摘要
为研究预埋碳纤维发热线桥面的升温性能,使用有限元软件建立温度场模型,分析发热线间距、埋深、温度及沥青混凝土比热容、密度、导热系数对桥面铺装层升温效果的影响.结果表明:结构表面温度与发热线的间距及埋深呈负相关,在环境温度为-5℃,发热线间距、埋深分别为8和4 cm时,加热2 h后结构表面温度处于2.10~3.54℃之间,温度场分布均匀;发热线温度在30℃以上时,桥面温度均大于0℃,且桥面温度随发热线温度升高而近似线性增长;结构表面温度与沥青混凝土的比热容及密度呈负相关,但影响较弱;沥青混凝土导热系数自3600 J·m-1·h-1·℃-1提高至4800 J·m-1·h-1·℃-1时,桥面温度可提高86%.总之,结构表面温度与沥青混凝土的导热系数呈正相关关系,且受影响较大;发热线间距为8 cm、埋深为4 cm时,升温性能最佳.
In order to study the heating performance of the bridge deck with embedded carbon fiber heating wires,the finite element software was used to establish the temperature field model.The influences of heating wires’interval,depth,temperature,and asphalt concrete’s specific heat capacity,density,thermal conductivity on the heating effect of bridge deck pavement were analyzed.The results show that there is a negative correlation between the surface temperatures of the structure and the interval and depth of heating wires.When the interval and depth of heating wires are 8 cm and 4 cm respectively,with a external temperature-5℃,the surface temperatures of the structure range from 2.10℃to 3.54℃after heating for 2 hours,which makes a evenly distributed temperature field.The bridge surface temperatures rise above 0℃if the heating wires temperature is above 30℃.Approximately the surface temperature linearly increases with the increasing of the heating wires temperature.The surface temperature of the structure is negatively correlated with the specific heat capacity and density of asphalt concrete that have little influence on the temperature.With the thermal conductivity of asphalt concrete from 3600 J·m-1·h-1·℃-1 to 4800 J·m-1·h-1·℃-1,the bridge deck temperatures will increase by 86%.In a word,the surface temperatures of the structure have a positive correlation with the thermal conductivity of asphalt concrete,which is greatly affected.To achieve the best heating performance,the interval and depth of heating wires are 8 cm and 4 cm,respectively.
作者
袁玉卿
张业
郭斌
张铠显
YUAN Yuqing;ZHANG Ye;GUO Bin;ZHANG Kaixian(Kaifeng Research Center for Engineering Repair and Material Recycle,Henan University,Henan Kaifeng475004,China;bSchool of Civil Engineering and Architecture,Henan Kaifeng475004,China)
出处
《河南大学学报（自然科学版）》
CAS
2020年第1期100-107,共8页
Journal of Henan University:Natural Science
基金
河南省高等学校重点科研项目计划(20A580001)
河南大学研究生教育创新与质量提升计划项目(SYL19060129)
河南省科技发展计划项目(162102210026).
关键词
道路工程
融雪化冰
有限元
碳纤维发热线
沥青混凝土
road engineering
melting snow and ice
finite element
carbon fiber heating wire
asphalt concrete
