高速铁路大跨度箱梁温度分布研究

高速铁路桥上列车运行的平稳性、安全性,是大跨结构桥梁必须解决的问题。随着跨度的增大,箱梁壁厚不断增大,目前铁路规范温度参数取值已不尽合理,不能准确反映厚壁混凝土结构的温度分布。为系统研究大跨度箱梁的温度分布,文章以贵广铁路幸福源特大桥为工程背景,通过现场实测,数值计算模拟等方法开展研究,分析归纳总结出大跨度箱梁不同壁厚在日照和寒潮作用下的温度场分布,为规范的进一步完善提供数据支撑。

Research on Temperature Distribution of Large Span Box Girder of High-speed Railway

The stability and safety of trains running on high speed railway bridges are the problems that must be solved for long-span bridges. With the increase of the span,the wall thickness of the box girder increase continuously. At present,the temperature parameters in the railway code are not reasonable,therefore it cannot accurately reflect the temperature distribution of the thick-walled concrete structure. In order to systematically study the temperature distribution of the large-span box girders,taking Xingfuyuan super major bridge of Guiyang-Guangzhou Railway as engineering background,this paper carries out the study through field measurement and numerical calculation simulation,analyzes and summarizes the distribution of temperature field of large-span box girders with different wall thickness under the action of sunshine and cold tide,which provides data support for the further improvement of the code.