大高宽比高层建筑风效应试验研究

Experimental study on wind effects of tall building with large height-width ratio

以一栋大高宽比高层建筑为背景,通过多点同步测压风洞试验,结合时域和频域分析方法对其进行风效应分析。首先计算了惯性力法得到的各层等效静风荷载和风荷载时程分别作用下结构的位移响应,并分析了典型风向的结构响应特性;同时以330°风向角下的风洞试验时程数据为基础,进行了气动力功率谱密度分析;最后分析了阻尼比参数的选取对结构风致响应的影响。结果显示:对于该高层建筑的风致响应计算,仅考虑基阶振型的贡献可以近似满足工程精度要求;加速度计算对应的横风向广义力与位移计算的相比较大,但数值表现均不明显。最后给出了结构阻尼比与控制性风向风致响应的定量关系。

Taking a tall building with large height-width ratio as the background, wind effect analysis was carried out through the wind tunnel test of multi-point synchronous pressure measurement, combined with time domain and frequency domain analyses methods. First structural displacement responses were calculated under the actions of equivalent static wind load of each layer and wind load that calculating respectively by using the inertia force method. The structural response characteristics in the typical wind direction were analyzed. Based on wind tunnel test time-history data at 330° wind angle, aerodynamic power spectral density analysis was carried out. Finally the influence of damping ratio parameter on the wind- induced response was studied. The results show that for the wind-induced response calculation of the tall building, it＇s approximated to meet the precision requirements of the engineering considering only the contribution of the fundamental mode. Across-wind generalized force corresponding to the acceleration calculation is large compared to the displacement calculation, but the numerical performance is not obvious. Finally, the quantitative relation between the damping ratio and wind-induced response with controlled wind direction was given.