曲壳裙房对球形高层建筑风荷载影响的数值研究

NUMERICAL STUDY ON THE EFFECTS OF CURVED ANNEX ON THE WIND LOADS ON A SPHERICAL TALL BUILDING

对一球形高层建筑在有和没有曲壳裙房情况下的表面风压分布进行了数值模拟和分析。结果表明,曲壳裙房对主体高层建筑的风荷载有着较显著的影响。裙房缩小了球形建筑迎风面和背风面的正风压区域,最大正风压略有减小;裙房较大程度地提高了球形建筑侧风面和顶面的负风压数值,整体结构的风荷载趋于增大,风压分布趋于不均匀。由于裙房的影响,在球面背风区下侧还观察到了明显的对称涡列。在对不同风向角下的风压分布规律进行分析的基础上,还给出了建筑物在最不利风向角下的最不利剖面上的风压系数分布曲线。

Numerical simulation was conducted to investigate the wind pressure distributions on the surface of a spherical tall building with and without curved annexes. Significant effects induced by the annex on the wind loads on the main tall building were observed. Due to the existence of the annex the area of positive pressures on the windward and leeward surface of the spherical building was reduced, and the maximum positive pressure also had a slight decrease. The absolute values of the maximum negative pressure on the sideward and top surface of the building increased to a relatively large degree. The total wind loads on the building tended to become larger and the pressure distribution tended to be more non-uniform. Symmetrical vortex street in the leeward area of the spherical building was observed due to the interference effects of the annex. Based on the analysis of wind pressure distributions under different wind directions, the wind-pressure coefficient variation curves on the most unfavorable sections under the most unfavorable wind directions are presented.