Simulation of earthquake ground motions with seismic physical characteristic

Abstract eng:
A methodology is proposed to simulate artificial non-stationary earthquake acceleration time histories with the seismic physical characteristic in this paper. The methodology is based on the Priestley’s theory of non-stationary random processes with Evolutionary Power Spectral Density Function(EPSDF).The relationship between the acceleration evolutionary power spectral density function and the seismic Fourier Amplitude Spectra(FAS) is established, then by combining the EPSDF which takes into account the seismic physical characteristic with the engineering spectral representation method, the methodology to simulate artificial earthquake ground motions with seismic physical characteristic in the present work is presented. To evaluate the performance of the proposed methodology accelerations, four station earthquake acceleration records of the Northridge were simulated, some response and seismic variables such as response Fourier amplitude spectra were computed, the results were compared with actual earthquake obtained in the stations, the comparison shows that the simulation coincides well with the actual one. The merit of the proposed method is the simulation earthquake acceleration records consistent with the seismic characteristics of the sites where the structure will be constructed by combining the EPSDF with the spectral representation method. The simulation acceleration records can be used to earthquake-resistant analysis of the region where seismic activity is importantly but recorded acceleration time history is scarce.

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