深圳京基金融中心气动抗风措施试验研究

深圳京基金融中心高439m，风荷载是该超高层建筑的控制荷载。采用高频底座力天平方法对该建筑模型进行了风洞试验，考察了利用其顶部设备和避难层进行开敞形成不同的风走廊(气动措施)对结构风荷载和风致响应的影响。试验结果表明：在重现期100a敏感风向作用下结构漩涡脱落频率明显低于结构基阶固有频率；气动措施可显著抑制和削弱脱落漩涡的强度，当没有受到明显干扰影响时，气动措施显示出良好的抗风效果。不同气动措施可使重现期100a结构基底弯矩减少8.2%~21.2%，使重现期10a峰值加速度减少5.3%~16.0%；受到来自于地王大厦的干扰效应的影响，在所关注重现期风速范围内的结构风振响应为上游地王大厦的尾流所控制，影响了气动措施的控制效果，但在发生涡激共振的临界风速时气动控制措施效果显著。

Experimental study on reduction of wind loads on the Shenzhen Kingkey Financial Tower by aerodynamic strategy

Shenzhen Kingkey Financial Tower (KFT) is 439m tall. Wind load plays a key role in the structural design of this building. This paper presented a detailed study of the wind induced vibration of KFT using a high frequency force balance method. The aerodynamic strategy (or the corridor ventilation) aiming to reduce the wind loads and wind induced response by placing openings on the upper three refuge floors was investigated. The results show that the vortex shedding frequency of 100 year return period (YTP) is still much smaller than the fundamental frequency of the structure at the key azimuth. The aerodynamic strategy can significantly reduce the strength of the shedding vortex and make a reduction of 8.2%~21.2% in peak base bending moment of 100 YTP and 5.3%~16.0% in peak acceleration of 10 YTP at the top of the building if no interference from the upstream buildings is considered. Unfortunately, the existence of Diwang Tower nearby can significantly interfere and dominate the aerodynamic wind loads on KFT at the wind speed of concerned return period and this finally affects the validity of the aerodynamic strategy. However, significant effects of the strategy can still been seen at the critical wind speed when the vortex shedding frequency of KFT coincides with the fundamental frequency of the structure.