  • Published : 2019.11.30
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Abstract

Steel-concrete single-leaf blast-resistant doors are protective structures consisting of a steel box and reinforced concrete slab. By the domestic blast-resistant doors, the structure is not designed efficiently because few studies have examined the effects of variables, such as the blast pressure, rebar ratio, and steel plate thickness on the structural behavior. In this study, the structural behavior of the doors was analyzed using the FE method, and the support rotation and ductility ratio used to classify the structural performance were reviewed. The results showed that the deflection changes more significantly when the plate thickness increases than when the rebar spacing is a variable. This is because the strain energy absorbed by the door is reduced considerably when the plate thickness increases, and as a result, the maximum deflection becomes smaller. According to a comparison of the calculated values of the support rotation and the ductility ratio, the structural performance of the doors could be classified based on the support rotation of one degree and ductility ratio of three. On the other hand, more explosion tests and analytical studies will be needed to classify the damage level.

강-콘크리트 편개형 방폭문은 외피 구조로서의 강재 박스와 내부의 철근콘크리트 슬래브 부재로 구성된 방호 구조물이다. 국내 방폭문 설계의 경우 폭압의 크기, 철근량 및 강박스의 강판두께와 같은 설계변수의 변화가 구조거동에 미치는 영향에 대해서 연구결과가 많지 않은 관계로 방폭문의 구조가 효율적으로 설계되지 않고 있다. 본 연구에서는 배근 간격 및 강재 박스의 강판 두께, 하중조건 등을 변수로 하여 유한요소 해석에 의한 구조거동 특성을 분석하였으며, 또한 방폭문의 구조성능을 구분하기 위해 산정되는 회전연성도 및 변위연성도를 재검토하고자 하였다. 유한요소해석 결과에 따르면, 배근 간격을 변수로 할 때 보다 강재 박스의 강판 두께가 변할 경우가 처짐과 같은 구조거동에 있어서 더 큰 변화를 나타내고 있음을 알 수 있었다. 이와 같은 결과는 외피의 강재 박스의 강판 두께를 증가시킬 때 방폭문에 흡수된 변형 에너지가 더 큰 폭으로 감소하고, 결과적으로 전체적인 구조거동으로서의 처짐이 더 작게 발생하기 때문인 것으로 분석되었다. 또한, 방폭문의 구조성능을 구분하기 위한 방법으로서 회전 연성도 및 변위 연성도를 비교한 결과, 해석 대상 방폭문들의 성능은 회전 연성도 1도 및 변위 연성도 3을 기준으로 분류될 수 있었다. 폭발압에 대한 방폭문의 손상 수준을 분류하기 위해서는 향후 다수의 폭발시험 및 해석적 연구가 필요할 것으로 사료된다.

Keywords

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