下击暴流作用下高速铁路全封闭声屏障风荷载特性研究  

Study on Wind Load Characteristics of Fully Enclosed Sound Barrier for High Speed Railway Under the Action of Downburst

作　　者：李玉学 吕佳健[1] 白昕川 LI Yuxue;LYU Jiajian;BAI Xinchuan(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;Key Laboratory of the Ministry of Education for Road and Railway Engineering Safety Assurance,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]河北省风工程和风能利用工程技术创新中心,河北石家庄050043 [3]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《石家庄铁道大学学报(自然科学版)》2025年第1期43-49,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(51278314);河北省自然科学基金(E2019210031);中央引导地方科技发展资金项目(206Z5401G):北京交通大学“结构风工程与城市风环境北京市重点实验室”开放课题(2023-1)。

摘　　要：高速铁路全封闭声屏障作为典型的长距离线状风敏感结构,其遭遇下击暴流袭击的几率较大。为深入理解下击暴流作用下结构的风荷载特性,基于冲击射流模型建立下击暴流风场,据此分析下击暴流风场距离全封闭声屏障中心不同距离r、下击暴流不同移动角度路径θ和不同地面粗糙度z_(0)下高速铁路全封闭声屏障结构表面风荷载分布特性,在此基础上,给出了结构抗下击暴流设计建议。分析结果表明,当r=0、z_(0)=0时,结构表面风压系数整体较大,最大值1.02出现在结构迎风侧板中部;当r=D_(jet)(D_(jet)为射流管直径)、z_(0)=0时,结构表面风压系数整体较小,最大值0.68出现在结构迎风面中部;相比于θ=90°,当θ=0°时,结构表面来流端风压系数显著增大,尾流端风压系数显著减小;随着z_(0)的增加,结构迎风面风压系数减小,背风面风压系数绝对值也减小,且迎风面中部区域风压系数衰减显著;下击暴流移动过程中结构侧板上方流场显著改变,其表面风压系数变化幅度较大,建议全封闭声屏障抗下击暴流设计时应加强侧板及其与顶板拐角处的连接。As a typical long-distance linear wind-sensitive structure,the full enclosed sound barrier for high-speed rail has a higher probability of being struck by a downburst.In order to deeply understand the wind load characteristics of the structure under the action of a downburst,a downburst wind field based on the impact jet model was established.The surface wind load distribution characteristics of the fully enclosed sound barrier structure were analyzed at different distances r from the center of the structure,different moving angles of the downburst pathθ,and different ground roughness z_(0) of the downburst wind field.Based on this,design suggestions for the structure’s resistance to downbursts were given.The analysis results show that when r=0 and z_(0)=0,the overall wind pressure coefficient on the structure surface is larger,and the maximum value of 1.02 appears in the middle of the structure’s windward side panel.When r=D_(jet)(D_(jet) is the diameter of the jet pipe)and z_(0)=0,the overall wind pressure coefficient of the structure surface is small,with the maximum value of 0.68 appearing in the middle of the structure facing the wind;Compared withθ=90°,whenθ=0°,the wind pressure coefficient at the leading edge of the structure surface is significantly increased,and the wind pressure coefficient at the trailing edge is significantly decreased;As z_(0) increases,the wind pressure coefficient at the front of the structure facing the wind decreases,the absolute value of the wind pressure coefficient at the back of the structure facing the wind also decreases,and the wind pressure coefficient at the central region of the front face of the structure decreases significantly;The flow field above the side panel of the structure changes significantly during the movement of the downburst,and the wind pressure coefficient on its surface changes significantly.It is suggested that the design of the fully enclosed sound barrier’s resistance to downbursts should be strengthened at the connection between the side

关 键 词：下击暴流 全封闭声屏障 风荷载特性 数值模拟 风压系数 

分 类 号：U213.8[交通运输工程—道路与铁道工程]