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The full‐scale façade standard test is widely employed as a comprehensive method to assess the façade fire spread. Within this approach, the calibration test without combustible façade decouples the intricate interaction between gas‐phase combustion and material pyrolysis, which simplifies diagnostics and provides an ideal scenario for model validation. This paper presents large eddy simulations (LES) accompanied by comparisons of calibration tests in accordance with JIS A 1310. The calibration tests were conducted to obtain the flame morphologies, gas‐phase temperature, and heat flux of over‐ventilated façade fires, and the LES modeling is complemented by the modified eddy dissipation model for combustion, the one‐equation model for the sub‐grid scale turbulence, and the discrete ordinate method with the gray mean absorption‐emission approach for thermal radiation. The accuracy of LES data is discussed by comparing with measurements, and the mesh resolution is optimized as 2.5 cm for achieving mesh independency with good qualitative agreement. Furthermore, simulations are conducted to investigate the impact of sidewall distances on façade flame spread. The results highlight that the enhancement of sidewall in façade flame spread occurs under external heat release rate, and the 0.2 m sidewall distance for the designated JIS test is identified as a critical threshold increasing façade thermal load.
The requirements for exterior finishing materials have been substantially established recently. After a fire at an apartment building in Uijeongbu City, fire safety requirements for exterior finishing materials used in the buildings that have six and more stories or are taller than 22 meters were specified in 2015, and three and more stories or are taller than 9 meters were specified in 2019. However, the buildings built before that may not accomplish the safety requirements and thus have fire safety problem. This study suggests a method for partially reinforcing the Exterior Insulation Finishing System (EIFS) of buildings to enhance the fire safety. EIFS specimens whose walls on the pilotis were reinforced with a mineral insulation material, were tested in accordance with BS 8414-1. The result showed that fire spread was delayed more than 9 min when compared with an EIFS specimen without reinforcement.
