[1]DONG Di,JI Jinbao,YUAN Meiqiao,et al.Research on Frequency Time Series Model Based on Engineering Application[J].Journal of Seismological Research,2020,43(01):155-165.
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Research on Frequency Time Series Model Based on Engineering Application
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
43
Number of periods:
2020 01
Page number:
155-165
Column:
Public date:
2020-01-30
- Title:
- Research on Frequency Time Series Model Based on Engineering Application
- Keywords:
- Ground motion; Time-frequency characteristics; Wavelet transform; Frequency non-stationary
- CLC:
- P315.91
- DOI:
- -
- Abstract:
- In this paper,3 551 sets of earthquake records from the NGA database were grouped according to the site condition,the moment magnitude and the epicentral distance. And then the wavelet spectrum of each earthquake record was calculated by using one-dimension continuous wavelet transform. In order to obtain time-frequency statistical characteristics of ground motion for engineering applications,the time dependent predominant frequencies corresponding to the maximum values of wavelet spectrum at every time were considered. And the root mean square of the predominant frequencies within a short time window in every group of ground motion was computed to obtain time series curves of predominant frequency. The results show that the predominant frequency of ground motion gradually decreases with the increasing of time,and the time series of predominant frequency in vertical component seems more remarkable than that in the horizontal component. Furthermore,a linear model,together with an exponential model and an exponential trigonometric model were used to fit the time series curves of the predominant frequency. Meanwhile,the effects of site condition,moment magnitude and epicentral distance on the time-varying curves of the predominant frequency were analyzed. Finally,the fitting parameters of the time series curves of predominant frequency in horizontal and vertical directions in each group were given.
- References:
- -
- Similar References:
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Last Update:
2020-01-30