- 摘 要
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(1 湖南大學土木工程學院,長沙 410082; 2 香港城市大學建筑系,香港 100013)
[摘要]通過對吉林火車站的剛性模型風洞試驗研究,得到了在有無周邊建筑群干擾下屋蓋表面的風壓系數(shù)等值線圖、脈動風壓系數(shù)與屋蓋的升力系數(shù)隨風向角的變化曲線,對其風壓分布特性做了詳細的對比分析研究。研究結(jié)果表明:大跨屋蓋結(jié)構(gòu)表面主要呈現(xiàn)負風壓(風吸力),屋蓋合力升力系數(shù)均為負值。主站樓在迎風區(qū)屋檐、懸挑區(qū)域及屋面凸起的天窗位置氣流分離較大,風壓變化明顯,出現(xiàn)較大的負風壓系數(shù);由于站臺雨篷四周開敞,氣流流經(jīng)站臺雨篷時較為順暢,氣流分離較小,因而站臺雨篷風壓系數(shù)較小。
[關鍵詞]大跨屋蓋;風洞試驗;平均風壓系數(shù);脈動風壓系數(shù);升力系數(shù)
中圖分類號:TU312+.1文獻標識碼:A文章編號:1002-848X(2012)02-0148-06
Experimental study of wind load characteristics on a long-span complex roof structure
Zhang Mingliang1,Li Qiusheng1,2(1 College of Civil Engineering, Hunan University, Changsha 410082, China; 2 Department of Building and Construction, City University of Hong Kong, Hong Kong 100013, China)
Abstract: Based on the wind-tunnel test of rigid model of Jilin Railway Station, the contours of the wind pressure coefficients, the variations of wind pressure coefficients and the lift coefficients of the roof were presented and discussed with and without the surrounding buildings. The characteristics of the wind pressure distributions were analyzed. It was found that negative pressures (suctions) occurred on the long-span roof in general, the values of the lift coefficients of the roof were negative, and high negative pressure coefficients occurred on the eaves, cantilevered roof and the bulge part of the roof on the main station building. Relatively smaller suctions occurred on the platform awnings of the station because of open surrounding configurations there.
Keywords: long-span roof; wind tunnel test; mean pressure coefficient; fluctuating pressure coefficient; lift coefficient
*國家自然科學基金重大研究計劃重點項目(90815030)。
作者簡介:張明亮,博士研究生,Email:zml@hnu.edu.cn。
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