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针对439 m的深圳京基金融中心(KFT)工程,采用气动弹性模型技术研究其横风向气动阻尼特性。根据工程地址的100 a重现期风速、缩尺比例以及前期刚体模型同步测压所得到结构风敏感风向(东西向)的广义力功率谱密度特征确定气弹模型试验的风速范围,通过风洞试验获取不同风速下气动弹性模型敏感风向的顶部加速度响应数据,应用随机减量技术计算分析横风向气动阻尼随折算风速的变化规律,试验考虑结构模态阻尼对气动阻尼的影响。结果表明:在折算风速为4~14的范围内,结构气动阻尼值均大于0且随风速的增大而增大,上游地王大厦(DWT)的干扰效应对气动阻尼未产生不利影响,KFT的基本频率和DWT脱落在尾流中的漩涡频率一致的100 a重现期风速时的气动阻尼比为1.25%,表明前期采用刚性模型试验对KFT进行抗风设计时,不考虑气动阻尼影响计算得到的结构风致荷载和风致响应偏于保守和安全。
Aiming at the 439 m Shenzhen KF Financial Center (KFT) project, the aeroelastic model technology is used to study the cross-wind aerodynamic damping characteristics. The wind speed range of the aeroelastic model test is determined according to the generalized force power spectral density characteristics of the wind-induced wind direction (east-west direction) obtained from the 100-year recurring wind speed, scale ratio and synchronous pressure measurement of the previous rigid body model. The top acceleration response data of the sensitive wind direction of the aeroelastic model under different wind speeds were obtained. The variation law of the aerodynamic damping with the converted wind speed was calculated and analyzed by using the random reduction technique. The influence of structural modal damping on the aerodynamic damping was considered. The results show that the aerodynamic damping of the structure is greater than 0 and increases with the increase of the wind speed in the range of the converted wind speed of 4 ~ 14. The disturbance effect of the upstream Wangdi Building (DWT) has no adverse effect on the aerodynamic damping, The aerodynamic damping ratio of the basic frequency of KFT and DWT shedding at the whirlpool frequency of wake in the wake of 100 a is 1.25%, which indicates that the aerodynamic damping effect The calculated wind load and wind response are conservative and safe.