主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2022, Vol. 41 ›› Issue (8): 1046-1050.

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低辐射强度下古建筑木构件材料的燃烧特性

袁春燕，谷彦鹏，李明倩，柴国芫   

  1. （长安大学 建筑工程学院，陕西 西安 710061)
  • 出版日期:2022-08-15 发布日期:2022-08-15
  • 作者简介:作者简介：袁春燕（1977-），女，甘肃金昌人，长安大学建筑工程学院副教授，硕士研究生导师，博士，主要从事古建筑火灾风险管理、BIM与施工安全等研究，陕西省西安市雁塔区长安中路161号，710061。
  • 基金资助:
    国家自然科学基金项目(51608049)

Combustion characteristics of wood components of ancient buildings under low radiation intensity

YUAN Chun-yan, GU Yan-peng, LI Ming-qian, CHAI Guo-yuan   

  1. (College of Architecture Engineering, Chang'an University, Shaanxi Xi'an 710061, China)
  • Online:2022-08-15 Published:2022-08-15

摘要： 为研究古建筑木构件材料在火灾下的燃烧特性，使用锥型量热仪对古木材试样的点燃时间、临界辐射强度、热释放速率、燃烧气体中CO2体积分数等燃烧特性进行试验研究。试验发现3种不同厚度试样的临界辐射强度分别为8.81，9.40，10.55 kW/m2。试样厚度增加会使古木材点燃时间延长，临界辐射强度增大，材料的热释放速率所形成的双峰值曲线的峰值降低。燃烧气体中CO2体积分数曲线与热释放速率所绘制出的曲线的形态一致，同一厚度的试样在不同辐射强度下其燃烧特性呈现出显著区别。与新木材相关燃烧特性参数对比，劣化后的古木材临界热辐射强度降低、点燃时间减小，5 min内平均热释放速率较高。研究表明，古建筑木构件材料燃烧特性有显著变化，可为古建筑火灾研究提供参考。

关键词: 古松木材料, 材料厚度, 热辐射强度, 锥型量热仪, 燃烧特性

Abstract: In order to study the combustion characteristics of ancient building wood components under fire, the combustion features such as ignition time, critical radiation intensity, heat release rate and CO2 volume fraction in combustion gas of ancient wood were studied by cone calorimeter. The results show that the critical radiation intensities of samples with 3 different thickness are 8.81, 9.40，10.55 kW/m2 respectively. The increase of thickness will extend the ignition time, increase the critical radiation intensity, and reduce the peak value of the double peak curve formed by the heat release rate of the material, . And the CO2 volume fraction curve is consistent with the curve drawn by the heat release rate. The combustion characteristics of samples with the same thickness show significant differences under different radiation intensity. Compared with the relevant combustion characteristic parameters of new wood, the critical heat radiation intensity and ignition time of aged ancient wood decreased, and the average heat release rate within 5 minutes was higher. The research shows that the combustion characteristics of wood components of ancient buildings have significant changes, which can provide a reference for the study of ancient building fire.

Key words: ancient pine material, material thickness, thermal radiation intensity, cone calorimeter, combustion characteristic