铁路钢桁梁悬索桥日照时空非均匀温度场及其效应精细化分析  

NON-UNIFORM SPATIAL-TEMPORAL FIELD OF RAILWAY SUSPENSION BRIDGE AND DETAILED ANALYSIS OF ITS EFFECT

作　　者：朱颖 郭辉 孙大奇 双妙 ZHU Ying;GUO Hui;SUN Da-qi;SHUANG Miao(China Academy of Railway Sciences Corporation Limited Railway Engineering Research Institute,Beijing 100081,China;State Key Laboratory for Track Technology of High-speed Railway,Beijing 100081,China;State Nuclear Electric Power Planning,Design&Research Institute Co.,Ltd,Beijing 100095,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 [3]国核电力规划设计研究院有限公司,北京100095

出　　处：《工程力学》2024年第12期80-94,共15页Engineering Mechanics

基　　金：国家重点研发计划项目(2021YFB3704400);四川省轨道交通重大科技专项项目(2023ZDZX0030);国家铁路集团科技研究开发计划项目(SY2021G002);中国铁道科学研究院集团重大项目(2021YJ084);中国铁路上海局集团有限公司科研开发课题项目(2021142)。

摘　　要：针对铁路钢桁梁悬索桥日照非均匀温度场及其效应引起的主梁线形变化和轨道长波不平顺问题,该文提出通过包围盒算法和消隐算法,计算不同构件间日照阴影系数,模拟因构件间遮蔽引起的非均匀温度场。通过将瞬态传热分析得到节点温度作为边界条件,计算钢桁梁悬索桥非均匀温度引起的主梁线形变化。以某新建主跨超千米公铁两用悬索桥为例,建立热力耦合模型,分析钢桁梁悬索桥日照非均匀温度场及其效应的时空变化规律。在此基础上,将该文方法得到的主梁关键测点温度值和位移值与该桥健康监测系统实测温度值和专项试验主梁线形实测值进行了比较,验证了该文方法的准确性和适用性。结果表明:该文提出的铁路钢桁梁悬索桥日照非均匀温度场分析方法用于计算悬索桥非均匀温度场及其效应是可行的。同时,钢桁梁悬索桥的结构温度场具有周期性和非均匀特征,构件的温度变化略滞后于环境温度变化;由于日照阴影影响和材料热工参数不同,构件间产生非均匀温度场。此外,环境温度对钢桁梁悬索桥温度效应的影响中,温度作用的短周期效应主要由日照辐射和昼夜温差引起,使钢桁梁产生非均匀温度场;而长周期效应则主要由季节性温度变化所致,引起结构整体升降温。数值计算和实测数据均表明,在考虑日照非均匀温度场条件下,主梁线形计算结果与整体升降温模型有较大差别。对于大跨度铁路钢桁梁悬索桥,为更好保持施工期桥梁线形和运营期列车运营性能,需要考虑日照非均匀温度场对桥梁结构温度场及其效应的影响。To investigate the non-uniform temperature field caused by solar radiation and its effect on railway suspension bridge,a method is proposed in this paper to calculate the non-uniform temperature field of bridge components caused by shading among different components.By taking the node temperature obtained from the heat conduction as the boundary condition,the effects of the main truss displacement caused by the non-uniform temperature are calculated.Taking a new railway suspension bridge as an example,the coupled thermomechanical model is used to analyze the time-space changing spectrum of the temperature field and its effect on the railway suspension bridge.The accuracy and applicability of the proposed method are verified by comparing the simulated results of temperature and displacement with the measured data.The results show that it is feasible to calculate the non-uniform temperature field and analyze its effect on truss suspension bridge by the proposed method.At the same time,the temperature field of the truss suspension bridge has the characteristics of periodicity and non-uniformity,and the temperature variation of the bridge components lags slightly behind that of the environment.Due to the influence of sunshine shadow and different thermal parameters of materials,nonuniform temperature field is generated among components.The temperature effect on steel suspension bridge is affected by ambient temperature.The short-period effect is mainly caused by sunshine radiation and diurnal temperature difference,which results in non-uniform temperature field of main truss.The long period effect is mainly due to the seasonal temperature change,which causes the overall temperature change of the structure.Both the numerical results and the measured data show that there is a significant difference between the overall temperature model and the non-uniform temperature field model.In order to better maintain the bridge alignment and the high speed train operating performance,the influence of sunshine non-uniformity on th

关 键 词：钢桁梁悬索桥 太阳辐射 日照阴影 温度场 桥梁线形 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]