As buildings are growing higher and larger, more composite structures have been used. However, the steel member used for composite structure tends to rapidly lose its strength at elevated temperatures. For this reason, it is required to apply a fire resistance mechanism, but it is difficult to implement because of the cost and technical limitations in the case of fire-resistant paint. In case of fireproof spray coat, scattering phenomena, poor work conditions for wet application, and construction delay are the main challenges to be addressed. In this study, a full-scale fire resistance test of non-fire resistant cladding column was conducted in accordance with KS F 2257-7. According to the test results, the specimens CC-01, CC-02, and CC-03 failed to meet the requirements for a 3-hour fire resistance rating because of the joint deformation and less cover thickness, while CC-04, CC-05, and CC-06 with increased thickness and reinforced joints satisfied the requirements for a 3-hour fire resistance rating.
When a fire is completely developed, it expands from the inside of the building to the outside through any opening (s) and spreads to the building exterior, resulting in the loss of many lives and properties. As fire safety performance is affected by the construction methods applied and components of building insulation and finishing materials, this study compared and analyzed the internal and external fire spread performances according to the performance of the insulation material (polyurethane) and types of finishing materials. In this study, a cone calorimeter test was conducted according to the KS F ISO 5660-1 standard, and a full-scale mock-up test of exterior wall composite finishing materials was conducted based on the KS F 8414 standard. Consequently, the total heat release (THR) of polyurethane for 10 min after the start of heating was 5.51 MJ/m<sup>2</sup>. No vertical fire spread occurred in both test specimens to which a stone panel and an aluminum sheet panel were applied; however, the fire spread to the cavity, causing a temperature rise.
In this study, the physical properties of the material were tested to ensure the applicability of the filling-type fireproof construction method when using spraying materials, and the changes in the material in different filling locations were evaluated. The filler, ET-1013 mixture without admixture, showed proper fluidity. When using the lower filling method, cracking and sagging occurred over time because of the increase in internal pressure. At the same time, cracking and deflection did not occur in the case of the upper filling method. The filling tests were performed using manufactured 1,000 and 3,000 mm columns. In the case of the lower filling method, cladding steel plates of the column underwent out-of-plane buckling, and the material separation occurred.
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