下击暴流作用下羊角型输电塔的风振动力响应与倒塌破坏分析  

Wind-Induced Dynamic Response and Collapse Failure of Sheep-Horn Transmission Tower Under Downburst Effect

作　　者：韩承永 吴磊 胡晨 王静峰[3,4] 胡培芳 刘用 HAN Chengyong;WU Lei;HU Chen;WANG Jingfeng;HU Peifang;LIU Yong(State Grid Anhui Zhongxing Electric Power Design Institute Co.,Ltd.,Hefei 230022,China;Economic&Technical Research Institute of State Grid Anhui Power Co.,Ltd.,Hefei 230022,China;College of Civil Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Provincial Key Laboratory of Civil Engineering Structures and Materials,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]国网安徽众兴电力设计院有限公司,合肥230022 [2]国网安徽省电力有限公司经济技术研究院,合肥230022 [3]合肥工业大学土木与水利工程学院,合肥230009 [4]合肥工业大学土木工程结构与材料安徽省重点实验室,合肥230009

出　　处：《建筑钢结构进展》2024年第8期78-86,共9页Progress in Steel Building Structures

基　　金：国家自然科学基金(52278170);教育部新世纪人才支持计划(NCET-12-0838);国网安徽众兴电力设计院有限公司项目(B6128122SJ02)。

摘　　要：输电塔是典型的风敏感结构,易受下击暴流极端强风的影响,导致输电塔倒塌、线路受损等风害故障频发,造成巨大的经济损失。为分析下击暴流作用下输电塔倒塌破坏的原因,根据马鞍山地区一次下击暴流事故中的实测气象数据,以事故中整体倒塌破坏的羊角型直线塔为典例,建立“一塔两线”有限元分析模型,分析下击暴流0°、45°、60°、90°风向角作用下输电塔体系的动力响应,探究下击暴流不同风向角作用下羊角型直线塔-线体系的受力特点、薄弱部位及破坏机理。研究结果表明:90°风向角是直线塔-线体系抗下击暴流作用的最不利工况,是导致直线塔-线体系倒塌破坏的主要原因。下击暴流作用下羊角型直线塔-线结构体系的倒塌破坏是塔腿主、斜材失稳所引起,在抗下击暴流设计时应加强塔腿部位。Transmission towers are typical wind-sensitive structures,vulnerable to extremely strong winds of the downburst,frequently resulting in wind damage faults such as the collapse of towers and damage of transmission lines.It causes huge economic losses.In order to analyze the collapse and destruction of the transmission tower under the downburst,this paper adopted the measured meteorological data from a downburst accident in the Ma'anshan area,and took a sheep-horn tangent tower with overall collapse in the accident as an example.The finite element model of“one tower and two lines”was established to analyze the wind-induced dynamic response of the sheep-horn tangent tower under wind angles of 0°,45°,60°and 90°of downburst,and to explore the mechanical characteristics,weak position and failure mechanism of sheep-horn tangent tower-line system under the different wind angles of downburst.The research results show that the wind angle of 90°of downburst is the worst condition for tangent tower-line system,and this is the main reason for its collapse.Under the downburst,the collapse and failure is caused by the instability of tower legs and inclined materials,so the tower legs should be strengthened in the design of anti-downburst.

关 键 词：下击暴流 羊角型直线塔-线体系 风向角 风振响应 倒塌破坏 

分 类 号：TU312.1[建筑科学—结构工程] TM75[电气工程—电力系统及自动化]