赛格大厦振动事件中的大气边界层风场实测与分析

为研究深圳赛格大厦5·18出现的振动问题，根据布置在深圳的两台激光测风雷达捕获到的大气边界层风场实测数据进行分析。结果表明：在赛格大厦振动事件中，深圳上空发生了一次持续约12h的突发风气象事件；建筑顶部300~350m高空范围内最大水平平均风速为9~12m/s；全天水平风向稳定，基本保持在西南偏南风向；在200~350m高度范围，水平方向存在一定风切变；垂直方向风速虽然整体较小，但是大气存在较明显的低空对流运动；整体上，越接近地面，低空对流越强。据此并结合已有的振动观测结果，分析了大厦发生振动的可能原因是特定风况引发建筑顶部桅杆涡激共振，持时较长的平稳风气象条件使桅杆持续不断从脱落漩涡激励中吸收能量，通过大厦钢管混凝土结构传导至建筑主体，进而引发桅杆-塔楼系统的高阶共振响应。

In site measurement and analyses on boundary layer wind during the SEG Plaza vibration event

The in site measurement data of the wind field for the atmospheric boundary layer captured by two Lidar systems installed in Shenzhen are analyzed in this study, which is used to figure out the reason behind the 5·18 Shenzhen SEG Plaza vibration event. Results show that a sudden wind meteorological event that had been lasting for 12 hours occurred during the SEG Plaza vibration event in Shenzhen. The maximum horizontal mean wind speed was about 9m/s to 12m/s at the height range of 300m to 350m, which was around at the building top. The horizontal wind direction was stable for the whole day, basically staying in the SSW direction. A wind shear phenomenon in the horizontal direction in the range of 200m to 350m above ground was detected. Although the vertical wind speed was relatively small, a relatively strong low-altitude convection phenomenon was observed in the atmosphere. The closer it is near to the ground, the stronger the convection is. Based on the field measurement data, the possible causes for the SEG Plaza vibration are preliminarily deduced: the vortex-induced vibrations of the two masts were stimulated by a specific wind condition first, and the stable wind conditions with long duration helped the masts absorbing energy continuously from the shedding vortex excitations, which was transmitted to the main body of the building through its steel tube concrete structure. Finally a wind-induced high-order coupled vibration of the mast-tower system was stimulated.