Spectral characteristics of ground motion and its correlation with the damage of base-isolated structure

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (10) : 156-161.

DU Yongfeng1,2,WANG Yalong1,LI Hu1,FANG Dengjia1,SHI Chen1

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Abstract

The spectral characteristics of ground motion and the correlation between spectral characteristics and structural damage were studied.The concept and calculation formula were proposed for the frequency matching degree of Fourier spectral intensity, structural modal frequency influence coefficient and magnification factor of pseudo-resonance.A base-isolated structure model for elastic-plastic history analysis was established and used to calculate the structure overall damage index.The correlation between the spectral characteristics and structure damage was studied in regard to the dominant frequency, three major peak frequencies and average frequency.The results show that the structural damage caused due to spectral characteristics is related to the modal frequency of the structure, and the influence of the first modal frequency is the most significant.The greater the frequency matching degree of Fourier spectral intensity, the greater the possibility of structure pseudo-resonance and the greater the damage index of the isolation layer and the upper structure.The magnification factor of pseudo-resonance reflects the damage degree of the structure caused due to spectral characteristics.It is also found that the average frequency is rather good to represent the spectral characteristics of ground motion.

Key words

average frequency / modal frequency / spectral characteristics / damage index / frequency matching degree of Fourier spectral intensity；magnification factor of pseudo-resonance

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DU Yongfeng1,2,WANG Yalong1,LI Hu1,FANG Dengjia1,SHI Chen1. Spectral characteristics of ground motion and its correlation with the damage of base-isolated structure[J]. Journal of Vibration and Shock, 2019, 38(10): 156-161

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