矩形高层建筑顺风向脉动风荷载空间相关性

发布时间：2018-03-16 05:35

本文选题：矩形高层建筑　切入点：顺风向脉动风荷载　出处：《哈尔滨工业大学学报》2017年06期 　论文类型：期刊论文

【摘要】：为研究风场类别、结构特征尺寸及竖向间距等因素对矩形高层建筑顺风向脉动风荷载空间相关性的影响,采用矩形刚性模型表面压力同步测量试验,对顺风向脉动风荷载及脉动风速相干函数空间分布特性进行研究,对矩形模型表面脉动风荷载与脉动风速、迎风面与背风面脉动风压的相关性进行对比分析.根据试验结果,对传统脉动风速相干函数模型进行改进,提出了可计及风场类别、结构迎风面宽度及竖向间距等流场和结构参数的矩形建筑顺风向脉动风荷载相干函数表达式.结果表明:顺风向脉动风荷载的相关性要明显强于脉动风,当矩形断面长边迎风时,迎风面脉动风压相关性低于断面整体风荷载的相关性,背风面脉动风压的弱相关性在间距较小时并不能完全忽略,采用传统脉动风速相干函数模型可能导致脉动风荷载取值偏不安全.
[Abstract]:In order to study the influence of wind field type, structural characteristic size and vertical spacing on spatial correlation of downwind pulsating wind loads in rectangular high-rise buildings, the surface pressure of rectangular rigid model was measured simultaneously. The spatial distribution characteristics of downwind pulsating wind load and pulsating wind velocity coherence function are studied. The correlation between pulsating wind load and pulsating wind speed on the surface of rectangular model and fluctuating wind pressure on upwind and leeward surface is compared and analyzed. The traditional coherent function model of fluctuating wind speed is improved, and the category of wind field is proposed. The coherent function expression of the downwind pulsating wind load of rectangular buildings with the same flow field and structural parameters as the width and vertical spacing of the structure upwind is obtained. The results show that the correlation of the downwind pulsating wind load is stronger than that of the pulsating wind. When the long side of rectangular section is upwind, the correlation of fluctuating wind pressure on upwind surface is lower than that of overall wind load on the section, and the weak correlation of fluctuating wind pressure on leeward surface can not be completely ignored when the spacing is small. The traditional coherent function model of fluctuating wind speed may lead to unsafe values of fluctuating wind loads.
【作者单位】：西南交通大学风工程试验研究中心;风工程四川省重点实验室(西南交通大学);
【基金】：国家自然科学基金(51278433,51478402)
【分类号】：TU973.213

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