- 學位論文
高層建築於干擾效應下不同約化風速對於氣彈實驗結果之影響
Interference Effects of Highrise Building Based on Aeroelastic Experiments under Various Reduced Velocities
摘要
風力對於高層建築物的反應為高層建築設計中重要的一環，本研究以建物之間位移擾動值所造成的干擾效應影響比較為中心，比較不同約化風速及不同地況下位移擾動值的差異性。本實驗主要分為三個部分，第一部分為探討不同風速與流場之干擾效應下氣彈力實驗，比較位移擾動值之間的差異；第二部分為 C地況不同約化風速下的干擾因子與羅元隆(2015)的研究進行比對與探討；第三部分則探討 C地況不同約化風速下的位移擾動值。 實驗結果發現，A、B地況的位移擾動反應較為接近，則C地況干擾現象更為明顯，干擾效應主要影響的範圍是 1.5B ~ 3B 的位置，遠離這個範圍量測到的干擾現象較不顯著，整體的位移擾動值有隨著約化風速的增大，最大的干擾因子出現在( x/B , y/B ) =( -1.5 , 1.5)位置，從軌跡圖可以發現斜橢圓的形狀，推測出橫風向以渦散現象主導的振動已消失，有部分的外力轉移到順風向，此點位在低約化風速下有極大的擾動反應。
並列摘要
This research focuses on the fluctuating response of high-rise building interfered by another identical neighboring building under different reduced velocities and exposed to different terrains. The discussions based on aero-elastic tests and categorized into three topics: (1) investigation of fluctuating responses under two reduced velocities and three terrains, which are open (α = 0.15), suburban (α = 0.25), and urban (α = 0.32); (2) interference factors due to detailed reduced velocities at open terrain and; (3) the fluctuating response values. Results showed that the tendencies of suburban and urban terrains are similar and not apparent as open terrain for interference effects. The main dominant interference range is those positions within 1.5B to 3.0B, where B stands for the principal building’s width. In general, the fluctuating response increases with the reduced velocity and for those positions near 1.5B and 2.0B there are various interference effects found. One interesting position is that the interfering building is at x/B = -1.5 and y/B = 1.5, where the trajectory shape is elliptical only when the reduced velocity is around 6.0 m/sec. Once the position is moved or the reduced velocity is changed, this phenomenon disappears. Several other comparisons with Lo et al (2016) and Chen (2016) were carried out for enhancing the interference effect mechanisms.