猫头型输电塔在覆冰与风荷载下的动力稳定  

Dynamic Stability of Cathead Transmission Tower under Ice and Wind Load

作　　者：严波 盛金马 姜克儒 齐益[3] 赵宝成[3] 龚祯佳 YAN Bo;SHENG Jin-ma;JIANG Ke-ru;QI Yi;ZHAO Bao-cheng;GONG Zhen-jia(State Grid Anhui Electric Power Co. Ltd., Hefei 230061, China;Economic and Technological Research Institute, State Grid Anhui Electric Power Co. Ltd., Hefei 230061, China;School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China)

机构地区：[1]国网安徽省电力有限公司,合肥230061 [2]国网安徽省电力有限公司经济技术研究院,合肥230061 [3]苏州科技大学土木工程学院,苏州215011

出　　处：《科学技术与工程》2021年第26期11166-11175,共10页Science Technology and Engineering

基　　金：江苏省高等学校自然科学研究面上项目(20KJB560018);江苏省结构工程重点实验室开放课题(ZD1903)。

摘　　要：利用增量动力分析法和弧长法有限元分析了猫头型输电塔的动力稳定,对比了输电塔静力与动力失稳前、后的受力特征,分析了覆冰厚度和风向角对输电塔动力失稳的影响。通过静力失稳与动力失稳塔顶侧移比相等原则得到了不同覆冰厚度及风向角下,输电塔动力失稳临界平均风速。结果表明:杆塔失稳主要由塔身底部主材屈服、斜材面外变形增大引起;随着覆冰厚度的增加,杆塔静力失稳与动力失稳的差别加大,杆塔在风力动载下的塔顶侧移显著增加,动力失稳临界平均分风速显著减小。输电塔在风荷载作用下的整体稳定性应考虑动力效应及覆冰条件的不利影响。The dynamic stability of cathead transmission towers was studied utilizing incremental dynamic analysis combining with arc length method.The pre-instability and post-instability behaviors of transmission tower under static loading and dynamic loading were investigated.The effects of ice thickness and wind attack angle on the dynamic instability of transmission tower were analyzed.The critical wind speeds of dynamic instability of transmission tower were captured by the principle of equal top drift ratio of tower.The analysis results indicate that the instability of transmission tower is triggered by the column yielding and brace buckling.The differences between static and dynamic instability become remarkable when the ice loading increases.Increasing the ice thickness increases the top drift ratio and decreases the critical wind speed of tower.The adverse effects of dynamic responses and ice load on the instability of transmission tower shall be taken into account in the design.

关 键 词：猫头型输电塔 动力失稳 风荷载 覆冰荷载 

分 类 号：TM753[电气工程—电力系统及自动化]