层叠式高层建筑多维风振效应试验研究

Experimental study on multi-dimensional wind-induced vibration of laminated high-rise building

层叠式高层建筑由于体型不规则,且承受三维风荷载作用,其在强风作用下的风致振动效应区别于一般超高层建筑。结合某大型盒式单元构成的超高层建筑,在进行了刚性同步测压风洞试验的基础上,分别对大楼结构的水平、垂直风致振动效应进行了计算和分析,并详细分析了关键风向下结构的等效静风荷载。结果表明:对层叠式不规则结构应综合考虑平动和扭转效应;在结构水平向风效应较大的风向下,平均分量贡献占主导,结构横风振动效应不突出;结构层叠处的大悬挑结构竖向振动效果不明显,可按刚体的阵风效应进行风荷载取值。

The wind-induced vibration effects of laminated super high-rise buildings are more complex than those of the common super high-rise buildings under actions of strong winds,because of their irregular shapes and three-dimensional wind load action.The horizontal and vertical wind-induced vibration effects of a super high-rise building with large boxtyped units were calculated and analyzed respectively on the basis of the wind tunnel test of rigid syn-step pressure,and the equivalent static wind load of the structure under the key wind direction was analyzed in detail.The results show that the translational and torsional effects should be considered comprehensively for the laminated irregular structures.Under the wind direction with large horizontal wind-induced effect,the contribution of mean component is dominant,and the cross wind vibration effect is not prominent.The vertical dynamic effect of the large cantilever structure near the laminated location is not obvious,so the wind load can be calculated according to the gust effect of the rigid body.