截面旋转及朝向对建筑周边行人风环境的影响

Effect of twist of section and orientation on pedestrian wind environment around buildings

基于风洞试验和风环境评估理论对方形、矩形、椭圆形等基本形体及其相应截面旋转形体的超高层建筑周边行人风环境进行研究,分析了不同朝向及不同旋转角度下建筑周边行人风环境的舒适性和安全性。结果表明:朝向变化对方形截面建筑行人风环境影响较小,对矩形及椭圆形等双轴不等长截面建筑影响较大,将短边垂直于主导风向可以显著改善建筑周边行人风环境;截面旋转改变了朝向变化对建筑行人风环境的影响规律,旋转建筑与基本截面建筑的行人风环境分布随朝向的增加呈现相反的变化趋势;截面旋转不利于方形截面建筑周边行人风环境分布;对于矩形和椭圆形截面建筑,截面旋转可以减小朝向的变化对行人风环境的影响。研究成果探明了截面旋转角度及朝向变化对基本形体超高层建筑周边行人风环境的影响规律。

Based on wind tunnel tests and the assessment theory of pedestrian wind environment,the pedestrian wind environment around super high-rise buildings with basic sections such as square,rectangular,elliptic and their corresponding helical buildings were studied,and the comfort and safety of pedestrian wind environment around the building with different orientations and rotation angles were investigated.The results show that the change of orientation has little influence on the pedestrian wind environment of square buildings,while has great influence on the biaxial symmetrical cross section building such as rectangles and ellipses.If the short side of buildings is perpendicular to the dominant wind direction,the pedestrian wind environment around the building can be significantly improved.The twist of section changes the effect of orientation variation on pedestrian wind environment,and the pedestrian wind environment assessment results of helical buildings and basic buildings show an opposite trend with the increase of orientation.The section rotation is not conducive to the distribution of pedestrian wind environment around the square building.For rectangular and elliptic buildings,the twist of section can reduce the impact of orientation changes on pedestrian wind environment.The research results prove the influence law of the rotation angle of cross section and orientation change on the pedestrian wind environment around the super high-rise building with basic sections.