实际火灾场景下不锈钢伞状结构倒塌分析  

Collapse analysis of stainless steel umbrella structure in actual fire scene

作　　者：陈威 宗金辉 沈丹月 Chen Wei;Zong Jinhui;Shen Danyue(School of Civil Engineering and Transportation,Hebei Uni-versity of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《消防科学与技术》2024年第10期1379-1387,共9页Fire Science and Technology

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。In order to study the collapse mechanism of the stain-less 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 scaleddown size of 1:4.The thermal-structural coupling analysis method is then employed to research the fire-resistant perfor-mance of the structure under different fire scenarios.The results demonstrate that the relocation of the fire source has a consider-able 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 crosssectional area will cause the entire structure to collapse and suffer damage,whereas when the fire source is located under the pri-mary strut,it will only cause localised damage to the structure in the area under fire,with the remaining structure retaining a cer-tain load-bearing capacity.

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 

分 类 号：X913.4[环境科学与工程—安全科学] TU391[建筑科学—结构工程]