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  • Predicting the effective char depth in timber elements exposed to natural fires, including the cooling phase [Elektronski vir]
    Lucherini, Andrea ; Šejnová Pitelková, Daniela ; Mózer, Vladimír
    This paper presents a numerical study on the effect of the heating and cooling phases on the reduction of the effective cross-section of timber elements, in particular on the evolution of the char ... depth (300°C isotherm) and zero- strength layer. An advanced calculation method based a finite-difference heat transfer model is compared to the simplified approach suggested by Eurocode 5. For the heating phase, defined as the standard fire curve (ISO 834), the simplified Eurocode 5 method generally provides more conservative char depths, while the zero-strength layer is under-predicted. Nevertheless, the values of effective char depth are comparable. Including the cooling phase evidences that, during this phase, the heat wave penetration leads to a significant increase in the char depth and zero-strength layer. Particularly, this increase directly depends on the fire cooling rate: a slower cooling phase further reduces the effective cross-section of timber members. As a result, this research highlights how the heat wave penetration during the fire cooling phase can significantly reduce the load-bearing capacity of timber elements.
    Vir: WCTE 2023 [Elektronski vir] : Proceedings from the 13th World Conference on Timber Engineering, 18-22 june, 2023, Oslo, Norway (Str. 1681-1690)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2023
    Jezik - angleški
    COBISS.SI-ID - 158332931

    Povezava(-e):

    https://www.proceedings.com/069179-0226.html
    https://www.proceedings.com/content/069/069179open.pdf
    DOI

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