| Title |
Insulation Design for Circular Spacers of Steel-Polymer Prefabricated Floor under Fire |
| Authors |
박민재(Park, Min Jae) ; 민정기(Min, Jeong-Ki) |
| DOI |
https://doi.org/10.5659/JAIK.2021.37.10.227 |
| Keywords |
Steel-Polymer Prefabricated Floor; Fire Resistance; Thermal Insulation; Circular Spacers; Heat Transfer Analysis |
| 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. |