한국강구조학회 논문집 (Journal of Korean Society of Steel Construction)

  • 제25권6호
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  • Pages.587-599
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  • 2013
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  • 1226-363X(pISSN)
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  • 2287-4054(eISSN)
한국강구조학회 (Korean Society of Steel Construction)
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화재 시 무피복 CFT 기둥의 축강도 평가를 위한 단면온도분포 예측기법의 개발

Prediction of Temperature Distribution to Evaluate Axial Strength of Unprotected Concrete-filled Steel Tubular Columns under Fire

  • Koo, Cheol Hoe (Department of Building and Housing, Dongbu Corporation) ;
  • Lee, Cheol Ho (Department of Architecture and Architectural Engineering, Seoul National University) ;
  • Ahn, Jae Kwon (Department of Architecture and Architectural Engineering, Seoul National University)
  • 투고 : 2013.06.05
  • 심사 : 2013.10.01
  • 발행 : 2013.12.27
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초록

본 연구에서는 EC4의 내화설계 관점에서 표준화재하의 무피복 콘크리트충전강관기둥의 내화성능을 해석적으로 예측하는 개선된 방안을 제시하고자 하였다. Lawson 등이 제안한 콘크리트충전강관기둥에 대한 단면온도평가식의 한계를 분석하고, 기존 실험결과와 유한요소 열전달해석을 바탕으로 콘크리트충전강관기둥의 단면온도분포 예측식을 새로이 제안하였다. 본 연구에서 제안한 온도분포 예측식과 EC4의 내화설계법을 이용하여 예측한 콘크리트충전강관기둥의 축강도는 기존 설계법과 비교하여 더욱 정확하고 설계목적에 합당하다고 판단된다. 본 연구의 결과는 무피복 콘크리트충전강관기둥의 내화설계 및 성능평가에 매우 편리하게 활용될 수 있다.

A simple but accurate analytical method to evaluate the fire resistance of unprotected concrete filled tubular (CFT) columns under standard fire condition is proposed based on the fire design framework of EC4. To this end, the accuracy of the current tabulation method for the temperature prediction proposed by Lawson et al. was first critically evaluated, and a new prediction equation for the temperature gradient across the CFT section was then proposed based on available test and finite element analysis results. Overall, the axial strength predicted by using the proposed equation under the general fire design framework of EC4 was more accurate than that based on existing methods and appeared reasonable for design purposes. The results of this study are directly usable for the more rational fire analysis and design of unprotected CFT columns.

키워드

참고문헌

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피인용 문헌

  1. An Experimental Study of Improving Fire Performance with Steel-fibers for Internally Anchored Square Composite Columns vol.26, pp.6, 2014, https://doi.org/10.7781/kjoss.2014.26.6.499
  2. 강섬유 콘크리트 혼입율에 따른 내부앵커형 콘크리트 충전기둥 내화성능에 관한 해석적 연구 vol.28, pp.1, 2013, https://doi.org/10.7781/kjoss.2016.28.1.023
  3. Experimental Study on the Fire Resistance of Steel-Reinforced Concrete Column in Fire According to Load Ratio vol.31, pp.6, 2013, https://doi.org/10.7781/kjoss.2019.31.6.459
  4. Prediction of Temperature Distribution and Strength of Unprotected Mega CFT Columns Exposed to Standard Fire vol.33, pp.1, 2013, https://doi.org/10.7781/kjoss.2021.33.1.001