考虑低温与极端雪荷载耦合作用下大跨高铁站房屋盖力学性能分析  

Mechanical Performance Analysis of Long Span High-speed Railway Station Roofs Considering the Coupling Effect of Low Temperature and Extreme Snow Load

作　　者：宋林琳 魏明阳 张学明 高鹏远 张魁杰 李勇[1] SONG Linlin;WEI Mingyang;ZHANG Xueming;GAO Pengyuan;ZHANG Kuijie;LI Yong(Ministry of Education Key Laboratory of Roads and Railway Engineering Safety Control,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;China Railway Shanghai Design Institute Group Co.,Ltd.,Shanghai 200070,China;China Railway Construction Group Co.,Ltd.,Beijing 100040,China)

机构地区：[1]石家庄铁道大学道路与铁道工程安全保障教育部重点实验室,石家庄050043 [2]中铁上海设计院集团有限公司,上海200070 [3]中铁建设集团有限公司,北京100040

出　　处：《铁道标准设计》2025年第1期166-176,共11页Railway Standard Design

基　　金：河北省重点研发计划项目(21375403D,20375410D);中铁建设集团有限公司科研项目(2020039QT2021005,2020039QT2021007)。

摘　　要：高铁站房钢屋盖对温度敏感且超静定次数较多,在寒区低温和积雪作用下容易造成垮塌。为探究高铁站房异形屋盖结构在低温及极端雪荷载耦合作用下的力学性能,以东北某地区高铁站房为背景,采用有限元软件ABAQUS建立屋盖模型,利用现场监测数据验证了有限元模型的准确性。研究设计温差对屋盖结构的影响,考虑场址处近年极端低温天气频现,分析极端温差下屋盖受力。基于不同设计雪荷载分布方式,开展屋盖结构的受力分析,进而考虑寒区极端雪荷载,并探究极端雪荷载与极端温差耦合下的受力状态。结果表明:屋盖两侧弧形边缘部分杆件不同温差下应力变化显著,对温度变化较为敏感,极端温差下需要重视此区域内杆件应力变化;站房屋盖设计时,对于存在天窗的屋盖结构,应重视因天窗与周围屋面高度差而产生的不均匀雪荷载对结构内力的影响;极端雪荷载作用下,屋盖最大应力杆件接近屈服,最大竖向位移也接近规范容许值;考虑极端雪荷载与极端降温耦合相比设计雪荷载与设计温差耦合屋盖最大拉应力、最大下绕位移分别增大47.1%、50.2%,且应力已经超过钢材设计强度,在寒区大跨高铁站房钢屋盖设计时应充分考虑二者耦合的影响。The steel roof of the high-speed railway passenger station is sensitive to temperature and has a high number of statically indeterminate times,which tends to cause collapse under low temperatures and snow cover in cold regions.To explore the mechanical performance of the irregular roof structure of a high-speed railway passenger station under the coupled effects of low temperatures and extreme snow loads,a finite element model of the roof is established by ABAQUS based on a high-speed railway station in a region of northeast China.The accuracy of the finite element model is verified by on-site monitor data.The impact of design temperature differences on the roof structure is studied,considering the frequent occurrence of extremely low-temperature weather on-site in recent years,and then the stress on the roof under extreme temperature differences is analyzed,considering different design snow load distribution methods.Moreover,the study explores the impact of extreme snow loads in cold regions and the stress state under the coupling of extreme snow loads and temperature differences.The results show that the stress changes in the curved edges of the roof are significant under different temperatures,and are more sensitive to temperature changes.Extreme temperature differences require attention to the stress changes of the members in this area.When designing the roof structure of a station building,attention should be paid to the influence of uneven snow loads caused by the height difference between the skylight and the surrounding roof on the internal force of the structure.Under extreme snow loads,the maximum stress bars of the roof is close to yielding,and the maximum vertical displacement is also near the allowable value in the specifications.Considering the coupling of extreme snow load and extreme cooling,the maximum tensile stress and maximum vertical displacement of the designed snow load and temperature difference coupling roof increase by 47.1%and 50.2%respectively,and the stress exceeds the designed steel

关 键 词：高铁站房 屋盖 温差作用 雪荷载 耦合作用 力学性能 

分 类 号：U291.6[交通运输工程—交通运输规划与管理] TU391[交通运输工程—道路与铁道工程]