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Fire Sci. Eng. > Volume 31(2); 2017 > Article
Fire Science and Engineering 2017;31(2):9-16.
DOI: https://doi.org/10.7731/KIFSE.2017.31.2.009    Published online April 30, 2017.
단면형상 및 크기에 따른 콘크리트 충전강관(CFT) 기둥의 화재거동에 관한 실험적 연구
조범연, 김흥열, 권기석, 양승조
1한국건설기술연구원 화재안전연구소
2한국건설기술연구원 화재안전연구소
3한국건설기술연구원 화재안전연구소
4한국건설기술연구원 화재안전연구소
Experimental Study of the Fire Behavior of CFT Columns in Relation to the Sectional Shape & Size
Cho Bum-Yean, Kim Heung-Youl, Kwon Ki-Seok, Yang Seung-Cho
1Fire Research Institute, Korea Institute of Civil Engineering and Building Technology
2Fire Research Institute, Korea Institute of Civil Engineering and Building Technology
3Fire Research Institute, Korea Institute of Civil Engineering and Building Technology
4Fire Research Institute, Korea Institute of Civil Engineering and Building Technology
요약
본 연구는 단면형태 및 단면크기에 따라 무피복 및 무용접 조건에서 CFT기둥의 내화성능을 평가하기 위하여 내화실험을 실시하였다. 실험결과, 슬롯형 CFT기둥(${square}500$)은 무피복 조건에서 180분 이상의 내화성능을 발휘하였다. 슬롯형 CFT기둥(${square}300$)은 무피복 조건에서 125분의 내화성능을 발휘하였고, 이때 변형률을 분석한 결과 슬롯형 CFT 기둥이 용접형 CFT기둥에 비해 연성파괴를 하는 것으로 나타났다. 또한 용접형 CFT기둥이 내화성능을 상실한 시점에서 중심부 온도는 슬롯형 CFT기둥에 비해 높게 나타났다. 따라서 슬롯접합이 콘크리트 내부온도에 미치는 영향은 크지 않은 것으로 판단된다.
Abstract
In this study, fire resistance tests were conducted to evaluate the fire resistance performance of unprotected and non-welded CFT columns in relation to the shape and size of cross-sections. Unprotected slot-type CFT columns which were ${square}300$ and ${square}500$ in dimensions resisted fire for 125 minutes and more than 180 minutes, respectively. Strain analysis showed that slot-type CFT columns were more ductile than welded CFT columns. The temperatures of central parts measured when welded CFT columns and slot-type CFT columns had lost fire resistance performance were higher in the former than the latter. Therefore, slot connection does not a great influence on the temperatures inside the concrete.
Key Words: Concrete Filled Tube (CFT), Slot, Fire Resistance, High Strength Concrete, Column


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