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 ›› 2024, Vol. 43 ›› Issue (10): 1379-1387.

• • 上一篇    下一篇

实际火灾场景下不锈钢伞状结构倒塌分析

陈威, 宗金辉, 沈丹月   

  1. (河北工业大学 土木与交通学院,天津 300401)
  • 收稿日期:2024-04-30 修回日期:2024-06-25 出版日期:2024-10-15 发布日期:2024-10-15
  • 作者简介:作者简介:陈 威(1999- ),男,河北保定人,河北工业大学土木与交通学院硕士研究生,主要从事结构抗火研究,天津市北辰区西平道5340号,300401。

Collapse analysis of stainless steel umbrella structure in actual fire scene

Chen Wei,Zong Jinhui,Shen Danyue   

  1. (School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China)
  • Received:2024-04-30 Revised:2024-06-25 Online:2024-10-15 Published:2024-10-15

摘要: 为研究不锈钢伞状结构在实际火灾场景下的倒塌机制,本文以一个缩尺1:4的不锈钢伞状结构火灾试验为基础,建立并验证了有限元分析模型,通过热-结构耦合分析方法,对其在不同火灾场景下的抗火性能进行研究。结果表明:火源位置改变对伞状结构耐火性能有明显影响,当火源处于同一水平高度时,发生在截面面积小的次支杆下方的火灾将引起结构整体倒塌破坏,而当火源位于主支杆下方时,仅引起受火区域内结构的局部破坏,剩余结构仍有一定的承载能力。

关键词: 不锈钢, 伞状结构, 温度场模拟, 热-结构耦合分析, 连续倒塌

Abstract: In order to study the collapse mechanism of the stainless steel umbrella structure under actual fire scenarios, this paper establishes and validates a finite element analysis model based on the fire test of a stainless steel umbrella structure with a scaled-down size of 1:4. The thermal-structural coupling analysis method is then employed to research the fire-resistant performance of the structure under different fire scenarios. The results demonstrate that the relocation of the fire source has a considerable impact on the fire resistance performance of the umbrella structure. When the fire source is at the same horizontal height, the fire that occurs under the secondary strut with a small cross-sectional area will cause the entire structure to collapse and suffer damage, whereas when the fire source is located under the primary strut, it will only cause localised damage to the structure in the area under fire, with the remaining structure retaining a certain load-bearing capacity.

Key words: stainless steel, umbrella structure, temperature field simulation, thermal-structural coupling analysis, continuous collapse