Characteristic periods and intensity indexes for far-field long-period ground motion frequency spectra

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (7) : 211-219.

WANG Bo1 LIU Bo-quan1 Wu Tao1 DAI Hui-juan2

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Abstract

At present, there are no characterization parameters of characteristic period and intensity indexes of aseismic analysis for far-field long-period ground motion frequency spectra. Here, 40 far-field long-period ground motions were selected, and 12 types of representative frequency spectra’ characteristic period parameters and 20 types of intensity indexes for each ground motion were calculated using codes programmed with MATLAB. The characteristics of period parameters were analyzed based on the average value and variant coefficient’ calculation results of long-period ground motion frequency spectra’ characteristic periods. Besides, the correlations between intensity indexes and earthquake responses of far-field long-period ground motions were analyzed through calculating correlation coefficients between 20 types of intensity indexes and 5 types of maximum seismic responses including max acceleration, max velocity, max displacement, max input energy and max hysteretic dissipation energy of 400 single-DOF systems with two varying parameters of natural period and ductility factor. The study results showed that different period parameters reflect different frequency spectral characteristics, and their stabilities also have larger differences; Hilbert marginal spectral average period Tmh is suggested as the characterization parameter of characteristic period for far-field long-period ground motions; correlations between intensity indexes and maximum seismic responses are related to types of intensity indexes, natural periods and ductility factors; peak ground velocity PGV and peak ground displacement PGD have better correlations with maximum seismic responses under different natural periods, correlations grow with increase in natural period; so PGV and PGD are suggested as aseismic analysis intensity indexes for far-field long-period ground motions.

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far-field long-period ground motion / characteristic period / intensity index / single-DOF system / correlation analysis

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WANG Bo1 LIU Bo-quan1 Wu Tao1 DAI Hui-juan2. Characteristic periods and intensity indexes for far-field long-period ground motion frequency spectra[J]. Journal of Vibration and Shock, 2018, 37(7): 211-219

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