(1 广州大学土木工程学院, 广州 510006;2 柏涛国际工程设计顾问 (深圳) 有限公司, 深圳 518031)

摘要: 某超高层大厦在无地震和强风时发生异常振动,大厦内人员振感强烈. 初步判断是楼顶桅杆天线发生涡激共振,并引发主体结构高阶振型共振效应. 计算桅杆天线顶部风速并与各阶振型的涡激振动临界风速对比,判断桅杆天线在特定风场条件下发生频率为 2. 11Hz 的涡激共振,与现场实测结果基本吻合. 建立大厦结构的有限元模型,计算桅杆天线涡激共振荷载并以正弦波荷载的形式输入到模型中,分析不同输入角度下主体结构的动力响应情况. 结果表明,桅杆天线 2. 11Hz 的涡激共振引发主体结构高阶振型共振响应;沿 135°或 315°输入正弦波荷载时动力响应最大;主体结构的动力响应沿楼层呈波动形态;峰值加速度响应满足中国规范限值,但大于日本风振舒适度规范 H-90 级别限值,导致了显著的振感. 对桅杆天线设计了三个振动控制方案,输入不同频率的正弦波荷载,分析改造后的桅杆天线对正弦波荷载频率的敏感性. 结果表明,所提出的三个方案均能有效减小主体结构和桅杆天线的动力响应,且提高了最不利正弦波荷载频率,降低了桅杆天线发生涡激共振的概率.

关键词: 超高层结构; 桅杆天线; 涡激共振; 振动控制; 风振舒适度

中图分类号:TU355,TU973. 213 文献标志码:A 文章编号:1002-848X(2023)04-0135-08

DOI:10. 19701 / j. jzjg. 20211503

Analysis on vortex-induced vibration control of mast antenna of a super high-rise building

LI Junrui1, ZHOU Yun1, LIN Chaowei1,2, LIANG Qiuhe1, ZHOU Hehong1

(1 School of Civil Engineering, Guangzhou University, Guangzhou 510006, China;2 PT International Design Consultants (Shenzhen) Co. , Ltd. , Shenzhen 518031, China)

Abstract: A super high-rise building vibrated abnormally when there was no earthquake or strong wind, and people insidethe building felt strong vibration. The preliminary conjecture is that the vortex-induced vibration (VIV) occurred in themast antenna of the roof, which initiates the high-order modal resonance in the main structure. The wind speed at the top ofthe mast antenna was calculated and compared with the critical wind speed of the VIV of each modal. It was determinedthat the VIV with a frequency of 2. 11Hz occurred in the mast antenna under the specific wind field conditions, which isgenerally consistent with the field measured results. The finite element models were established, and the VIV loads of themast antenna were calculated and input into the model in the form of sine wave to analyze the dynamic response of the mainstructure under different input angles. The results show that the VIV of the mast antenna with a frequency of 2. 11Hzinitiates the high-order modal resonance of the main structure; the maximum dynamic responses were obtained when thesine wave loads were input along 135° or 315°; the dynamic responses fluctuate along the height of the main structure; thepeak acceleration responses meet the limit of the Chinese code but are greater than the H-90 limit of the Japanese code forwind vibration comfort, causing the significant vibration feeling. Three vibration control schemes were designed for the mastantenna. Sine wave loads with various frequencies were input along the mast antenna to analyze the sensitivity of the mastantenna to sine wave load frequency. The results show that all three vibration control schemes can effectively reduce thedynamic responses of the main structure and the mast antenna, and the most undesirable frequency of sine wave load isincreased, which reduces the probability of the VIV in the mast antenna.

Keywords:super high-rise building; mast antenna; vortex-induced vibration; vibration control; wind comfort

第一作者:李钧睿,硕士,主要从事结构振动控制研究,Email:a2332a@ 126. com.

[引用本文] 李钧睿,周云,林超伟,等. 某大厦楼顶桅杆天线涡激振动控制分析[J]. 建筑结构,2023,53(4):135-142. LI Junrui,ZHOU Yun,LIN Chaowei,et al. Analysis on vortex-induced vibration control of mast antenna of a superhigh-rise building [J]. Building Structure,2023,53(4):135-142.