高铁站台雨棚表面风荷载及干扰效应研究  

Research on wind loads and interference factor on platform canopy of high-speed railway

作　　者：谭杰元 李寿科[1,2] 肖飞鹏 TAN Jieyuan;LI Shouke;XIAO Feipeng(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湘潭411201 [2]湖南科技大学结构抗风与振动控制湖南省重点实验室,湘潭411201

出　　处：《建筑结构》2020年第16期119-124,33,共7页Building Structure

基　　金：国家自然科学基金(51508184);湖南省教育厅创新平台开放基金(17K034);湖南省自然科学基金(2016JJ3063)。

摘　　要：对一典型有站台柱高铁站台雨棚进行1∶150缩尺刚性模型测压风洞试验,研究雨棚屋面平均风压系数分布规律、上下表面风压相关性、表面脉动风压的非高斯统计特性,局部块体型系数的分布规律并与规范比较。结果表明:站台雨棚的迎风前缘测点风压相关系数小于0.5,有较高的吸力特性;气流尾流区域和站房遮挡区域测点风压为强相关,但风压较小;雨棚风压非高斯特征明显,斜风向45°时雨棚测点风压非高斯区占比高达82.9%,Hermite级数对非高斯风压测点的概率密度分布拟合效果较好;后方受干扰雨棚的迎风侧块平均风压干扰因子在0.5附近变化,背风侧块干扰因子较大但其风荷载较小;雨棚风荷载负体型系数风洞试验值(-1.16)与规范值接近,正体型系数风洞试验值为0.13。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.

关 键 词：风洞试验 站台雨棚 体型系数 干扰因子 非高斯特性 风压系数极值 

分 类 号：TU312.1[建筑科学—结构工程]