高海拔地区钢-混凝土组合梁日照温度场研究  

Study on Solar Radiation Temperature Field of Steel⁃concrete Composite Girder in High Altitude Area

作　　者：陈胜利 苏永华 班新林 石龙 CHEN Shengli;SU Yonghua;BAN Xinlin;SHI Long(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State Key Laboratory for Track Technology of High-speed Railway,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]高速铁路轨道技术国家重点实验室,北京100081

出　　处：《铁道建筑》2021年第4期12-16,共5页Railway Engineering

基　　金：国家自然科学基金(71942006);中国国家铁路集团有限公司科技研究开发计划(K2019G005);中国铁道科学研究院集团有限公司基金(2019YJ057)。

摘　　要：青藏高原区呈现空气稀薄、太阳辐射强、日照时间长等特殊的气象特征。为研究高海拔地区钢-混凝土组合梁日照温度场特征与分布模式,以某钢-混凝土组合梁为实例,确定了适用于高原气象条件的太阳辐射计算模型,对青藏高原大气透明度系数进行分析;建立了有限元模型,对典型时段的日照温度场进行时变分析;对高海拔地区铁路设计的板厚温差荷载模式进行了讨论。研究结果表明:钢-混凝土组合梁日照温差主要分布在混凝土板厚度范围内,钢梁的温度在腹板高度方向上的温度梯度较小;由于钢梁的存在,钢梁中心线处的板厚温差大于桥面中心线处的板厚温差;钢-混凝土组合梁板厚温差符合指数模型分布;钢-混凝土组合梁板厚温差与大气透明度系数成线性关系。The Qinghai Tibet Plateau is characterized by thin air,strong solar radiation and long sunshine time.To study the characteristics and distribution pattern of sunshine temperature field of steel-concrete composite girder in high altitude area,a case-study was conducted in this article.A solar radiation calculation model suitable for the plateau meteorological conditions was determined,and the atmospheric transparency coefficient of the Qinghai Tibet Plateau was calculated.A finite element model was established to analyze the time-varying sunshine temperature field in typical periods.Finally,the slab thickness temperature difference of railway structure in high altitude area was discussed.The results show that the sunshine temperature difference of steel-concrete composite girder is mainly distributed in the concrete slab while the temperature gradient of steel girder in the direction of web height is small.Because of the existing of steel girder,the slab thickness temperature difference at the centerline of the steel girder is greater than that at the centerline of the bridge.The slab thickness temperature difference in steel-concrete composite girder conforms to the exponential model distribution.The slab thickness temperature difference in steel-concrete composite girder is linearly proportional to the atmospheric transparency coefficient.

关 键 词：钢-混凝土组合梁 温度场 大气透明度 板厚温差 高海拔地区 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]