开关门窗对大跨曲面屋盖风致振动的影响

Effect of open or close windows on wind-induced vibration of long-span curved roof

以某大跨曲面屋盖为工程实例,对其进行了开关门窗两种工况下的测压风洞试验,并采用ANSYS的APDL语言开发了大跨曲面屋盖风振系数和等效静风荷载的新型计算模块,进而将计算结果以云图形式直观地展现,并可迅速地为初步设计提供结构风振敏感部位。研究表明:①开关门窗会改变风振系数和等效静力风荷载的峰值大小,但不改变风向角对它们的影响规律;②门窗开关不会对大跨曲面屋盖的主体钢架的位移峰值产生较大影响;③门窗关闭时,大跨曲面屋盖的风致振动以水平向为主,而门窗开启后,结构的内外压力差有显著变化,使结构风致振动以竖向为主。

Taking a long-span curved roof as an engineering example,open or close windows of wind tunnel test are carried on.By using APDL of ANSYS,calculation modules are developed to calculate wind-induced vibration coefficients and static wind equivalent load.The refore,results can be directly shown in the form of nephogram to quickly find out the wind-sensitive part for preliminary design.The following conclusions are obtained:1)Peaks of wind-induced vibration coefficients and static wind equivalent load would be changed by opening or closing windows,but the effect of wind angle on them would not be changed.2)Peak displacement of main steel frame would not be significantly afected by opening or closing windows.3)Horizontal wind-induced vibration would occur when windows close.Because of the change of pressure difference,vertical wind-induced vibration would occur when windows open.