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

화재 시 무피복 CFT 기둥의 축강도 평가를 위한 단면온도분포 예측기법의 개발

  • 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)
  • Received : 2013.06.05
  • Accepted : 2013.10.01
  • Published : 2013.12.27

Abstract

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.

Acknowledgement

Supported by : 한국연구재단

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