山区大高差耐张段悬垂塔风振响应及抗风性能分析  

Wind Vibration Response and Wind Resistance of Suspension Towers with Large Height Difference in Mountainous Areas

作　　者：庞宇彤 曹枚根 占鹭林 陈长龙 Yutong Pang;Meigen Cao;Lulin Zhan;Changlong Chen(School of Civil Engineering,North China University of Technology,Beijing 100144,China;Wenzhou Electric Power Construction Co.,Ltd.,Wenzhou 325024,China)

机构地区：[1]北方工业大学土木工程学院,北京100144 [2]温州电力建设有限公司,浙江温州325024

出　　处：《钢结构（中英文）》2023年第7期22-28,共7页Steel Construction（Chinese & English）

基　　金：浙江省电力实业总公司科技项目(CF058807002021006)。

摘　　要：输电塔是一类高柔度风敏感结构,尤其是建立在山区的输电线路,铁塔所处位置的地形、地貌差异性大,常出现塔与塔之间高差较大的现象,导致风荷载作用下的塔线体系结构响应复杂。以温州沿海山区某典型大高差输电线路段为研究对象,利用ANSYS软件建立两塔三线有限元模型,开展了裸塔及塔线体系的动力特性研究,分析了裸塔及塔线体系在0°和90°风向角下的风振响应,并进行了设计风速下不同风向角的铁塔抗风性能评估。通过对处于山顶位置的输电塔的风振响应特点及铁塔主材内力的分析,得到了山区大高差输电塔主材应力响应规律,掌握了地形高差对铁塔主材应力的影响特点。研究表明:在水平档距不变的情况下,两塔高差越大,位于高处的铁塔主材应力呈现快速增大趋势,且位于山顶的铁塔较山谷铁塔风致倒塌或损毁的风险更大。Transmission towers are a class of highly flexible wind-sensitive structures,especially for transmission lines established in mountainous areas,where the towers are located in locations with large topographic and geomorphic variability,often with large height differences between towers,resulting in complex structural response of the tower-line system under wind loads.A typical transmission line section with large height difference in the coastal mountains of Wenzhou is used as the research object.Ansys software is used to establish a finite element model of two towers and three lines,and the dynamic characteristics of bare towers and tower line system are studied.The wind vibration response of bare towers and tower line system under 0°and 90°wind angle is analyzed,and the wind resistance of towers with different wind angles under design wind speed is evaluated.By analyzing the wind vibration response characteristics of the transmission tower at the top of the mountain and the internal force of the main material of the tower,the stress response law of the main material of the transmission tower with large height difference in mountainous areas is obtained,and the influence characteristics of the terrain height difference on the stress of the main material of the tower are mastered.The study shows that,in the case of constant horizontal gear distance,the greater the height difference between the two towers,the main material stress in the high tower shows a rapid increase trend,and the risk of wind collapse and damage of the tower located in the top of the mountain tower than that of the valley tower.

关 键 词：山区大高差 输电线路 耐张段 悬垂塔 风振响应 抗风性能 

分 类 号：TM75[电气工程—电力系统及自动化] TU352.2[建筑科学—结构工程]