표준화재에 노출된 무피복 메가 CFT 기둥의 온도분포 및 강도 예측|RISS 상세보기

다국어 초록 (Multilingual Abstract)

In this study, three representative methods that can be used to predict the temperature distribution of unprotected CFT columns under standard fire were evaluated based on recent large-size testing data. Among the three methods evaluated, Koo-Lee-Ahn’s method (2013) was most versatile and provided most satisfactory predictions, with its prediction accuracy being improved as the fire exposure time increased. For the standard fire exposure of 180 min, the plastic compressive strength of unprotected square CFT columns with a width of 700 mm, 1,000 mm, and 1,400 mm was calculated to retain 39 %, 44 %, and 47 % of respective cold column strength. The reduction of the plastic compressive strength due to inelastic buckling was just moderate (about 10 %) for a slenderness of L/D = 5.0 and an effective buckling length factor of K = 1.0, and almost negligible under the same condition with K = 0.5. With adding 6 % fire reinforcement, the allowable load ratio was increased to around 0.60, thus indicating that unprotected fire design of mega CFT columns is practically feasible. The results of this study can be conveniently used when implementing the performance based fire design of unprotected CFT columns under the framework of simple calculation method.

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참고문헌 (Reference)

1 구철회, "화재 시 무피복 CFT 기둥의 축강도 평가를 위한단면온도분포 예측기법의 개발" 한국강구조학회 25 (25): 587-599, 2013

2 안재권, "재하가열시험에 의한 무내화피복 콘크리트충전 각형강관기둥의 내화성능평가" 한국강구조학회 26 (26): 323-334, 2014

3 김선희, "비재하 가열실험을 통한 이중강관 CFT기둥의 잔존강도 평가연구" 한국강구조학회 24 (24): 81-89, 2012

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6 Korean Agency for Technology and Standards, "Methods of Fire Resistance Test for Elements of Building Construction - General Requirements (KS F 2257-1:2019)"

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