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題名 | 高層建築物與邊界層流場之氣動力之互制現象=Wind-Structure Interaction of a High-Rise Building in Boundary Layer Flows |
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作 者 | 陳若華; 鄭啟明; 盧博堅; | 書刊名 | 中國土木水利工程學刊 |
卷期 | 9:2 1997.06[民86.06] |
頁次 | 頁271-279 |
分類號 | 440.137 |
關鍵詞 | 高層建築; 氣動力阻尼; 橫風向反應; High-rise building; Aerodynamic damping; Acrosswind response; |
語文 | 中文(Chinese) |
中文摘要 | 本文利用邊界層流場中三維方柱的強制振動實驗,探討高層建築橫風向振動與流 場間的互制現象。本文中振動導納外力是由片段線性的氣動力勁度及氣動力阻尼所組成。經 由氣動實驗得到氣動力勁度及氣動力阻尼後,以靜止模型風力頻譜配合振動引發的氣動力參 數,合併估算結構位移反應,並與氣彈力實驗結果比較。結果顯示:對於在平坦地形流場中 的結構物,其位移反應受流場互制現象影響甚鉅。單純以風力頻譜計算位移在高風速下會低 估位移反應。 |
英文摘要 | The aerodynamic characteristics of a single, oscillating, three di-men sional prism in turbulent boundary layer flows are investigated using wind tunnel pressure model. The motion induced force is modeled by piecewise linear aerodynamic stiffness and damping forces. The coeffi-cients of these two aerodynamic forces are obtained by pressure mea-surements of a harmonically driven prism with controlled oscillating fre-quencies and amplitudes. Through the force spectra of stationary model tests, the acrosswind response is calculated and compared with the mea-surements from aeroelastic model tests. Results indicate that significant flow-structure interaction exists in open terr ain flow field. The structural response estimation, on the base of wind loads excluding motion effects, underestimates the structural response in the higher e vlocity range. |
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