This paper examines the impact of long-period components of far-field ground motion,which can resonate with the natural period of high-rises and super high-rises,potentially leading to significant earthquake damage.The study focuses on the M6.5,M5.7,M6.9,and M5.4 earth-quakes that occurred in Hualien County,Taiwan,China,from 21:41 on September 17,2022,to 17:39 the following day.Using the Hilbert-Huang transform method,the paper preliminarily an-alyzes the structural dynamic response data of a super high-rise in Wuhan,located more than 1 000 kilometers away from the epicenter.By analyzing the long-period characteristics of the in-trinsic mode function components across different time scales,the ground motion of each struc-tural layer was reconstructed.The power spectrum method was used to determine the frequency response function of each structural layer relative to the ground layer.The first modal frequency and vibration mode were identified using the complex-mode Exp-function method.The analysis results indicated that the modal frequencies and vibration modes of the super high-rise structure remained intact under the long-period ground motions from the four earthquakes.This finding provides a crucial reference for post-earthquake safety evaluations of super high-rises in Wuhan when exposed to long-period ground motions.
万方数据
维普
