A Study on the Determination of Required Fire Protection Thickness Considering Steel Section Shape

강재단면형상을 고려한 소요 내화피복 두께 산정에 관한 연구

  • Kim, Hae-Soo (Department of Architecture, Dong-Eui Institute of Technology) ;
  • Kang, Jong (Department of Architectural Engineering, Tongmyong University)
  • 김해수 (동의과학대학교 건축과) ;
  • 강종 (동명대학교 건축공학과)
  • Received : 2011.11.18
  • Accepted : 2011.12.13
  • Published : 2011.12.31


Surface area of the steel member exposed to fire differs according to type and size of the section and the kind of the member, which shows a big difference in the temperature rise of the steel by fire. The section factor ($H_p$/A) is determined by factors such as type, size, and member of the steel and type of the fire protection material, and it is the criteria in determining thickness of the fire protection material. This study showed that the size of the steel increase regardless of the steel type, the section factor decrease. In the results on fire protection thickness of the steel according to the section factor, the efficiency of 1 hour fire protection was lower from 30 to 50% than the criteria. And there is the member, which have the thickness lower the minimum 27% in 2 hour fire protection, but it generally approached in the criteria. In case of H-shape steel, the efficiency of 3 hour fire protection was suitable for the criteria, but rectangular hollow steel section and circular hollow steel section were higher (5.0-17.5%) than the criteria.


Fire Resistance;Section Factor;Fire Protection;Fire Duration Time;Types of Steel


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