Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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A Study on the Development of Force Limiting Devices(FLD) which Induce Yielding before Elastic Buckling

좌굴전 항복유도 장치(FLD) 개발에 관한 연구

  • Kim, Cheol Hwan (School of Architecture and Civil Engineering, Kyungpook National University) ;
  • Chae, Won Tak (School of Architectural Engineering, Kyungpook National University) ;
  • Oh, Young Suk (School of Architectural Engineering, Daejeon University) ;
  • Kim, Chae Yeong (School of Architectural Engineering, Daejeon University)
  • 김철환 (경북대학교 건축토목공학부) ;
  • 채원탁 (경북대학교 건축도시환경공학부) ;
  • 오영석 (대전대학교 건축공학과) ;
  • 김채영 (대전대학교 건축공학과)
  • Received : 2013.04.16
  • Accepted : 2013.06.03
  • Published : 2013.06.27
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Abstract

The steel members are applied to high rise building since they have high strength compare to the concrete member. On the other hand, the elastic buckling is likely to occur in steel member because of their small section. When the elastic buckling occur, the steel structure lose a load carrying capacity. The steel frame would be unstable due to a rapid decline in strength by buckling. The purpose of this study is the development of FLD(Force Limiting Device) to prevent a elastic buckling for a slender member. Further, the behavior of steel structures with FLD would be stable by high energy absorption capacity. The proposed type of FLD is the type of out-of-plane resistance. In this study, member test and FEM analysis for proposed type were performed. The test parameters are thickness and gradient angle of out-of-plane plate. The proposed type may be effective method for FLD.

세장한 부재에 압축력이 작용할 때, 부재는 탄성좌굴이 발생하게 되어 급격히 내하력을 상실하고 파괴에 도달하게 된다. 이러한 현상으로 인한 부재의 파괴는 종국적으로 구조체에 위해를 가하게 되어 붕괴원인이 되기도 한다. 본 연구에서는 세장한 부재에 압축력이 작용할 경우 부재가 탄성좌굴이 발생하기 이전에 항복하도록 유도하는 장치(응력제한장치)를 개발하는 것을 목적으로 하고 있다. 특히, 본 논문에서는 응력제한장치로서 면외저항판 방식을 제안하고 실험과 유한요소 해석을 수행하였다. 실험의 변수는 면외저항판의 두께 및 저항판의 경사도이다. 실험 및 해석결과 면외저항판 실험체는 항복후 소성영역에서 내력의 큰 저하없이 안정적인 거동을 나타내고 있어 응력제한방식으로서 유효성이 확인되었다.

Keywords

References

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