- 摘 要
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（1 哈爾濱工業(yè)大學(xué)建筑設(shè)計研究院， 哈爾濱 150090； 2 哈爾濱工業(yè)大學(xué)土木工程學(xué)院， 哈爾濱 150090）
［摘要］為保障某高校主樓屋頂權(quán)杖結(jié)構(gòu)的抗風(fēng)安全性，對其進行了剛性模型風(fēng)洞測力試驗研究。分析了升、阻力系數(shù)及升、阻力矩系數(shù)隨風(fēng)速及風(fēng)向角的變化規(guī)律。結(jié)果表明，升力系數(shù)均值在0附近，升力系數(shù)均方根均在0-1附近，而0°風(fēng)向角下，阻力系數(shù)均值的變化范圍為1-25～1-41，阻力矩系數(shù)均值在0-8附近；90°風(fēng)向角下，阻力系數(shù)均值的變化范圍為0-98～1-15，阻力矩系數(shù)均值在0-6附近。通過貼砂紙來改變表面粗糙度，探討了表面粗糙度對橫風(fēng)向振動的影響，發(fā)現(xiàn)漩渦脫落頻率和斯托羅哈數(shù)隨著表面粗糙度的增加而減小，說明表面粗糙度會影響漩渦脫落規(guī)律，改變漩渦脫落頻率，但是升力系數(shù)均方根隨風(fēng)速變化較小，未出現(xiàn)突然增大的現(xiàn)象，即未出現(xiàn)渦激共振。此外還研究了纏繞金屬線對結(jié)構(gòu)氣動特性的影響，發(fā)現(xiàn)纏繞金屬線對漩渦脫落頻率、斯托羅哈數(shù)和升力系數(shù)均方根的影響不大，說明纏繞金屬線沒有改善結(jié)構(gòu)氣動性能。
［關(guān)鍵詞］權(quán)杖結(jié)構(gòu)； 測力風(fēng)洞試驗； 氣動特性； 渦激共振； 表面粗糙度； 斯托羅哈數(shù)
中圖分類號：TU312+.1文獻標(biāo)識碼：A文章編號：1002-848X(2018)12-0079-06
Wind-resistant performance of scepter structural roof of a university main building
Yuan Fang1, Sun Xiaoying2, Li Guoqiang1, Wu Yue2
(1 The Architectural Design and Research Institute of HIT, Harbin 150090, China; 2 School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China)
Abstract:In order to ensure the wind-resistant safety of a scepter structure of a main building roof in a university, a force balance wind tunnel test study on the rigid model was carried out. The drag force coefficient, lift force coefficient and drag moment coefficient and lift moment coefficient were analyzed versus wind velocity and wind direction angle. Results show that the mean lift force coefficient is around 0. The root mean square of the lift force coefficient is around 0-1. The mean drag force coefficient is ranged from 1-25 to 1-41 at the wind direction angle of 0° and from 0-98 to 1-15 at the wind direction angle of 90°. The mean drag moment coefficient is around 0-8 at 0° and 0-6 at 90°. The surface roughness was changed by pasting sandpaper on the surface of the model, and the effect of surface roughness on across-wind vibration was discussed. It is found that the vortex shedding frequency and Strouhal number decrease with the increase of surface roughness, indicating that the surface roughness affects the vortex shedding law and change the vortex shedding frequency. However, the root mean square of the lift force coefficient under different roughness changed little with the wind speed that means the lift force coefficient has no sudden increase. It can be considered that there is no vortex-induced resonance. In addition, the effect of twining metal on the aerodynamic characteristics was also investigated. It is found that Strouhal number and the root mean square of lift force coefficient do not change much. That means the twining metal does not improve the aerodynamic performance of the structure.
Keywords:scepter structure; force balance wind tunnel test; aerodynamic performance; vortex-induced resonance; surface roughness; Strouhal number
作者簡介：遠(yuǎn)芳，碩士，高級工程師，一級注冊結(jié)構(gòu)工程師，Email:yuan_fang09@163.com。
