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 ›› 2023, Vol. 42 ›› Issue (9): 1217-1222.

• • 上一篇    下一篇

花旗松原木梁构件耐火试验研究

刘激扬1, 尹亮2,3,4   

  1. （1. 国家消防救援局，北京 100054；2. 应急管理部天津消防研究所，天津 300381；3. 工业与公共建筑火灾防控技术应急管理部重点实验室，天津 300381；4. 天津市消防安全技术重点实验室，天津 300381）
  • 出版日期:2023-09-15 发布日期:2023-09-15
  • 作者简介:刘激扬（1970- ），女，国家消防救援局高级工程师，硕士，主要从事消防安全技术及管理研究，北京市西城区广安门南街70号，100054。
  • 基金资助:
    应急管理部消防救援局应用创新项目（2022XFCX24）；应急管理部天津消防研究所基本科研业务费项目（2021SJ07，2020SJ08）

Fire resistance test study on Douglas-fir timber beam elements

Liu Jiyang1, Yin Liang2,3,4   

  1. (1. National Fire and Rescue Administration, Beijing 100054, China; 2. Tianjin Fire Science and Technology Research Institute of MEM, Tianjin 300381, China; 3. Key Laboratory of Fire Protection Technology for Industry and Public Building, Ministry of Emergency Management, Tianjin 300381, China; 4. Tianjin Key Laboratory of Fire Safety Technology,Tianjin 300381,China)
  • Online:2023-09-15 Published:2023-09-15

摘要： 目前原木结构建筑广泛使用，面临耐火性能评估和提升需求。本文对当前木构件耐火性能研究方法和现状进行了简述，针对花旗松小截面（200 mm×100 mm）原木梁构件设计并实施了常温试验以及基于碳氢（HC）和标准升温曲线的耐火试验。研究发现：梁构件在常温下脆性破坏，在以上2种温升条件下均整体弯曲失效，且耐火极限分别为17 min和20 min；构件横截面温度特征及实测炭化结果显示,近跨中截面的炭化速率更大。建议由构件整体耐火试验反演获得炭化特性，以涵盖构件材质不均匀等随机影响，同时提出基于火灾升降温全过程的炭化评估方法。

关键词: 花旗松原木, 炭化速率, 耐火极限, 木梁构件

Abstract:  Currently raw timber frame buildings are still widely used and face the need for fire resistance assessment and upgrading. This paper provides a brief overview of the current methods and status of research into the fire resistance of wood components, and designs and implements ambient temperature tests as well as fire resistance tests based on hydrocarbon (HC) and standard heating curves for small-section (200 mm×100 mm) log beam components of Douglas-fir. It was found that: the beam members were brittle at ambient temperature and failed in overall bending at both temperature rising conditions, with fire resistance limits of 17 min and 20 min respectively; the cross-sectional temperature characteristics and the measured charring results showed that the charring rate was greater near the mid-span section. It is recommended that the charring characteristics be obtained by inversion of the overall fire resistance test to cover random effects such as non-uniformity of the component material, and that a charring assessment method based on the whole process of fire temperature rise and fall also be developed.

Key words: Key words: Douglas fir timber, charring rate, fire resistance rating, timber beam elements