摘要
为探明在不同火灾规模下地下共用结构的整体安全性,进而为类似地下结构防火设计提供参考依据,以义乌商城大道隧道工程为依托,采用有限元软件ANSYS建立火灾下地下共用结构非线性瞬态热-力耦合分析模型,重点研究地下共用结构在不同火灾规模下的位移、应力变化规律以及结构各截面的安全系数。研究结果表明:1)隧道内火灾规模的扩大会使混凝土力学性能劣化程度愈加严重,在地层荷载作用下受火结构顶板位移急剧增大,而其相邻水平共用结构顶板位移逐渐减小,进而改变共用结构的整体变形形态;且火灾高温作用会使得隧道共用结构发生应力重分布,其应力变化程度随火灾规模的增大而显著增大。2)隧道内大型客车发生火灾时,受火结构对其相邻的水平共用结构应力及安全性有较大影响,而对竖向共用结构影响较小,但可保证共用结构整体安全。
In order to clear the holistic safety of the underground combined structure under different fire scales,and provide reference for the fire protection design of tunnel structures,a non-linear transient thermal-mechanical coupling analysis model for the underground combined structure of Shangcheng Avenue Tunnel in Yiwu under fire is established by using finite element software ANSYS;the variation laws of the displacement and stress of the underground combined structure under different fire scales are studied;and the safety factor of each cross-section of the tunnel structure is analyzed as well.The results show that:(1)The increasing fire scale in the tunnel will deteriorate the mechanical properties of the concrete more seriously,and the displacement of the roof of the fire-affected structure will increase sharply under loading effect;nonetheless,the displacement of the roof of the adjacent horizontal combined structure decreases gradually,which will change the holistic deformation form of the combined structure;the stress redistribution occurs in the underground combined structure under fire,and the degree of changing stress will increase significantly with the increase of the fire scale.(2)When a megabus in the tunnel is ignited,the fire-affected structure has a greater impact on the stress and safety of the adjacent horizontal combined structure,but a smaller impact on the vertical combined structure,which still ensures the holistic safety of the underground combined structure.
作者
金威
田源
闫自海
王明年
JIN wei;TIAN Yuan;YAN Zihai;WANG Mingnian(POWERCHINA Huadong Engineering Corporation Limited,Hangzhou 311122,Zhejiang,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)
出处
《隧道建设（中英文）》
北大核心
2020年第2期215-222,共8页
Tunnel Construction
关键词
地下共用结构
热-力耦合
火灾规模
安全系数
数值模拟
underground combined structure
thermal-mechanical coupling
fire scale
safety factor
numerical simulation
作者简介
第一作者:金威(1992—),男,浙江义乌人,2015年毕业于同济大学,隧道及地下建筑工程专业,硕士,工程师,现从事隧道设计研究工作。E-mail:jin_w3@ecidi.com。
