Experimental study on the burning behavior of wood with radial crack under fire conditions

IF 2.5 3区农林科学 Q1 FORESTRY

European Journal of Wood and Wood Products Pub Date : 2025-07-19 DOI:10.1007/s00107-025-02292-2

Wei Peng, Heng Gu, Yi-Ting Wang, Yue Zhou

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引用次数: 0

Abstract

Recent studies have identified radial cracks in post and beam supports in timber structures, but there is a lack of systematic studies on the effect of cracks on burning behavior. In this study, the burning behavior of timber specimens with inclination angles of 0°, 15°, 30° and 45° and varying cross-section widths was investigated. The analysis of flame patterns, temperature profiles, the mass loss rate and charring degree showed that cracks had a significant effect on the combustion behavior of wood. The mass loss rate (MLR) was higher for wood with radial cracks compared to wood without cracks. By introducing the concept of charring volume and assessing the effect of cracks based on charring length and depth, it can be seen that cracks have the greatest effect on the area directly exposed to the flame. The effect of cracks increases dramatically when the angle reaches 30°. Cracks affect combustion through two main mechanisms: firstly, external heating accelerates the airflow at the crack, creating an entrainment effect that increases the oxygen content in the combustion zone; secondly, the accelerated airflow enhances thermal convection. This study provides a comprehensive analysis of the effect of cracks on combustion behavior and provides a reference for the restoration of timber-framed buildings.

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含径向裂纹木材在火灾条件下燃烧特性的实验研究

近年来已有研究发现木结构柱梁支撑存在径向裂缝，但缺乏对裂缝对燃烧行为影响的系统研究。研究了倾角为0°、15°、30°和45°的木材试件在不同截面宽度下的燃烧行为。火焰模式、温度分布、质量损失率和炭化程度分析表明，裂纹对木材的燃烧行为有显著影响。有径向裂纹的木材的质量损失率（MLR）高于无裂纹的木材。通过引入炭化体积的概念，根据炭化长度和深度对裂纹的影响进行评价，可以看出裂纹对直接暴露在火焰下的面积影响最大。当夹角达到30°时，裂纹的影响急剧增加。裂纹主要通过两种机制影响燃烧：首先，外部加热加速裂纹处的气流，产生夹带效应，增加燃烧区氧含量；其次，加速气流增强了热对流。本研究全面分析了裂缝对燃烧性能的影响，为木结构建筑的修复提供了参考。

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来源期刊

European Journal of Wood and Wood Products 工程技术-材料科学：纸与木材

CiteScore

5.40

自引率

3.80%

发文量

124

审稿时长

6.0 months

期刊介绍： European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.