An Evaluation on Fire Resistance Performances of CFT Columns According to Conditions Exposed to Fire

Lee, Deuck Hang; Lee, Jung Min; Cho, Bum Yean; Kim, Kang Su

Journal of the Korean Society of Hazard Mitigation 2015;15(3):155-160.
Published online June 30, 2015.

화재노출조건에 따른 무피복 각형 CFT 기둥의 내화성능평가

강현, 이득행, 이정민, 조범연, 김강수

An Evaluation on Fire Resistance Performances of CFT Columns According to Conditions Exposed to Fire

Deuck Hang Lee, Jung Min Lee, Bum Yean Cho, Kang Su Kim

Abstract

In this study, nonlinear finite element analyses were carried out on the squared concrete filled tube(CFT) columns according to the number of faces exposed to fire. The analysis results were compared to the test results obtained from literature, by which the accuracy of the nonlinear finite element analysis approach has been verified, and then, the parametric study has been conducted. As the number of faces exposed to fire increased, the fire performance of the squared CFT columns subjected to axial force only was degraded. It is, however, considered that their performance could be different when subjected to eccentric axial force, which would require further study in this regard.

Key Words: Fire; Fire resistance; CFT; Column; Composite; Compartment fire

요지

이 연구에서는 화재노출 면에 따른 무피복 각형 콘크리트 충전강관(Concrete Filled Tube)기둥 부재의 화재거동을 비선형 유한요소 해석을 통하여 평가하였다. 기존연구에서 실험된 실물 CFT 기둥의 실험결과에 대한 해석결과와의 비교를 통하여 비선형 유한요소 해석모델의 신뢰성을 검증한 후, 화재노출 면에 따른 변수분석을 수행하였다. 중심축력을 받는 무피복 각형 CFT 기둥은 화재노출 면이 많을수록 내화성능이 저하되는 것으로 나타났으며, 추후 편심축력의 영향을 고려한 추가적인 연구가 필요할 것으로 판단된다.

핵심용어: 화재; 화재저항; 기둥; 합성; 구획화재