Fire Science and Engineering (한국화재소방학회논문지)

Korean Institute of Fire Science and Engineering (한국화재소방학회)
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A Study on the Properties of SM 400 for Evaluation of Structural Stability at High Temperature

고온 시의 구조내력 평가를 위한 SM 400강재의 고온 특성 평가 연구

  • Kwon, In-Kyu (Department of Fire Protection Engineering, Kangwon National University)
  • Received : 2013.05.10
  • Accepted : 2013.08.09
  • Published : 2013.08.31
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Abstract

Recently, the risk of fire outbreak is going up because of newly developed combustible materials are intended to apply more. Especially the steel framed structure can lose its load-bearing capacity when it is exposed to higher temperature condition such as a fire. So the pre-evaluation of fire resistance of the structure is very essential that the mechanical properties of yield strength and elastic modulus and thermal properties such as conductivity and linear expansion be required. To get the databases for SM 400 or welding structural steels at high temperature, various temperature conditions were used for deriving the yield strength, elastic modulus, linear expansion, and conductivity and the results were compared to those of SS 400, ordinary structural steel, respectively.

건축물에서의 화재 발생은 인명피해, 구조물 피해 등 재해적 요소를 많이 포함하고 있으며, 가연물의 증가에 따라 화재 발생빈도수와 피해 규모는 점차 증대하는 추세이다. 특히 강재로 구성되는 기둥부재와 보부재의 고온 시 내력의 급격한 감소는 구조물의 붕괴와 같은 매우 위험한 상황에 도달될 수 있으므로 화재 시 강구조 건축물의 구조 안전성 확보를 위해서는 적용 강재의 신뢰성 있는 고온 물성자료가 매우 중요하다. 따라서 본 연구에서는 강구조 건축물에서 많이 활용되는 용접구조용 강재인 SM 400강재를 대상으로 고온 시 항복강도, 탄성계수를 측정하여 내력평가에 활용할 수 있는 실험식을 제시하고, 화재 시의 온도평가와 응력 계산에 요구되는 열전도율과 열팽창계수 등의 열적 특성의 자료를 제시한다. 또한 일반 구조용 강재인 SS 400과의 고온 특성을 비교, 평가함으로써 고온에서의 내력 특성을 확인한다.

Keywords

References

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