透明防火涂料对暴露于火中的胶合层压木材炭化行为影响的实验研究

IF 3.4 3区 工程技术 Q2 ENGINEERING, CIVIL
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引用次数: 0

摘要

随着木结构建筑向更高更长的方向发展,迫切需要提高木结构的耐火性。考虑到木材的炭化行为对木结构的耐火性至关重要,因此通过涂抹透明防火涂料来延缓木材的炭化行为并进一步提高其耐火性是一种很有前景的方法。本研究进行了一系列火灾试验,以研究在 ISO 834 标准的小规模火灾条件下,透明防火涂料对花旗松胶合层压材(胶合木)炭化行为的影响。实验中考虑了不同的涂层类型、涂层数量、暴露在火中的时间和构件尺寸。实验结果包括未涂覆和涂覆胶合木试样的温度曲线、最高温度和炭化率,并进行了仔细记录和分析。然后,通过提出的延迟炭化比率量化了透明防火涂层的效果。最后讨论了火灾中延迟炭化的主要机理。这项研究表明,两种透明防火涂料都能有效降低不同深度的温度,延迟木材的炭化行为。随着涂料用量的增加,炭化率的降低幅度增大,而随着火灾暴露时间的延长,炭化率的降低幅度减小。在火灾初期阶段,两种涂料的延迟炭化率可达 30% 以上,在标准火灾暴露 1 小时后,延迟炭化率可达 20% 以上。这项研究可为使用透明涂料提高木结构的耐火性提供技术支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental investigation into the effect of transparent fireproof coatings on charring behavior of glued laminated timber exposed to fire
As timber structures evolve towards greater heights and longer spans for buildings, there is a pressing need to enhance the fire resistance of timber structures. Considering the charring behavior of timber is crucial to the fire resistance of timber structures, it is a promising way to retard the charring behavior of timber and further enhance the fire resistance by applying transparent fireproof coatings. In this study, a series of fire tests were conducted to investigate the effect of transparent fireproof coatings on the charring behavior of Douglas fir glued laminated timber (Glulam) under small-scale ISO 834 standard fire conditions. Different coating types, coating quantities, exposed time to fire and member sizes were considered in the experiments. The experimental results including temperature profiles, maximum temperature, and charring rates for uncoated and coated Glulam specimens were carefully recorded and analyzed. Then, the effect of transparent fireproof coatings was quantified by the proposed ratio of delayed charring. The main mechanism of the delayed charring in fire was finally discussed. This study demonstrated that two transparent fireproof coatings can both effectively lower the temperature at different depths and delay the charring behavior of timber. The reduction in charring rates increased with the increase of coating quantity and decreased as the fire exposure time progressed. The ratio of delayed charring for two coatings can be over 30 % in the initial stage of fire and over 20 % for 1-h standard fire exposure. This study can provide technical support for enhancing the fire resistance of timber structures using transparent coatings.
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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.
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