高樓結構裝設調和液柱阻尼器減振效應之風洞實驗研究

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Title:	高樓結構裝設調和液柱阻尼器減振效應之風洞實驗研究
Authors:	林世陞;Chin-Bi Lin
Contributors:	土木工程研究所
Keywords:	高層建築;氣動力效應;調和液柱阻尼器;high-rise buildings;aerodynamic effect;TLCD
Date:	2000-07-17
Issue Date:	2009-09-18 17:06:19 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	摘要近年來，國內出現大量的高層建築，這些高樓結構物，有別於傳統的鋼筋混凝土建築，具有質量輕、強度高、高寬比大、自然振動頻率低與阻尼低之特性，對風敏感性增加，使得風力作用成為地震之外，在結構設計時必須考慮的重要因素，特別是位於西太平洋颱風區，風害頻繁的台灣。高層結構物振動與紊流風場之間的互制現象是一個相當複雜的問題，到目前為止，並無適當的理論或數值模式可準確地預測，工程界仍仰賴風洞模型實驗，配合實地的風場資料來評估結構物受風力的動態反應。本研究將裝設調和液柱阻尼器高樓結構模型置於邊界層風場中，量測結構物在不同風速時，其順、橫風向風力與結構反應的時間歷時。此系統可視為二自由度之運動方程式，以氣動力阻尼係數修正此方程式，由Davenport 順風向與Ohkuma & Kanaya 橫風向風力頻譜，利用數值方法計算系統之氣動力反應、轉換函數與均方根反應。整合風洞實驗與理論分析的結果，建立包括風場特性、結構外型、結構特性與調和液柱阻尼器特性之分析模式，並對調和液柱阻尼器的效用進行評估，以瞭解其對結構氣動力效應抑制的程度。藉由本研究可瞭解結構物與風場之互制現象以及結構物受風之氣動力反應，並結合調和液柱阻尼器，達到改善結構物抗風特性的目的，可更精確地建立結構物受風力之反應模式，希望對國內結構耐風設計提供一參考準則。 Due to the fact that high-strength, lightweight materials have been widely used in the construction of high-rise buildings in the recent year, wind-induced vibration of flexible and flexibly supported rigid body has become a research area of great interest. However, this phenomenon involves complex fluid-structure interaction. To this date, the understanding of the phenomenon remains incomplete. In this study, the aerodynamic behaviors of high-rise buildings with tuned liquid column dampers are experimentally investigated. Experiments are carried out in a large-scale atmospheric wind tunnel. By changing the natural frequency and damping ratio of structure, the amplitude and frequency of vibration are measured for a variety of wind conditions. The vortex shedding from a vibration structure are investigated to understand the lock-in phenomenon. Finally, the effectiveness of tuned liquid column damper to reduce wind-induced vibration are tested in this study. Results of this study can improve our understanding of the fluid-structure interactions and the design of highrise buildings.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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