Variation of time-dependent convection beat transfer coefficients in beat transfer analysis at various initial beating rates of tunnel fire scenarios

요소제거모델을 활용한 열전달해석에서 터널 화재이력곡선의 초기가열구배에 따른 대류열전달계수의 변화

  • 최순욱 (한국건설기술연구원 기반시설연구본부 지반연구실, 연세대학교 사회환경시스템공학부 대학원) ;
  • 장수호 (한국건설기술연구원 기반시설연구본부 지반연구실) ;
  • 이춘환 (연세대학교 사회환경시스템공학부) ;
  • 안성율 (사이텍이앤씨)
  • Received : 2010.02.22
  • Accepted : 2010.04.26
  • Published : 2010.05.31

Abstract

The initial heating rate is well known as one of the most influencing factors on the occurrence of spalling and the loss of strength in concrete after fire initiation. In this study, a series of fire tests were carried out at different initial heating rates to find out its effects on the deterioration of tunnel structural members. Heat transfer analyses combined with an element elimination model were also carried out to verify its applicability in the same conditions as the fire tests. Moreover, the convection heat transfer coefficients compatible with fire test results were derived from parametric studies. In this course, their time-dependent variations were also analyzed at different initial heating rates. Finally, a numerical formula to estimate the heat transfer coefficients at the various initial heating rates was proposed by the interpolation of the results of numerical analyses.

Acknowledgement

Grant : 지하공간 환경조성 및 방재기술 개발 - 지하구조물 재해손상 대응기술 개발

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