高湍流度下超高层建筑的风致振动响应特性

Wind-induced vibration response of super high-rise building in high-turbulence flow

在较高湍流度流场用高频测力天平方法对金茂大厦模型进行了风洞试验,分析了周围建筑以及待建的环球金融中心对金茂大厦的基础平均风荷载、气动风荷载和风振响应的影响和干扰效应。结果表明:湍流度对静风荷载影响甚少,但对动力风荷载以及风振响应影响很大;总的来说,D类流场下的结构抖振效应要明显高于B类地貌情况。环球金融中心对金茂大厦有很大的静力遮挡影响,同时也增大了其风振响应和总的风振荷载,其中对总风振荷载的干扰效应随着湍流度的增加而降低,但在D类地貌下且梯度风高度处的湍流度为15.8%时的干扰因子依然较为明显,干扰效应并没有消失。

The wind-tunnel experiment of the Jin Mao building model in the higher turbulence flow was carried out by using high-frequency-force base balance. The effects of the surrounding buildings including the World Financial Center Tower on the mean load, dynamic load and wind-induced response are analyzed. The results show that turbulence has little effect on mean load, but has a strong effect on dynamic load and wind-induced response. Generally, the buffeting effects of the building in terrain category D are much higher than those in terrain category B. The World Financial Center Tower has significant interference effects on the Jin Mao building, and the effects decrease with the increase of turbulence intensity of the approach flow. However, the interference effects are still significant when the turbulence intensity is 15.8% at the gradient wind height in terrain category D.