Wuhan city is located at the junction of the Jianghan Fault Depression and the Southeastern Hubei Fold Belt,which is often affected by far-field earthquakes.At 14:00 on September 18,2022,a 6.9-magnitude earth-quake occurred in Hualian County,Taiwan Province of China.The structural dynamic response of a super high-rise building to the Hualian earthquake was completely recorded at 4 monitoring points in this building in Wuhan,more than 1000 km away from the epicenter.In order to study the impact of the earthquake on the building struc-ture,the anisotropic PGA amplification effect,the Fourier spectrum and the response spectrum are analyzed.The mutual power spectrum method and the stochastic subspace identification method based on covariance are used re-spectively to identify the first-order modes of the structure in the frequency domain and the time domain.The re-sults show that the peak acceleration of the structure has a significant amplification effect with the increase of the height of the floor,and the maximum amplification factor is 7.322.The peak value of the Fourier spectrum is con-centrated at 0.275 Hz and 1.171 Hz.The response spectrum of acceleration response is much smaller than the de-sign spectrum of the Ⅵ-degree fortification earthquake in this area.The frequencies of the first-order modes identi-fied by the two methods are generally the same,and are close to the values of numerical simulation.It is believed that the Hualian,Taiwan MS6.9 earthquake did not cause damage to the structure of the case building.
关键词
台湾花莲地震/模态频率识别/互功率谱法/随机子空间法/结构响应观测台阵
Key words
the Hualian,Taiwan earthquake/modal frequency identification/the mutual power spectrum method/the stochastic sub-space method/the structural response observation array
维普
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