不同体型建筑物尾流作用下的高层建筑的风荷载特性

采用高频底座力天平方法,研究了不同断面形状的施扰建筑对一典型断面受扰建筑的静力和动力干扰影响,分析了正方形断面施扰建筑和非正方形断面施扰建筑的干扰效应的差异和产生差异的干扰机理。结果表明:施扰建筑断面形状的改变对静力干扰的影响不显著,但对于动力响应方面则有非常明显的影响。由于位于上游的切角断面施扰建筑脱落的在其尾流中的漩涡频率要明显大于正方形断面施扰建筑的涡脱频率,使得其产生的最大包络动力干扰因子值(EIF)要显著高于断面为正方形施扰建筑的EIF值,最大可达4.41(顺风向)和3.69(横风向),相比断面为正方形的高出142%和82.7%。

Wind Loads to Tall Buidings Due to Wakes from Differentially Featured Constructions

The wind induced response of a tall building with interference effects from nearby tall buildings with various sections was investigated via high frequency force balance technique.The different effects between square cross-section and corner-cut buildings were compared and discussed to understand the interference phenomenon.The results showed that the shape of the interfering buildings had no significant effects on the static interference.However,due to the higher vortex shedding frequency induced by the corner-cut interfering building,its dynamic interference effect was found to be more significant than that of a square section interfering building.The tested maximum dynamic envelope interference factors(EIF) of the corner-cut buildings were found up to 4.41 and 3.69 in the along-wind and across-wind direction,which were respectively 142% and 83% greater than those of the square cross-section interfering building.