Fire Resistance Evaluation of Fabricated Slim Floor Beams with an Air Layer Applied with Low-E Film according to Load Ratio

An analytical investigation was conducted into the fire resistance performance of fabricated slim floor beams (FSFBs) according to the load ratio. The goal was to establish a numerical standard for assessing FSFB members’ performance when exposed to fire during structural calculations or design. Unlike other types of slim floor beams, FSFBs have superior fire resistance due to the presence of an air layer in their manufacturing process. In addition, the application of Low-E film reduces heat transfer in this air layer, thereby improving FSFBs’ fire resistance performance. To address these factors, a finite element model was employed, and variable analysis was conducted. This model’s validity was established by comparing its results with tests and analyses from other research papers. Subsequently, the analysis was performed with the load ratio and the application of Low-E film as variables, using a verification model to ensure its accuracy. Based on the analysis results, the fire resistance performance of FSFBs was compared under various conditions, leading to the derivation of a fire resistance performance regression equation for fire resistance performance, with the load ratio as the independent variable. This regression equation enables the calculation of the load ratio for each FSFB size and usage scenario, depending on whether or not Low-E film is applied.