Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Assessment of structural fire resistance of a fire-proofed immersed tunnel under tunnel fire scenarios

화재시나리오별 침매터널 구조물의 화재저항성 평가

  • 최순욱 (한국건설기술연구원 기반시설연구본부 지반연구실) ;
  • 장수호 (한국건설기술연구원 기반시설연구본부 지반연구실) ;
  • 김흥열 (한국건설기술연구원 건설품질정책본부 화재안전연구실) ;
  • 조봉현 (대우건설 GK침매터널현장)
  • Received : 2010.10.08
  • Accepted : 2010.11.22
  • Published : 2010.11.30

Abstract

In this study, fire resistance of a fireproof material sprayed upon an immersed tunnel was experimentally evaluated under $HC_{inc}$ and IS0834(duration of 4 hours) fire scenarios. Under $HC_{inc}$ fire scenario, the maximum inner temperatures of a concrete specimen at the depth of 0, 25 and 50 mm from the interface between the structure and the fire-proofing layer were $311^{\circ}C$, $194^{\circ}C$ and $142^{\circ}C$ respectively. Similarly, the corresponding maximum temperatures under IS0834 fire scenario were $332^{\circ}C$, $222^{\circ}C$ and $179^{\circ}C$ respectively. From the results, it was revealed that the two different fire scenarios assumed in this study have almost the same fire capacity as each other in the maximum temperature concept. In addition, a structural analysis of the immersed tunnel under $HC_{inc}$ fire scenario was carried out to verify the effects of the fireproof material on its structural stability. Material loss and deterioration of a concrete specimen without any fire-proofing measure was also experimentally evaluated to obtain input parameters for the structural analysis under such a severe fire scenario. From the results, it was confirmed that the application of fireproof measures to the immersed tunnel is essential for its structural stability even under a severe fire scenario.

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