单钢管避雷针高柔结构横风向风致响应研究  

Study on Cross-wind Response of Single Steel Pipe Lightning Rod High Flexible Structure

作　　者：焦晋峰 苏亚兰[2] 邓婕 付兴强 陈鹏程 JIAO Jinfeng;SU Yalan;DENG Jie;FU Xingqiang;CHEN Pengcheng(Department of Architecture,Lyuliang University,Lyuliang 033000,China;College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]吕梁学院建筑系,山西吕梁033000 [2]太原理工大学土木工程学院,太原030024

出　　处：《太原理工大学学报》2023年第3期473-481,共9页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(52278198);山西省自然科技研究基金资助项目(202203021211184),山西省基础研究计划资助项目(202103021223105)。

摘　　要：单钢管避雷针结构横截面为圆形且基频较低,在运营过程中容易发生风振现象,采用双向流固耦合方法对其进行3维数值风洞模拟,探讨7种风速下钢管避雷针结构受力性能及风振响应,并与现行的国家规范条文对比。分析结果表明:在典型风速下避雷针结构两侧所受横风向风压力最大为1.03 kPa,是顺风向风压力的1.72倍,且在不同节段钢管连接处风压力突变现象显著;当风速大于10 m/s时,避雷针结构所受横风向风压大于规范提供的风荷载标准值,两者相差42%,且结构顶端位移相差30.6%;当风速大于20 m/s时,避雷针结构横风向振动频率与避雷针结构高阶自振频率接近,避雷针结构易发生高阶弯曲振动,存在安全隐患。For single steel pipe lightning rod structure that has a circular cross section and low fundamental frequency,wind vibration phenomenon is easy to occur in the operation process.The two-way fluid-structure coupling method was used to conduct three-dimensional numerical wind tunnel simulation,and the mechanical properties and wind vibration response of steel pipe lightning rod structure under seven wind speeds were discussed.The outcomes were and compared with current national standard provisions.The analysis results show that the maximum transverse wind pressure on both sides of the lightning rod structure is 1.03 kPa under typical wind speed,which is 1.72 times the downwind wind pressure,and the abrupt change of wind pressure is significant at the connection of steel pipe in different sections.When the wind speed is greater than 10 m/s,the transverse wind pressure of the lightning rod structure is greater than the standard wind load value provided by the specification,the difference between the two is 42%,and the displacement of the top of the structure is 30.6%.When the wind speed is greater than 20 m/s,the transverse vibration frequency of the lightning rod structure is close to the highorder natural vibration frequency of the lightning rod structure,and the lightning rod structure is prone to produce high-order bending vibration,which has safety risks.

关 键 词：双向流固耦合 单钢管避雷针结构 三维数值风洞模拟 横风向风压 风振响应 

分 类 号：TU347[建筑科学—结构工程]