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.

References

  1. 지케이해상도로주식회사(2006), 구조해석보고서 일부(함체 E12-E14 횡방향 해석 부분).
  2. 장수호, 최순욱, 권종욱, 김상환, 배규진(2007), 화재 후 터널구조물 시공재료의 역학적 특성변화, 한국터널공학회논문집, 제9권, 제2호, pp. 157-169 .
  3. 한국시설안전공단(2003), 대구지하철 1호선 중앙로역 정밀안전진단보고서.
  4. Buchanan, A. H. (2002), Structural Design for Fire Safety, WILEY.
  5. Caner, A., Zlatanic, S. and Munfah, N. (2005), "Quantitative assessment of structural fire endurance of concrete and shotcrete tunnel liners", Underground Space Use: Analysis of the Past and Lessons for the Future-Erdem & Solak (eds), pp. 585-590.
  6. ITA WG-6 (2004), Guidelines for structural fire resistance for road tunnels.
  7. Khoury, G.A. (2000), "Effect of fire on concrete and concrete structures", Proc. Struct. Engng. Mater., pp. 429-447.
  8. Marche, R., Lapierre, J. Y., Pozzi, V. and Mayu, P. (2002), "Mont Blanc Tunnel - a method to evaluate damage by fire to the concrete shell", Proc. of ITA-AITES, TSI2A.4.
  9. Matsuo, Y., Mizobe, A, and Kiyomiya, O. (2005), "Study on anti-fire panel for vehicle fore in immersed tunnel", Underground Space Use: Analysis of the Past and Lessons for the Future-Erdem & Solak (eds), pp. 1005-1011.
  10. Narendranathan, N., Chua, T. J. (1995), "Assessment and repair of fire damaged concrete structures", 20th Conference on Our World in Concrete & Structures, August, 23-25, Singapore.
  11. TNO (1998), Fire Protection for Tunnels (Part 1: Fire Test Procedure), 1998-CVB-R1161 (rev. 1).