- 摘 要
-
(1 湖南科技大學(xué)土木工程學(xué)院， 湘潭 411201； 2 湖南科技大學(xué)結(jié)構(gòu)抗風(fēng)與振動控制湖南省重點實驗室， 湘潭 411201)
［摘要］對一典型有站臺柱高鐵站臺雨棚進(jìn)行1∶150縮尺剛性模型測壓風(fēng)洞試驗，研究雨棚屋面平均風(fēng)壓系數(shù)分布規(guī)律、上下表面風(fēng)壓相關(guān)性、表面脈動風(fēng)壓的非高斯統(tǒng)計特性，局部塊體型系數(shù)的分布規(guī)律并與規(guī)范比較。結(jié)果表明：站臺雨棚的迎風(fēng)前緣測點風(fēng)壓相關(guān)系數(shù)小于0.5，有較高的吸力特性；氣流尾流區(qū)域和站房遮擋區(qū)域測點風(fēng)壓為強(qiáng)相關(guān)，但風(fēng)壓較小；雨棚風(fēng)壓非高斯特征明顯，斜風(fēng)向45°時雨棚測點風(fēng)壓非高斯區(qū)占比高達(dá)82.9%，Hermite級數(shù)對非高斯風(fēng)壓測點的概率密度分布擬合效果較好；后方受干擾雨棚的迎風(fēng)側(cè)塊平均風(fēng)壓干擾因子在0.5附近變化，背風(fēng)側(cè)塊干擾因子較大但其風(fēng)荷載較?。挥昱镲L(fēng)荷載負(fù)體型系數(shù)風(fēng)洞試驗值（-1.16）與規(guī)范值接近，正體型系數(shù)風(fēng)洞試驗值為0.13。
［關(guān)鍵詞］風(fēng)洞試驗； 站臺雨棚； 體型系數(shù)； 干擾因子； 非高斯特性； 風(fēng)壓系數(shù)極值
中圖分類號：文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)16-0119-06
Research on wind loads and interference factor on platform canopy of high-speed railway
TAN Jieyuan1, LI Shouke1,2, XIAO Feipeng1
(1 School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;2 Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control, Hunan University of Science and Technology, Xiangtan 411201, China)
Abstract:Wind tunnel pressure tests of a platform canopy on a high-speed rail station were carried out with model scale of 1∶150. The mean wind pressure coefficients, the wind pressure correlation between the upper and lower surfaces, the non-Gaussian statistical characteristics of surface wind pressure, distribution rules of local block shape coefficient of the platform canopy were specially studied, and the values were compared with standards. The results show that the wind pressure correlation coefficient is smaller than 0.5 at the windward leading edge of the canopy, and which is suffered high suction. The wind pressures are strongly related and small at the wake inflow region and at the sheltered region because of the station building. The wind pressures of the canopy are strongly non-Gaussian. The proportion of non-Gaussian wind pressure is 82.9% under wind angle of 45°. The probability density distribution of non-Gaussian wind pressure can be fitted by Hermite series. The disturbance factors of mean wind pressure varied around 0.5 at the windward side because of disturbance of the disturbed canopy, while the disturbance factor is large for the leeward side block but the values of wind load are small; the negative shape coefficient is -1.16 from wind tunnel test, that is close to the value of standard, and the positive shape coefficient is 0.13 from wind tunnel test.
Keywords:wind tunnel test; platform canopy; shape coefficient; disturbance factor; non-Gaussian; peak wind pressure coefficie
*國家自然科學(xué)基金(51508184)，湖南省教育廳創(chuàng)新平臺開放基金(17K034)，湖南省自然科學(xué)基金(2016JJ3063)。
作者簡介：譚杰元，學(xué)士，Email:752582941@qq.com;通訊作者：李壽科，博士，副教授，Email：32090170@163.com。
