Abstract This study identifies the modal parameters of four super high-rise buildings in Shenzhen and analyzes the variation of their structural dynamic properties with amplitude and time based on the long-term field data of Super Typhoon Mangkhut. Results show the maximum acceleration of the four buildings is 13.29–41.96 milli-g and occurs at the maximum wind speed period. In the early stage, as the wind speed increases with time, structural modal frequencies decrease and reach the minimum during the maximum wind speed period. Subsequently, wind speed gradually decreases, modal frequencies increase slowly, and the highest ratio of frequency change is 11.9%. The change of damping ratio is somewhat stochastic but overall first increases and then decreases with time. The mode shapes of most buildings remain basically unchanged during typhoon. However, the mode shapes of the building with the maximum response differ greatly at the maximum and the low wind speeds. Besides, the two-order modal frequencies drop sharply near the maximum wind speed and approach one another to an indistinguishable degree. These new results and rules of modal parameters have important reference values for the further research on the influence of wind–structure interaction on structural wind effect and subsequent wind-induced vibration control.

中文翻译：

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超强台风下超高层建筑模态参数时变特性现场实测研究

摘要 本研究基于超强台风“山竹”的长期现场数据，识别了深圳四栋超高层建筑的模态参数，分析了其结构动力特性随振幅和时间的变化规律。结果表明，四个建筑物的最大加速度为 13.29-41.96 毫克，并且发生在最大风速时期。在早期，随着风速随时间增加，结构模态频率降低，在最大风速期间达到最小值。随后，风速逐渐降低，模态频率缓慢增加，频率变化率最高为11.9%。阻尼比的变化有些随机，但总体上随时间先增加后减小。大多数建筑物的振型在台风期间基本保持不变。然而，具有最大响应的建筑物的振型在最大风速和低风速下差异很大。此外，二阶模态频率在最大风速附近急剧下降并相互接近到无法区分的程度。这些新的模态参数结果和规律对于进一步研究风-结构相互作用对结构风效应的影响及后续风振控制具有重要的参考价值。