龙卷风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 Tornado Action

作　　者：李玉学 耿春帅[1] 董阳 LI Yuxue;GENG Chunshuai;DONG Yang(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）》2024年第2期71-79,共9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,其遭遇龙卷风袭击的几率较大。为深入理解龙卷风作用下结构的风荷载特性,以深茂铁路某2 km全封闭声屏障为工程背景,基于Ward型龙卷风模拟器原理建立龙卷风场模型,分析龙卷风距离声屏障中心不同距离r、龙卷风不同移动角度路径和不同地面植被覆盖面积比η下全封闭声屏障结构风荷载特性。结果表明,龙卷风作用下,全封闭声屏障表面风荷载以风压力为主,0°移动路径下、η=0时,结构表面风压整体较大,在r=0处结构表面出现最大负风压系数-1.13,阻力系数C_(F_(x))和升力系数C_(F_(z))出现最不利值,分别为0.27和-0.49;在r/R_(m)=1(R_(m)为龙卷风场涡核半径)处结构表面出现最大正风压系数2.91,力矩系数C_(M_(y))及C_(M_(z))出现不利值,分别为0.44和0.39;全封闭声屏障进行抗龙卷风设计时需要考虑断面的环向压差,建议在结构迎风侧、背风侧和顶部分别取最大正风压极值的60%、40%和最大负风压极值的70%进行组合。The fully enclosed sound barrier of high-speed railway is a typical long-distance linear wind-sensitive structure that frequently faces the possibility of tornado attacks.In order to deeply understand the wind load characteristics of the structure under the action of tornadoes,a tornado field model was established based on the Ward-type tornado simulator principle with 2 km fully enclosed sound barrier on the Shenmao Railway as the subject.The structural wind load characteristics of fully enclosed sound barrier were analyzed accordingly under the different distances r of the sound barrier center from the tornado,the different moving angle paths of the tornado,and different ground vegetation coverage ratioη.The results show that wind pressure is the main wind load on the sound barrier’s surface.Under a 0°movement path withη=0,the structure experiences significant overall wind pressure.The maximum negative wind pressure coefficient of-1.13 occurs at r=0,along with unfavorable drag coefficient C_(F_(x))and lift coefficient C_(F_(z))values of 0.27 and-0.49 respectively;At r/R_(m)=1(where R_(m)is the vortex core radius of the tornado field),the maximum positive wind pressure coefficient is 2.91,while the unfavorable moment coefficients C_(M_(y))and are C_(M_(z))0.44 and 0.39 respectively;When designing the structure to withstand tornadoes,the circumferential pressure difference of the segment should be taken into account.It is recommended to combine 60%and 40%of the maximum positive wind pressure and 70%of the maximum negative wind pressure on the windward side,lee side and top of the structure,respectively.

关 键 词：龙卷风荷载 全封闭声屏障 风压分布 风力系数 体型系数 

分 类 号：U213.8[交通运输工程—道路与铁道工程]