Simulation study on fire spread of different exterior insulation facade structures in high rise buildings

doi:10.16265/j.cnki.issn1003-3033.2024.05.1692

Abstract

Abstract:

In order to clarify the relationship between the exterior insulation facade structure and fire spread in high-rise buildings, Pyrosim fire simulation software was used to study the impact of different exterior insulation facade structures on fire spread in high-rise buildings. The results show that during the process of fire spread on the exterior facade of high-rise buildings, the insulation systems of different exterior facade structures reduce the air entrainment capacity and heat release rate as the degree of structural space limitation increases. However, their chimney effect is significantly enhanced, and the smoke flow rate is faster, leading to an accelerated vertical fire spread speed. As the thickness of the air layer increases, the temperature and smoke flow rate of the aluminum curtain wall structure insulation system first increase and then show significant fluctuations. The aging of the performance of the external wall insulation system will increase the risk of fire on the exterior facade of high-rise buildings.

Key words: high rise buildings, facade structure, fire spread, numerical simulation, external wall insulation

CLC Number:

X932爆炸安全与防火、防爆

ZHANG Ying, HUANG Guohong, LONG Yujiao. Simulation study on fire spread of different exterior insulation facade structures in high rise buildings[J]. China Safety Science Journal, 2024, 34(5): 122-128.

Figures/Tables 9

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References 24

[1]	孙嘉宁. 既有高层住宅消防安全评价研究[D]. 西安: 西安建筑科技大学, 2022.
	SUN Jianing. Fire safety evaluation study of existing high-rise residential buildings[D]. Xi'an: Xi'an University of Architecture and Technology, 2022.
[2]	潘晓菲. 凹型建筑外立面火灾蔓延特性数值模拟研究[D]. 淮南: 安徽理工大学, 2019.
	PAN Xiaofei. Study on numerical simulation study on fire spread characteristics of facade in high-rise building[D]. Huainan: Anhui University of Science and Technology, 2019.
[3]	吕辰, 夏新兴, 潘锴, 等. 高层建筑凹型结构外立面火灾竖向蔓延规律数值模拟[J]. 科学技术与工程. 2022, 22(31): 14 065-14 071.
	LYU Chen, XIA Xinxing, PAN Kai, et al. Numerical simulation of the vertical spread law of fire on the concave structure facade of high-rise buildings[J]. Science Technology and Engineering, 2022, 22(31): 14 065-14 071.
[4]	何灿. 建筑立面阳角构型条件下聚氨酯保温材料火蔓延行为研究[D]. 合肥: 安徽建筑大学, 2022.
	HE Can. Study on fire propagation behavior of polyurethane thermal insulation material under positive angle of building facade[D]. Hefei: Anhui Jianzhu University, 2022.
[5]	张威, 朱国庆, 张磊, 等. 三种常用外墙可燃保温材料竖向燃烧特性数值模拟研究[J]. 中国安全生产科学技术, 2012, 8(1):11-17.
	ZHANG Wei, ZHU Guoqing, ZHANG Lei, et al. Numerical investigation of the vertical combustion characters of three common external wall thermal insulation materials[J]. Journal of Safety Science and Technology, 2012, 8 (1): 11-17.
[6]	丁超, 朱难难, 兰清源, 等. 典型建筑外墙保温材料的燃烧及火蔓延行为研究[J]. 北京建筑大学学报, 2022, 38(1): 99-105.
	DING Chao, ZHU Nannan, LAN Qingyuan, et al. Study on burning and fire spreading behavior of typical building exterior insulation materials[J]. Journal of Beijing University of Civil Engineering and Architecture, 2022, 38(1): 99-105.
[7]	章涛林, 周晓冬, 雷杲, 等. 高层建筑典型外墙保温材料火蔓延特性数值模拟研究[J]. 防灾减灾工程学报, 2012, 32(2): 230-234.
	ZHANG Taolin, ZHOU Xiaodong, LEI Gao, et al. Simulation of fire spread of typical exterior wall insulation materials in high-rise building[J]. Journal of Disaster Prevention and Mitigation Engineering, 2012, 32 (2): 230-234.
[8]	AN Weiguang, PAN Rongliang, MENG Qingxuan, et al. Experimental study on downward flame spread characteristics under the influence of parallel curtain wall[J]. Applied Thermal Engineering, 2018, 128: 297-305.
[9]	张玉涛, 张玉杰, 李亚清. 凹型结构建筑外立面火灾蔓延特性模拟研究[J]. 中国安全科学学报, 2020, 30(8):70-78. doi: 10.16265/j.cnki.issn1003-3033.2020.08.011
	ZHANG Yutao, ZHANG Yujie, LI Yaqing. Simulation study on fire propagation characteristics on facade of concave structure buildings[J]. China Safety Science Journal, 2020, 30(8): 70-78. doi: 10.16265/j.cnki.issn1003-3033.2020.08.011
[10]	BAKHTIYARI S, TAGHI-AKBARI L, BARIKANI M. The effective parameters for reaction-to-fire properties of expanded polystyrene foams in bench scale[J]. Iranian Polymer Journal, 2010, 19(1): 27-37.
[11]	田佳鑫. 风作用下高层建筑外墙火焰蔓延模拟研究[D]. 沈阳: 沈阳建筑大学, 2022.
	TIAN Jiaxin. Numerical simulation of longitudinal spread of fire on exterior walls of high-rise buildings under wind action[D]. Shenyang: Shenyang Jianzhu University, 2022.
[12]	彭志昊. 环境风条件下超高层建筑火灾烟气运动规律研究[D]. 成都: 四川师范大学, 2022.
	PENG Zhihao. Research on fire smoke movement characteristics of super tall building under ambient wind condition[D]. Chengdu: Sichuan Normal University, 2022.
[13]	史健勇, 刘湃, 许清风. 室外风对高层建筑外保温层火灾发展的影响研究[J]. 防灾减灾工程学报, 2014, 34(5): 571-576.
	SHI Jianyong, LIU Pai, XU Qingfeng. Research on fire spread characteristics of insulation layers of high-rise buildings under outdoor wind condition[J]. Journal of Disaster Prevention and Mitigation Engineering, 2014, 34 (5): 571-576.
[14]	汪华兵. 外墙窗户面积及位置对建筑外立面火蔓延的影响[J]. 消防科学与技术, 2021, 40(12): 1743-1746.
	WANG Huabing. Influence of the area and location of windows in facade fire spread[J]. Fire Science and Technology, 2021, 40(12): 1743-1746.
[15]	汪帅. 建筑物窗口尺寸对火灾竖向蔓延影响的研究[J]. 防灾科技学院学报, 2014, 16(1): 20-24.
	WANG Shuai. Research of flame spread through a building's exterior wall of different window dimensions[J]. Journal of Institute of Disaster Prevention, 2014, 16 (1): 20-24.
[16]	包肖萌. 防火隔离带对外保温材料火灾蔓延影响实验研究[J]. 消防科学与技术, 2020, 39(2): 219-222.
	BAO Xiaomeng. Experimental study on the influence of fire insulation belt on fire spread of external wall[J]. Fire Science and Technology, 2020, 39 (2): 219-222.
[17]	赵金. 高层建筑外墙火蔓延阻隔方法研究[D]. 沈阳: 沈阳航空航天大学, 2017.
	ZHAO Jin. Research on fire spreading and barrier method for exterior wall of high-rise building[D]. Shenyang: Shenyang Aerospace University, 2017.
[18]	江文. 挑檐对建筑外立面典型装饰材料火蔓延抑制作用模拟研究[D]. 合肥: 中国科学技术大学, 2016.
	JIANG Wen. Simulation study of inhibition effect of fire overhangs on typical building facade material flame spread[D]. Hefei: University of Science and Technology of China, 2016.
[19]	王宇, 邢佳, 周盈彤. 不同温度下超高层建筑窗口火蔓延模拟分析[J]. 中国安全科学学报, 2021, 31(3):121-127. doi: 10.16265/j.cnki.issn1003-3033.2021.03.017
	WANG Yu, XING Jia, ZHOU Yingtong. Simulation analysis of window fire spread in super high-rise building at different temperatures[J]. China Safety Science Journal, 2021, 31 (3): 121-127. doi: 10.16265/j.cnki.issn1003-3033.2021.03.017
[20]	NFPA 204 M-2018,Standard of smoke and heat venting[S].
[21]	GB/T 50176—2016, 民用建筑热工设计规范[S].
	GB/T 50176-2016,Thermal design code for civil building[S].
[22]	王霁, 孔伟, 冉雪晴. 湿热老化对阻燃聚酯纤维板燃烧性能的影响[J]. 上海纺织科技, 2022, 50(10): 31-35.
	WANG Ji, KONG Wei, RAN Xueqing. Influence of hygrothermal aging on the combustion performance of flame retardant polyester fiberboard[J]. Shanghai Textile Science & Technology, 2022, 50(10): 31-35.
[23]	柳爱静, 周勇, 侯亚楠, 等. 热氧老化对聚苯乙烯燃烧性能的影响[J]. 消防科学与技术, 2014, 33(12): 1361-1363.
	LIU Aijing, ZHOU Yong, HOU Yanan, et al. Influence of thermal oxidative aging on the combustion propreties of XPS[J]. Fire Science and Technology, 2014, 33 (12): 1361-1363.
[24]	王国辉, 王俊胜, 刘丹, 等. 高低温交变老化对聚合物基保温材料燃烧性能的影响[J]. 合成材料老化与应用, 2017, 46(6): 1-4, 33.
	WANG Guohui, WANG Junsheng, LIU Dan, et al. The effect of high-low temperature cycle aging on combustion properties of polymer-based thermal insulation materials[J]. Synthetic Materials Aging and Application, 2017, 46 (6): 1-4, 33.

外立面结构	X或 R/m	Y / m
平面	—	—
凹面1.0	1.0	1.0
凹面2.0	0.6	1.2
凸弧形1.0	1.0	—
凸弧形1.5	1.5
凸弧形2.0	2.0

网格单元格尺寸/m	网格数量/个	不同高度(中心线)探测点的温度/℃					平均误差/%
网格单元格尺寸/m	网格数量/个	4 m	10 m	16 m	22 m	28 m	平均误差/%
0.09	113 520	897.1	897.7	899.0	797.6	843.3	—
0.10	89 280	885.5	882.5	924.2	911.3	850.4	4.1
0.12	51 600	810.8	886.2	922.0	875.2	891.0	5.7
0.14	27 846	825.5	896.0	829.8	749.5	724.2	7.2

外立面结构	最大热释放速率/kW	火焰达到顶部的时间/s	最高温度/℃
平面	35 877	20.2	1 006
凹面1.0	28 313	15.9	950
凹面2.0	19 100	15.2	1 121
凸弧形	51 550	20.7	1 014

EPS使用时间/a	导热系数/ (W·m^-1·K^-1)	燃点/ ℃	阻燃剂占 EPS含量/%	老化降解
1	0.041	450	1.0	无变化
10	0.044	400	0.5	降解1/2
25	0.050	100	0	基本完全降解