摘要
研究目的:针对现有桥梁设计中普遍将温度梯度作为设计荷载来设计主梁结构,从而造成建设成本增加且无法从根本上解决不利温度效应的现状,本文提出一种解决此类问题的桥面铺装隔温体系,即在桥面铺装内设置一层或多层陶粒混凝土,使得梁体与外界的热量交换得到有效阻隔,进而显著减小其竖向梯度温度效应。研究结论:(1)针对近年来公路桥规温度梯度曲线在实际设计工作中未得到广大桥梁工作者共识的原因,本文分析了规范表述的不完善之处及不合理性;(2)结合江苏省南京市近十年内7、8月的温度数据实测值,通过分析和实测数据的规律总结,得出适合江苏地区的不同铺装形式的混凝土箱梁的温度梯度模式;(3)采用桥面铺装隔温体系后,可有效改善桥梁结构的受力状况,工程总造价可降低10%~20%;(4)本研究成果可为今后江苏地区桥梁工程设计、施工和维护提供参考。
Research purposes:In view of the current situation that the temperature gradient is generally used as design load to design the main beam in the existing bridges,which results in the status of increased construction costs and cannot fundamentally resolve the negative temperature effect,this paper presents a bridge deck insulating system to solve such problems,one or more layers of ceramsite concrete are set in the bridge deck pavement to effectively block the heat exchange between the beam and the outside,thus significantly reducing the vertical gradient temperature effect.Research conclusions:(1)In recent years,the temperature gradient curves of Highway Bridge Specifications have not yet been widely agreed by the bridge designers,and this paper analyzes the irrationality and imperfection of the expression in the specification.(2)Combined with the temperature data measured in July and August in recent ten years in Nanjing city of Jiangsu Province,through the analysis and summary of the law of the measured data,the temperature gradient model of different pavement forms of concrete box girder suitable for Jiangsu area is obtained.(3)After adopting the bridge deck pavement insulation system,the stress condition of the bridge structure can be effectively improved,and the total project cost can be reduced by 10%~20%.(4)The research results can provide reference for the design,construction and maintenance of bridge engineering in Jiangsu in the future.
作者
蒋凯
JIANG Kai(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430063,China)
出处
《铁道工程学报》
EI
北大核心
2021年第4期50-55,共6页
Journal of Railway Engineering Society
关键词
梯度温度
主梁
桥面铺装
隔温
温度梯度模式
temperature gradient
main beam
bridge deck pavement
insulating
temperature gradient model
