某大厦楼顶桅杆天线涡激振动控制分析
引用文献：
李钧睿 周云 林超伟 梁秋河 周和鸿. 某大厦楼顶桅杆天线涡激振动控制分析[J]. 建筑结构，2023，48（04）：135-142.
LI Junrui ZHOU Yun LIN Chaowei LIANG Qiuhe ZHOU Hehong. Analysis on vortex-induced vibration control of mast antenna of a super high-rise building[J]. Building Structure，2023,48（04）：135-142.
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；
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Analysis on vortex-induced vibration control of mast antenna of a super high-rise building
Abstract: A super high-rise building vibrated abnormally when there was no earthquake or strong wind, and people inside the building felt strong vibration. The preliminary conjecture is that the vortex-induced vibration(VIV) occurred in the mast antenna of the roof, which initiates the high-order modal resonance in the main structure. The wind speed at the top of the mast antenna was calculated and compared with the critical wind speed of the VIV of each modal. It was determined that the VIV with a frequency of 2.11Hz occurred in the mast antenna under the specific wind field conditions, which is generally consistent with the field measured results. The finite element models were established, and the VIV loads of the mast antenna were calculated and input into the model in the form of sine wave to analyze the dynamic response of the main structure under different input angles. The results show that the VIV of the mast antenna with a frequency of 2.11Hz initiates the high-order modal resonance of the main structure; the maximum dynamic responses were obtained when the sine wave loads were input along 135° or 315°; the dynamic responses fluctuate along the height of the main structure; the peak acceleration responses meet the limit of the Chinese code but are greater than the H-90 limit of the Japanese code for wind vibration comfort, causing the significant vibration feeling. Three vibration control schemes were designed for the mast antenna. Sine wave loads with various frequencies were input along the mast antenna to analyze the sensitivity of the mast antenna to sine wave load frequency. The results show that all three vibration control schemes can effectively reduce the dynamic responses of the main structure and the mast antenna, and the most undesirable frequency of sine wave load is increased, 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
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