Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Progressive Collapse Analysis of Reinforced Concrete Core Structure Subjected to Internal Blast Loading

내부 폭발하중을 받는 철근콘크리트 코어의 연쇄붕괴 해석

  • Kim, Han-Soo (Dept. of Architectural Engineering, Konkuk University) ;
  • Ahn, Jae-Gyun (Dept. of Architectural Engineering, Konkuk University) ;
  • Ahn, Hyo-Seong (Dept. of Architectural Engineering, Konkuk University)
  • 김한수 (건국대학교 건축공학과) ;
  • 안재균 (건국대학교 건축공학과) ;
  • 안효승 (건국대학교 건축공학과)
  • Received : 2014.04.21
  • Accepted : 2014.10.20
  • Published : 2014.12.31
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Abstract

In this paper, internal blast effect of reinforced concrete core structure were investigated using Ansys Autodyn, which is a specialized hydrocode for the analysis of explosion and impact. It is expected that internal blast case can give additional damage to the structure because it causes rebound of blast loads. Therefore, in this paper, the hazard of internal blast effect is demonstrated using UFC 3-340-02 criteria. In addition, analysis result of Autodyn, experimental result regarding rebound of blast load, and example of UFC 340-02 are compared to verify that Autodyn can analyze internal blast effect properly. Furthermore, progressive collapse mechanism of core structure which is one of the most important parts in high rise buildings is also analyzed using Autodyn. When internal blasts are loaded to core structure, the core structure is mostly damaged on its corner and front part of core wall from explosives. Therefore, if the damaged parts of core wall are demolished, progressive collapse of the core structure can be initiated.

본 논문에서는 철근콘크리트 코어 구조물의 내부폭발 효과를 폭발이나 충격해석에 특화되어 있는 하이드로코드인 Ansys Autodyn을 이용하여 조사하였다. 내부폭발의 경우 폭발하중의 반사효과로 인해 더욱 큰 파괴를 일으킬 수 있다. 그러므로, 본 논문에서는 UFC 3-340-02 를 사용하여 내부 폭발현상을 입증하였다. 추가적으로 Autodyn을 사용한 해석에 관하여 UFC에서 예제로 제시하는 폭발하중의 반사에 관한 실험 결과를 비교하여 Autodyn이 내부폭발 효과를 해석하는데 적합함을 증명하였다. 나아가, 초고층빌딩에서 가장 중요한 부분 중의 하나의 코어 구조의 붕괴메커니즘을 Autodyn을 사용하여 해석하였다. 내부폭발이 코어에 충격을 가할 때, 코어는 모서리와 폭발 정면 부분이 대부분 피해를 입었다. 그러므로, 코어 벽체가 피해를 입게 된다면 코어 구조물의 연쇄붕괴가 발생할 수 있다.

Keywords

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