建筑结构学报2024，Vol.45Issue(10)：31-41,11.DOI:10.14006/j.jzjgxb.2023.0534
受限空间建筑火灾蔓延影响因素对比试验研究
Comparative experimental study on factors affecting fire spread in enclosed buildings
摘要
Abstract
To observe the fire spread spatiotemporal evolution within enclosed buildings and explore the fire spread process,a two-storey 2x2 moment-resisting steel framed structure was constructed.Four rooms were arranged on the first floor,and wood cribs were employed as the fire load.Four distinct scenarios were considered based on fire load,compartment elements and opening size.During the experiment,the fire spread process was observed by the camera,the gas-phase temperature field was recorded by thermocouples,and the heat release rate was measured based on oxygen-consumption method.The experiment reveals that the pre-flashover stage during the fire process has a significantly prolonged duration,accounting for 70％-85％of the total fire spread time.The fire rapidly intensifies in the post-flashover stage and propagates to adjacent rooms within a short timeframe.The heat release rate at fire spread stage is approximately 1.5 to 4 times that at the flashover stage.The findings indicates that the spread of fire in confined space buildings manifests itself as a transition from an uneven temperature field to a uniform temperature field in space,and as a gradual increase in the fire spread rate in time.Before the fire spreads,the temperature field of the target compartment is reduced to a certain extent compared to the temperature field of the fire room.Local fire load density and total fire load exhibit positive influences on enclosed fire spread.Opening size influences smoke propagation between compartments,and compartment elements barriers hinder smoke flow and flame propagation,which significantly affects the fire spread process.关键词
受限空间建筑/火灾蔓延/火灾试验/通风控制型火灾/热释放速率Key words
enclosed building/fire spread/fire experiment/ventilation-controlled fire/heat release rate分类
建筑与水利引用本文复制引用
叶继红,孙浩东..受限空间建筑火灾蔓延影响因素对比试验研究[J].建筑结构学报,2024,45(10):31-41,11.基金项目
国家自然科学基金面上项目(51978655),江苏省研究生科研与实践创新计划项目(KYCX22_2571),中国矿业大学研究生创新计划项目(2022WLKXJ055). （51978655）
