高聳鋼結構觀光塔風致響應現場實測研究
首發時間:2023-07-31
摘要:為了評估高層建筑在服役期間的安全性能,采用有限元方法與智能監測手段相結合,以北疆明珠塔為例研究高層建筑在風致響應作用下的動力特性。通過監測常態風作用下結構頂層處的振動速度等,利用快速傅里葉變換(fast Fourier transform,FFT)法識別結構固有頻率,并分析了常態風對結構動力特性的影響。結果表明:北疆明珠塔結構在常態風作用下的振動幅值均小于相應規范限值,滿足舒適度及設計標準要求;彎曲頻率隨速度幅值的增大而降低,而扭轉頻率與速度幅值的相關性較低;結構阻尼比與速度幅值的相關性較低。
關鍵詞: 觀光塔 風致振動 現場實測 快速傅里葉變換 參數識別
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Field measurement research on wind-induced response of towering steel structure sightseeing tower
Abstract:In order to evaluate the safety performance of high-rise buildings during service, finite element method and intelligent monitoring method were combined to study the dynamic characteristics of high-rise buildings under wind-induced response taking Beijiang Pearl tower as an example. By monitoring the vibration velocity at the top layer of the structure under the impact of normal wind, the natural frequency of the structure was identified by the fast Fourier transform (FFT) method, and the influence of normal wind on the dynamic characteristics of the structure was analyzed. The results show that the structure of the Beijiang Pearl tower exhibits less vibration amplitudes than the corresponding standard limits under normal wind, which meets the comfort and design standard requirements. The bending frequency decreases with the increase of the velocity amplitude, while the correlation between the torsional frequency and the velocity amplitude is low. The damping ratio of structure has low dependence on the velocity amplitude.
Keywords: sightseeing tower wind-induced vibration field measurement fast Fourier transform parameter identification
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