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  • Estimating the effective char depth in structural timber elements exposed to natural fires, considering the heating and cooling phase [Elektronski vir]
    Lucherini, Andrea ; Šejnová Pitelková, Daniela ; Mózer, Vladimír
    This research study investigates the effect of different heating and cooling regimes on the effective cross-section of timber elements exposed to natural fires. An advanced calculation method based ... on a 1D finite-difference heat transfer model and effective thermo-physical properties is adopted to analyse the heat penetration and the consequent reduction in mechanical properties. In particular, the research focuses on the evolution and pene- tration speed of the char depth (300 ◦C isotherm) and zero-strength layer (determined through in-depth tem- peratures and reduced mechanical properties). Results reveal how the char depth mainly develops during the heating phase, with non-negligible contributions from the cooling phase. In contrast, the zero-strength layer increases throughout the whole fire exposure, particularly during cooling and, possibly, after the end of the cooling phase. In general, the heating phase contributes about 2/3 to the total effective char depth, while the cooling phase about 1/3. The most challenging conditions were found for the fires of the longest durations (heating and overall), corresponding to low ventilation and high fuel load density conditions. The study em- phasises the necessity of incorporating the cooling phase in performance-based methodologies for fire-safe timber structures to avoid under-estimating heat penetration effects.
    Vir: Engineering structures [Elektronski vir]. - ISSN 1873-7323 (Vol. 323, [article no.] 119255, Jan. 2025, str. 1-16)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2025
    Jezik - angleški
    COBISS.SI-ID - 216133891

    Povezava(-e):

    https://www.sciencedirect.com/science/article/pii/S0141029624018170
    DiRROS - Digitalni repozitorij raziskovalnih organizacij Slovenije
    DOI

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