考虑风向的两栋典型截面超高层建筑主体风荷载研究及规范值比较

Research on wind load on two super high-rise buildings with typical section taking wind direction into consideration and comparison with code

基于刚性模型的高频天平测力风洞试验,对外附网架的超高层建筑的基底弯矩和扭矩特性进行了分析,详细讨论了复杂的周边建筑环境对近似方形截面建筑的整体气动力特性的影响。研究结果表明,复杂周边建筑环境对超高层建筑的气动力均值和脉动值影响主要表现为遮挡效应,尤其在两幢建筑物串联、并列时。在考虑风向的前提下,将层间等效静力风荷载及总体基底剪力和弯扭矩的规范值和试验结果进行了比较,可知规范值在一定程度上可以包络试验值,但是经济性不佳。

Based on high frequency force balance（ HFFB） wind tunnel test of the rigid model of an actual grids-attached super high-rise building,the base moment and torque properties were analyzed and the effect of complex surrounding building environment on integrated aerodynamic force characteristics of the structure was discussed in detail. The study results indicate that complex surrounding building environment mainly has sheltering effect on mean value and fluctuation value of aerodynamic force for the super high-rise building,especially when two buildings are in series or parallel. On condition that wind direction was considered,code values and test results were compared of equivalent static wind load,integrated base shear force and torque. It＇s concluded that code values can completely envelope test values to some extent,but it costs more.