摘要
在城镇化发展进程中,高层建筑作为容积率大,容纳人数多的一种独特建筑结构形式得到了迅猛发展,与此同时也给城市带来了较高的建筑火灾风险,尤其是随着凹型外立面墙体结构的设计使用,使得建筑火灾蔓延特性受到了显著影响。通过FDS数值模拟技术对不同凹型外立面结构因子影响下的火场温度、火焰前锋蔓延速率进行了研究,结果表明凹型外立面火灾竖向蔓延烟囱效应较明显;火焰前锋高度随时间符合指数函数变化关系,且当凹型外立面结构因子∂=0.5时,火灾前锋竖向蔓延速率达到最大。据此提出防火挑檐的合理设置可有效阻止火势沿凹型外立面向高处相邻住户蔓延。研究成果对凹型外立面建筑结构消防安全优化设计具有一定的理论指导意义。
In the process of urbanization development,high-rise buildings have been developed rapidly as a unique architectural structure with large floor area ratio and large number of people,at the same time,a higher risk of building fires is brought to the city.Especially with the design and use of the concave facade wall structure,the fire spread characteristics of the building have been significantly affected.FDS numerical simulation technology was used to study the fire temperature and flame front propagation rate under the influence of different concave facade structural factors.The results showed that the chimney effect of vertical fire spread on the concave facade was more obvious.The height of the flame front conforms to the exponential exponential function change relationship with time,when the structure factor of concave facade∂=0.5,the vertical spread rate of the fire front reached the maximum.Accordingly,the reasonable setting of fireproof eaves was proposed to effectively prevent the spread of fire along the concave facade to adjacent residents at high places.The research results have certain theoretical guiding significance for the optimal fire safety design of concave facade building structure.
作者
吕辰
夏新兴
潘锴
罗分
L Chen;XIA Xin-xing;PAN Kai;LUO Fen(College of Quality and Safety Engineering,China Jiliang University,Hangzhou 310018,China;College of Safety Science and Technology,Anhui University of Science and Technology,Huainan 232001,China)
出处
《科学技术与工程》
北大核心
2022年第31期14065-14071,共7页
Science Technology and Engineering
基金
浙江省自然科学基金(LQ20E040005)
国家重点实验室开放基金(JYBSYS2019102)。
关键词
凹型结构
火灾
结构因子
优化设计
concave structure
fire
structural factors
optimized design
