对工程木材炭化层形成和损失的观察和影响

IF 3.4 3区 工程技术 Q2 ENGINEERING, CIVIL Fire Safety Journal Pub Date : 2024-06-04 DOI:10.1016/j.firesaf.2024.104196
Laura Schmidt , Rory M. Hadden , Dilum Fernando
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引用次数: 0

摘要

炭化层对工程木材的防火性能起着至关重要的作用。一些化学和物理过程可以减少炭化层的厚度和完整性。一系列实验研究了 12 根交叉层压木材(CLT)柱子(130 × 790 × 125 mm WxHxD),这些柱子暴露在热荷载(20 kW/m2 或 50 kW/m2)和机械荷载(39 kN,偏心)的双重作用下。观察了表面薄片的炭化损失,并研究了这对木材热反应的影响。在所有情况下,未受保护的 CLT 都会出现炭化块脱落的现象。裂缝、收缩和炭化移动在很大程度上导致下层木材暴露于外部加热。在这种结构中,木炭脱落与测量到的胶线温度之间没有直接关联。为了对有无木炭脱落的 CLT 进行比较,在六个样本的暴露表面添加了一薄层玻璃纤维增强聚合物,以防止所有木炭脱落。与有木炭脱落的样品相比,保留木炭层可大大降低木炭层下的温度、截面损失和燃烧持续时间。
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Observations and impact of char layer formation and loss for engineered timber

The char layer plays a critical role in the fire behaviour of engineered timber. Several chemical and physical processes can reduce char layer thickness and integrity. A series of experiments studied 12 cross-laminated timber (CLT) columns (130 × 790 × 125 mm WxHxD) exposed to combined thermal (20 kW/m2 or 50 kW/m2) and mechanical loading (39 kN, eccentric). Char loss from the surface lamella was observed and the impact of this on the thermal response of the timber studied. In all cases, unprotected CLT exhibited fall-off of charred pieces. Cracking, shrinkage and movement of char contributed significantly to the exposure of underlying timber sections to external heating. There was no direct correlation between char fall-off and the measured glue line temperature in this configuration. To enable comparison between CLT with and without char fall-off, a thin layer of glass fibre-reinforced polymer was added to the exposed surface of six samples which prevented all char fall-off. Retention of the char layer significantly decreased temperatures beneath the char layer, loss of section and burning duration compared to samples with char fall-off.

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来源期刊
Fire Safety Journal
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.
期刊最新文献
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