Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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Insulation Design for Circular Spacers of Steel-Polymer Prefabricated Floor under Fire

화재에 노출된 강폴리머 조립식 바닥의 원형 스페이서 차열 설계

  • 박민재 (고려대 건축사회환경공학부) ;
  • 민정기 (한국건설생활환경시험연구원 실화재센터)
  • Received : 2021.07.18
  • Accepted : 2021.08.27
  • Published : 2021.10.30
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Abstract

Steel-Polymer prefabricated floor system that contained infilled polymers between the shallow top and bottom steel plates was developed to apply to steel structures. The thickness of the floor system mainly has a range from 25 mm to 70 mm. Despite the shallow thickness, the floor system has great structural performance, such as bending capacity, floor vibration performance. However, the fire resistance performance of the system needed to be improved to apply to actual buildings without fire-proofing materials. With the development of the polymers adding an additive, the fire resistance performance of the system was significantly improved, and studies about the structural fire behavior of the floor system were actively conducted with experimental and numerical approaches. Nevertheless, the behavior of circular spacers that had a role in enhancing out-of-plane buckling loads and ductility under large deformations and taking advantage in the manufacturing process has not been investigated. Therefore, the thermal behavior of circular spacers under fire conditions was studied with simplified numerical methods. And, with transient heat transfer analysis including nonlinear thermal properties of steel and polymers, nonlinear thermal contact conductance of the contact area between steel and polymers, the temperature changes of unheated surfaces where the spacers were installed at or not were obtained under fire conditions. Finally, the relation equation was proposed to calculate the temperature changes according to various specifications of circular spacers. Using this proposed equation, the thermal insulation design for the spacers of steel-polymer prefabricated were carried out at the end of this paper.

Keywords

Acknowledgement

이 연구는 한국연구재단 중견연구자지원 사업의 연구비 지원에 의한 결과의 일부임. 과제번호:NRF-2020R1A2C3005687

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