| Title: | Investigating the thermal penetration in structural timber elements exposed to natural fires |
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| Authors: | ID Lucherini, Andrea (Author)
ID Mózer, Vladimír (Author) |
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| Files: |  URL - Source URL, visit https://doi.org/10.52202/080513-0450
 PDF - Presentation file, download (3,57 MB)
MD5: 778543A6439ABCF343F23E77ADFAD200
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| Language: | English |
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| Typology: | 1.08 - Published Scientific Conference Contribution |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | This study investigates fire-induced charring and thermal penetration in structural timber elements exposed to natural fire conditions, with a focus on the critical role of the cooling phase. A simplified 1D heat transfer model, based on Eurocode 5 temperature-dependent material properties, is implemented to simulate the thermal response of timber members subjected to Eurocode parametric fire curves. The analysis quantifies the char depth (300 °C isotherm) and the zero-strength layer, using both temperature-based (80-300 °C and 120-300 °C) and reduced mechanical properties approaches (tension and compression). Results show that, while the char depth predominantly develops during the heating phase, the zero-strength layer continues to grow during cooling, often reaching a thickness comparable to the char layer. The effective char depth (char depth + zero-strength layer) typically reaches its maximum towards the end of the cooling phase, representing the most critical condition for load-bearing capacity. The most severe conditions arise in low ventilation and high fuel load scenarios, characterised by long-duration fires rather than the highest temperatures. The findings highlight the need to explicitly consider the cooling phase in performance-based fire design for timber structures. |
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| Keywords: | timber structures, fire safety, charring, zero-strength layer, cooling |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.06.2025 |
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| Publisher: | World Conference on Timber Engineering |
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| Year of publishing: | 2025 |
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| Number of pages: | str. 3674-3683 |
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| PID: | 20.500.12556/DiRROS-23009  |
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| UDC: | 624 |
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| DOI: | 10.52202/080513-0450 |
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| COBISS.SI-ID: | 241463811 |
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| Copyright: | © WORLD CONFERENCE ON TIMBER ENGINEERING 2025 (WCTE 2025) |
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| Note: |
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| Publication date in DiRROS: | 16.07.2025 |
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| Views: | 375 |
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| Downloads: | 251 |
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