列车风引起的张弦梁雨棚振动分析  

Analysis of the Canopy Vibration of Beam String Structure due to Train Wind

作　　者：米宏广[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300251

出　　处：《铁道工程学报》2014年第12期77-82,共6页Journal of Railway Engineering Society

摘　　要：研究目的:大跨度张弦梁结构形式简洁,受力合理,建筑造型优美,但具有柔度较大、重量轻的特点,属于风敏感结构。列车高速过站时,列车风压力可能对建筑物的局部产生较为强烈的作用,使下弦张拉弦索刚度退化,改变结构的受力性能或引起结构共振,对结构产生不利的影响。本文以京沪高速铁路济南西客站无站台柱张弦梁雨棚为例,分析列车高速通过引起无站台柱雨棚上的列车风压力和变化规律以及对雨棚结构的影响,为设计提供依据。研究结论:通过研究可以得出如下结论:(1)列车风压力沿高度方向衰减较快,沿宽度方向近似线性变化;(2)列车风压力引起的张弦梁的Z、Y的位移及钢梁及索的应力变化幅度均较小;(3)列车风压力引起的雨棚结构的风致振动频率与结构自振频率相差较大,不会引起共振;(4)本研究成果对大跨度雨棚等站场设施的设计可提供指导。Research purposes： The large span beam string structure which has large flexibility, light weight, is wind sensitive structure. The train passed through the station, the train wind pressure may act locally to building strong, so that the bottom chord tension chord cable stiffness degradation, change the structure stress performance or cause the structural resonance, adversely affect the strueture. In this paper, as the no station column canopy of beam string structure of Jinan West Railway Station of Beijing - Shanghai High Speed Railway for example, it analyzed the cause of no station pole canopy on the train wind pressure and the change law and influence on canopy structure when train travels at high speed. Research conclusions： Through the research, we can draw the following conclusions： （ 1 ） The pressure of train windattenuates rapidly in vertical direction and decreases linearly in horizontal direction. （2） The displacement in Z and Y direction of the string beam changes little, as well as the stress in cable and steel beam. （3） Frequency of the platform awning structure vibration caused by train wind distinguishes from natural frequency of vibration of the structure, resonance would not happen. （4） The research results can provide a guidance to design of facilities in train station yard, such as large -span canopy and so on.

关 键 词：张弦梁 无站台柱雨棚 列车风 

分 类 号：U291.19[交通运输工程—交通运输规划与管理]