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风荷载是高层建筑设计的控制荷载之一,来流湍流对结构风荷载分布和风致响应有很大的影响,研究来流湍流对高层建筑风荷载的影响有很重要的实际意义。本文主要研究来流湍流强度对高层建筑风压幅值特性的影响。为形成不同的湍流强度,本文采用风洞试验的方法,共模拟了五种风场,对2种不同断面相同高度共2个模型进行了研究。结果表明,当湍流强度比我国D类风场的湍流强度明显增大时,模型的四个侧面的平均风压系数在数值上是增大的,但是在背风面和侧面的平均风压系数绝对值是减小的;在D+风场中,背风面和侧风面出现了小正压。特别是背风面平均风压系数增加量比迎风面前后对应位置增加量更大,从而使整个结构所受的平均风阻力减小。高湍流强度对高层建筑表面风压有明显影响(如小正压),可为高层建筑抗风设计提供参考。
Wind load is one of the control loads in high-rise building design. The turbulent flow has a great influence on the wind load distribution and wind-induced response. It is of great practical significance to study the effect of turbulent flow on the wind load of tall buildings. This paper mainly studies the influence of turbulence intensity on the amplitude characteristics of wind pressure in tall buildings. In order to form different turbulence intensities, wind tunnel tests were used to simulate five kinds of wind fields in total. Two models with the same height at two different sections were studied. The results show that when the turbulence intensity is significantly higher than the turbulent intensity of the D-type wind field in China, the mean wind pressure coefficient of the four sides of the model increases numerically, but the average wind pressure coefficient at the leeward side and the side is absolute Value is reduced; in the D + wind field, there is a slight positive pressure on the leeward and sidewinds. In particular, the increase of the average wind pressure coefficient on the leeward side is larger than that of the windward side, so that the average wind resistance of the whole structure is reduced. The high turbulence intensity has a significant effect on the wind pressure on the surface of high-rise building (such as small positive pressure), which can provide reference for wind-resistant design of tall buildings.