摘要
为研究隧道、地铁和综合管廊合建结构薄弱处的抗火设计理论,保证在火灾情况下地下共用结构的安全性,以义乌商城大道车行隧道发生火灾为例,采用有限元分析软件ANSYS建立全尺寸火灾模型,利用热分析功能,研究不同火灾规模下结构温度场的分布规律,并采用理论分析的方法,对火灾后共用结构顶板极限承载力计算方法进行推导。研究结果表明:1)随火灾规模增加,混凝土径向影响范围逐渐增加,研究明确了不同火灾规模下轻、中、重度受损范围;2)提出了高温下钢筋与混凝土黏结强度、混凝土抗压强度以及钢筋屈服抗拉强度计算公式,并基于此给出了火灾后地下共用结构中隧道顶板极限承载力计算方法。
The combined structure of tunnel,subway and utility tunnel is always the weak position in fire,thus it is vital to study its structure safety.Taking Yiwu Shangcheng Avenue tunnel as an example,a full-scale fire model is established by finite element analysis software ANSYS,and the distribution law of structural temperature field under different fire scales is studied with thermal analysis function.Then the calculation method of ultimate bearing capacity of the roof of combined structure after fire is deduced by theoretical analysis.The results show that:(1)With the increase of fire scale,the radial influence range of concrete increases gradually,and the range of light,moderate and severe damage under different fire scales are defined;(2)The calculation formulas of bond strength between steel bar and concrete,compressive strength of concrete and yield tensile strength of steel bar under high temperature are proposed,and besides,the method for calculating roof ultimate bearing capacity of combined structure after fire is provided.
作者
闫自海
于丽
金威
YAN Zihai;YU Li;JIN Wei(POWERCHINA HUADONG Engineering Corporation Limited,Hangzhou 311122,Zhejiang,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)
出处
《隧道建设（中英文）》
CSCD
北大核心
2021年第S01期295-301,共7页
Tunnel Construction
关键词
地下共用结构
火灾规模
温度场
参数弱化
极限承载力
underground combined structure
fire scale
temperature field
weakness of mechanical parameters
ultimate bearing capacity
