Charring design model for light timber frame assemblies with load-bearing I-joists

IF 3.4 3区工程技术 Q2 ENGINEERING, CIVIL

Fire Safety Journal Pub Date : 2025-03-09 DOI:10.1016/j.firesaf.2025.104369

Katrin Nele Mäger , Alar Just

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Abstract

As factory-manufactured, ultra-light and highly optimised products for load-bearing frame structures, wooden I-joists provide an extended range of applications for light timber frame assemblies. The fire resistance of such wooden structural products may be the deciding factor limiting their wider use. Moreover, the current European design standard for timber structures in fire does not include guidance for I-joists.

The development of charring coefficients is based on six model-scale furnace fire tests and an extensive series of thermal simulations. The results of fire tests and finite element simulations were compared. Thermal simulations were on the safe side.

The charred cross-section areas obtained from thermal simulations were analysed. Charring coefficients were developed in accordance with the current draft of FprEN 1995-1-2. The charring coefficients were developed so that their combination would capture the simulation results as accurately as possible, therefore creating a conservative result compared to furnace tests.

The charring coefficients proposed within this paper were validated against the model-scale fire tests. The new set of coefficients appropriately captures the available test data.

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承载工字梁的轻型木结构构件的炭化设计模型

作为工厂制造的、超轻的、高度优化的承重框架结构产品，木制工字托梁为轻型木结构组件提供了广泛的应用。这类木结构产品的耐火性能可能是限制其广泛应用的决定性因素。此外，目前的欧洲木结构防火设计标准不包括工字梁的指导。炭化系数的发展是基于六个模型规模的炉火试验和一系列广泛的热模拟。对火灾试验结果和有限元模拟结果进行了比较。热模拟是安全的。对热模拟得到的焦化截面面积进行了分析。炭化系数是根据FprEN 1995-1-2的现行草案制定的。开发了炭化系数，以便它们的组合能够尽可能准确地捕获模拟结果，因此与炉内测试相比，产生了保守的结果。本文提出的炭化系数通过模型尺度着火试验得到了验证。新的系数集适当地捕获了可用的测试数据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fire Safety Journal 工程技术-材料科学：综合

CiteScore

5.70

自引率

9.70%

发文量

153

审稿时长

60 days

期刊介绍： Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.