考虑无砟轨道遮盖效应的简支箱梁温度场研究  

Study on the Temperature Field of Simply Supported Box Girder Bridges Considering Ballastless Track Sheltering Effect

作　　者：闫斌[1,2] 田江浩 付贺鑫 程瑞琦 YAN Bin;TIAN Jianghao;FU Hexin;CHENG Ruiqi(Central South University,Changsha,Hunan 410075,China;National Engineering Research Center of High speed Railway Construction Technology,Changsha,Hunan 410075,China;Hunan Provincial Communications Planning,Survey and Design Institute Co.Ltd,Changsha,Hunan 410075,China)

机构地区：[1]中南大学,长沙410075 [2]高速铁路建造技术国家工程研究中心,长沙410075 [3]湖南省交通规划勘察设计院有限公司,长沙410075

出　　处：《铁道工程学报》2025年第3期30-35,共6页Journal of Railway Engineering Society

基　　金：国家自然科学基金面上项目(52278470);中国中铁股份有限公司科技研究开发计划(2022-重大-04)。

摘　　要：研究目的:混凝土桥梁在与外界环境的热交换过程中,受环境温度及太阳辐射作用,其内部温度场呈非线性分布。为研究考虑无砟轨道遮盖效应的简支箱梁温度场分布特征,建立考虑日期、时间和外界温度的热力学仿真模型,利用试验数据验证计算结果的准确性,分析日照作用下不同时间箱梁温度场的变化情况,探讨无砟轨道遮盖效应对简支箱梁温度场的影响范围及影响规律。研究结论:(1)在日照作用下,箱梁桥上的日温差变化幅度与距离表面的远近密切相关,越靠近表面,其变化幅度越大;(2)考虑无砟轨道时,无砟轨道下部梁体的温度普遍降低,梁体同一位置温度降低的最大幅度可以达到20.19%;(3)随着与无砟轨道距离的增加,遮盖效应对箱梁温度的影响逐渐减弱;(4)在箱梁顶板横向距离中心线4.86m以内,无砟轨道的遮盖效应影响较大,竖向受影响均较大;腹板上距离顶板表面2.12m以内,无砟轨道的遮盖效应影响较大;底板受无砟轨道遮盖效应的影响较小;(5)无砟轨道遮盖效应对梁体日温度变化幅度的影响规律与温度变化分布规律相似,竖向范围内顶板受影响最大,横向范围内主要影响无砟轨道正下方梁体;(6)本研究结果可为无砟轨道设计中优化梁体温度效应控制提供理论依据。Research purposes:Concrete bridges undergo non-linear temperature distribution within their internal temperature field during heat exchange with the external environment,influenced by ambient temperature and solar radiation.To investigate the temperature distribution characteristics of simply supported box girder bridges considering the effect of ballastless track cover,a thermodynamic simulation model was established,taking into account date,time,and external temperature.The accuracy of the computed results was validated using experimental data.The variation of box girder temperature fields at different times under sunlight exposure was analyzed,and the impact range and patterns of the ballastless track cover's effect on the temperature field of simply supported box girders were explored.Research conclusions:(1)Under sunlight exposure,the amplitude of daily temperature difference on the bridge deck varies closely with the distance from the surface,with greater variations closer to the surface.(2)When the ballastless track is considered,the temperature of the beam body under the ballastless track is generally reduced,and the maximum temperature reduction of the beam body at the same position can reach 20.19%.(3)As the distance from the ballastless track increases,the influence of the cover effect on the girder temperature gradually weakens.(4)Within 4.86 m lateral distance from the centerline of the girder top slab,the ballastless track cover effect is significant,affecting both vertically and horizontally to a large extent.Within 2.12 m distance from the top slab surface on the web,the effect of the ballastless track cover is significant,while the effect on the bottom slab is relatively small.(5)The influence pattern of the ballastless track cover's effect on the temperature change of the girder body is similar to the distribution pattern of temperature change.The top slab is most affected vertically,while horizontally,the main impact is on the girder body directly beneath the ballastless track.(6)The findings o

关 键 词：简支梁 日照作用 热力学分析 无砟轨道 遮盖效应 

分 类 号：U213.244[交通运输工程—道路与铁道工程]