摘要
研究目的:为研究正线列车高速过站对跨线天桥产生的列车风效应,本文对商合杭铁路寿县站跨线天桥在正线列车不同车速通过时的表面风压分布进行实测,并通过CFD模拟分析对比验证,拟通过数据分析得出跨四线天桥在单线列车通过时的风压分布公式,为铁路站场跨线天桥设计列车风荷载取值提供理论参考。研究结论:(1)通过现场实测与数值分析的手段,得出高速正线列车在通过跨线天桥时的风压分布规律,即在顺桥向为行驶轨道区域大,远离轨道方向小,横桥向为中间区域强两侧弱;(2)天桥表面风压激励在时间域可采用车头进入天桥过程和车尾离开天桥过程两个脉冲作用简化输入,在空间域可以简化为极值风压同步输入;(3)本研究成果主要应用于正线高速列车通过时的铁路站场跨线天桥设计领域。
Research purposes: In order to study the train-induced wind effect, the wind pressure distribution on the surface of the over-line pedestrian bridge at Shouxian Station of Shangqiu-Hefei-Hangzhou Railway when the main line trains passing at different speeds was measured, and it was verified by CFD simulation analysis in this paper. Through numerical analysis, the wind pressure distribution formula of the pedestrian bridge across four lines is obtained when the single line train passes, which can provide a theoretical reference of the train-induced wind load value for the over-line pedestrian bridge. Research conclusions:(1) By means of actual measurement and numerical analysis, the law of wind pressure distribution on the overpass during the high-speed trains passing through the overpass was obtained which the wind pressure of the driving track area is greater than the other areas along the bridge direction, and the wind pressure in the middle area is greater than the sides area in the transverse bridge direction.(2) The wind pressure excitation on the surface of the overpass in the time domain can be simplified by two pulse effects of the vehicle head during the overpass and the vehicle tail leaving the overpass and in the spatial domain can be simplified to the extreme wind pressure value as synchronous input.(3) The research results can provide references for the field of the over-line pedestrian bridge design when the main line trains passing in the railway station.
作者
沈磊
SHEN Lei(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430063,China)
出处
《铁道工程学报》
EI
北大核心
2021年第12期89-94,107,共7页
Journal of Railway Engineering Society
基金
中铁第四勘察设计院集团有限公司课题(2018K074)。
关键词
跨线天桥
列车风
CFD
风压分布
over-line pedestrian bridge
train-induced wind
CFD
wind pressure distribution
