邻近建筑对超高层建筑风振响应的干扰效应

Interference Effects on Windinduced Responses of Supertall Building Caused by Adjacent Buildings

摘要:

在同济大学TJ2边界层风洞中进行了上海环球金融中心气动弹性模型的风洞试验，分析了距离较远且高度约为环球金融中心一半的周边建筑以及距离较近且高度与环球金融中心相当的金茂大厦对环球金融中心顶部平动和转动平均位移、均方根位移和绝对最大加速度的干扰效应.结果表明：当高层密集建筑群（不考虑金茂大厦）集中在上游或上游偏一侧时，会对平均值和均方根有一定的影响，特别是扭转响应，当高层密集建筑群集中在下游时，影响很小；当金茂大厦位于环球金融中心的上游或上游稍偏一侧时，会减小环球金融中心的平动平均位移响应，表现为挡风效应，其尾流会增大环球金融中心的平动均方根位移响应，而当遮挡效应使得平均或脉动压力在形心轴两侧分布不均时会增大转动平均或均方根位移响应.与以往研究不同的是，当金茂大厦位于环球金融中心下游或下游偏一侧时，会改变环球金融中心的漩涡脱落频率，当漩涡脱落频率和结构第一阶固有频率接近时，会在该频率振动方向产生显著的涡激共振现象.当金茂大厦位于环球金融中心一侧时会产生狭道效应（穿堂风），可能会对水平和扭转的平均和均方根位移响应产生影响，视狭道方位和压力分布状况而定.

Abstract:

The aeroelastic model experiment of Shanghai World Financial Center was carried out in TJ2 boundary layer wind tunnel. Then,a study was conducted on the interference effects of distant buildings with half the height of World Financial Center and the nearby Jin Mao Building with nearly the same height of World Financial Center on average and root mean square value of horizontal and rotational displacement, absolute maximum acceleration on the top of World Financial Center.The results show that, when the intensive highrise buildings (excluding Jin Mao Building) concentrate on the upstream or one side of World Financial Center, they have some influence on World Financial Center’s average response and root mean square value(RMS) response, especially the rotational response. When the intensive buildings concentrate on the downstream of World Financial Center, they have little influence on World Financial Center’s response. When Jin Mao Building locates in the upstream of World Financial Center, the average response of horizontal displacement of World Financial Center reduces due to wind block effects. However, the tail flow of Jin Mao Building causes the RMS horizontal displacement response of World Financial Center to increase. When the shielding effect causes uneven distribution of the average or fluctuating pressure at cardiac axis sides, it increases average or root mean square rotational displacement response. Different from previous studies, when Jin Mao Building locates in the downstream of World Financial Center, the frequency of vortex shedding of World Financial Center will change. Moreover, when the vortex shedding frequency is close to structural first natural frequency, it causes vortexinduced resonance phenomenon in direction of vibration of first natural frequency. When Jin Mao Building locates beside World Financial Center, it causes Narrow Road effect, which has some influences on average and RMS displacement response according to Narrow Road position and the pressure distribution.