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Browsing by Author "Frizzera, Giovanna Lyssa da Costa"

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  • Accurate 3D numerical models for the fire performance on LSF partition walls
    Publication . Frizzera, Giovanna Lyssa da Costa; Piloto, P.A.G.; Silva, Renata Gomes Lanna da
    The present study proposes a numerical model analysis of the fire performance of non-load bearing Light Steel Frame (LSF) walls under fire. Assessments were conducted under ISO 834 and hydrocarbon fire conditions, including the numerical validation of medium-scale experimental fire resistance tests. Comparison between numerical and experimental results employed three different computational solution methods for walls without cavity insulation. The hybrid method (solution method 1) considers convection and radiation in the cavity region, using the experimental cavity temperature. To predict this temperature, solution method 2 employs interface elements for radiation heat transfer, while solution method 3 considers radiation and convection in the cavity region. The analysis used the Root Mean Square Error (RMSE) to compare the temperature evolution at different locations on the wall section at specific time increments. The hybrid method (solution 1) presented a lower RMSE, providing a better approximation by considering phenomena such as cracks and material falls during the tests. The relative error was used to compare the fire resistance times obtained from numerical simulations and experimental tests. A parametric study was developed to investigate the thermal effect of the thickness and type of the wall protection layer, as well as the density of the insulation material. The results allowed for the formulation of a new proposal to predict fire resistance for insulation, considering the parameters analysed.
    2024Master thesis Open access Show more