Responses of a super high-rise building under earthquakes with different epicentral distances

Super high-rise buildings often symbolize significant social status and economic influence, and their safety design and assessment remain central challenges in structural engineering. Due to the complexity of their structural systems, understanding the actual dynamic properties and seismic responses of existing super high-rise structures is crucial for validating seismic analysis methods and informing future designs. This study is based on the structural health monitoring system of a nearly 500-meter-tall super high-rise building, from which acceleration response data under three earthquakes with varying epicentral distances were collected. A comparative analysis of the structural response characteristics and dynamic properties was conducted. The results indicate that, under a certain far-field earthquake, the peak structural acceleration reached 16.965 cm/s², while the fundamental period and the first-mode damping ratio in-creased by 4.795% and 91.75%, respectively. The findings underscore the importance of fully considering the effects of far-field long-period earthquakes in the design and operation of super high-rise buildings to ensure structural safety and occupant comfort. Furthermore, when the structure undergoes large-amplitude seismic responses, both the natural period and first-mode damping ratio exhibit substantial increases.