开放风环境下车辆火灾温度场演化机制及其影响性分析  

Evolution Mechanism and Impact Analysis of Temperature Field in Vehicle Fire under Open Wind Environment

作　　者：王欣 李金娥 宋永生[1] WANG Xin;LI Jin'e;SONG Yongsheng(Jinling Institute of Technology,Nanjing 211169,China)

机构地区：[1]金陵科技学院建筑工程学院,江苏南京211169

出　　处：《金陵科技学院学报》2024年第3期54-61,共8页Journal of Jinling Institute of Technology

基　　金：国家自然科学基金青年项目(11502101);江苏省自然科学基金(BK20211003)。

摘　　要：缆索钢丝耐火性能较差,一旦遭受火灾,将严重影响桥梁结构安全。以某悬索桥车辆火灾事故为背景,采用Pyrosim软件构建了火场仿真模型,对火势发展规律及空间温度场时程变化进行了分析,研究了多种因素对桥梁吊索温度场的影响。研究表明:火灾温度在模拟初始阶段表现为持续上升趋势,达到峰值后保持稳定;热释放速率与风速和风向的关联性较弱;在模拟实验中,吊索所达到的最高温度及其影响范围与风速和风向紧密相关。此外,适当的风速会加剧燃烧物的燃烧,并且会影响火焰相对吊索的高度和角度。The steel wire in cable exhibits poor fire resistance,posing a significant risk to bridge safety in the event of a fire.Using the vehicle fire accident of a suspension bridge as the background,a fire simulation model is constructed using Pyrosim software to analyze the fire s progression and the spatial temperature field over time.The impact of various factors on the temperature field of the bridge suspension cable is studied.Research shows that the temperature of the simulated fire initially rises continuously and remains stable after reaching peak.The heat release rate demonstrates a weak correlations with wind speed and direction.Additionally,simulation experiments reveal that the maximum temperature of the sling and its influence range are closely related to wind speed and direction.Furthermore,the appropriate wind speed can intensify the combustion of the burning material and affect the height and angle of the flame to the sling.

关 键 词：悬索桥 车辆火灾 开放风环境 空间温度场 抗火性能 

分 类 号：U447[建筑科学—桥梁与隧道工程]