Abstract
The values of natural frequencies and damping ratios are usually involved as prerequisite information for the wind-resistant and anti-earthquake design of high-rise buildings. Although many related prediction models have been proposed, a majority of them were derived based on field measurements for buildings with a height usually lower than 200 m, or occasionally between 200 m and 300 m. Over the last two decades, continuously increasing field studies have been conducted on ever-developing high-rise buildings, which provides a good opportunity to further examine the dynamic properties of such skyscrapers from a statistical perspective. In this study, a database of the natural frequencies and damping ratios for 293 high-rise buildings is established, consisting of public data sources that cover 60 super-tall buildings whose heights exceed 300 m and another 61 buildings whose heights exceed 200 m. Based on the database, the dependence of modal parameters (natural period, natural frequency and damping ratio) on various influencing factors like building height, number of floors, structural system, construction material, storey height, etc. is investigated comprehensively. Subsequently, statistical prediction models for modal parameters are proposed and compared with those documented in literature or codes/standards. It is expected that the results presented in this study would provide useful insights to better understand the dynamic properties of low-to high-rise buildings.
Published Version
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