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(1 廣州大學土木工程學院, 廣州 510006;2 柏濤國際工程設(shè)計顧問 (深圳) 有限公司, 深圳 518031)
摘要: 某超高層大廈在無地震和強風時發(fā)生異常振動,大廈內(nèi)人員振感強烈. 初步判斷是樓頂桅桿天線發(fā)生渦激共振,并引發(fā)主體結(jié)構(gòu)高階振型共振效應. 計算桅桿天線頂部風速并與各階振型的渦激振動臨界風速對比,判斷桅桿天線在特定風場條件下發(fā)生頻率為 2. 11Hz 的渦激共振,與現(xiàn)場實測結(jié)果基本吻合. 建立大廈結(jié)構(gòu)的有限元模型,計算桅桿天線渦激共振荷載并以正弦波荷載的形式輸入到模型中,分析不同輸入角度下主體結(jié)構(gòu)的動力響應情況. 結(jié)果表明,桅桿天線 2. 11Hz 的渦激共振引發(fā)主體結(jié)構(gòu)高階振型共振響應;沿 135°或 315°輸入正弦波荷載時動力響應最大;主體結(jié)構(gòu)的動力響應沿樓層呈波動形態(tài);峰值加速度響應滿足中國規(guī)范限值,但大于日本風振舒適度規(guī)范 H-90 級別限值,導致了顯著的振感. 對桅桿天線設(shè)計了三個振動控制方案,輸入不同頻率的正弦波荷載,分析改造后的桅桿天線對正弦波荷載頻率的敏感性. 結(jié)果表明,所提出的三個方案均能有效減小主體結(jié)構(gòu)和桅桿天線的動力響應,且提高了最不利正弦波荷載頻率,降低了桅桿天線發(fā)生渦激共振的概率.
關(guān)鍵詞: 超高層結(jié)構(gòu); 桅桿天線; 渦激共振; 振動控制; 風振舒適度
中圖分類號:TU355,TU973. 213 文獻標志碼:A 文章編號: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:李鈞睿,碩士,主要從事結(jié)構(gòu)振動控制研究,Email:a2332a@ 126. com.
[引用本文] 李鈞睿,周云,林超偉,等. 某大廈樓頂桅桿天線渦激振動控制分析[J]. 建筑結(jié)構(gòu),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.
