Simulation of ground motion field related to known field points

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (3) : 242-249.

YE Jihong1, LI Guijie2

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Abstract

Here, an earthquake ground motion field model related to known field points was proposed.Firstly, the engineering frequency band (0-
25 Hz) was divided into several non-overlapping segments as sub frequency bands, and within each sub-band, ground motion was taken as superposition of surface wave and body one.Then, key factors affecting amplitude value spectrum of synthetic ground motion in each sub-band were determined and introduced into the proposed model so that both amplitude value spectrum and power spectrum of synthetic ground motion within each sub-band were consistent to the known ones.Furthermore, according to the similarity between frequency distribution of phase difference spectrum and envelope of ground motion intensity, the phase difference spectrum as a key factor to determine the non-stationary of ground motion intensity was introduced into the proposed model to make the waveform of the synthetic ground motion similar to that of the known ground motion.Finally, the coherence among different field points was described by the frequency dispersion curve and distance parameters in the model to extend synthetic ground motion to the ground motion field model.The example simulation results of the ground motion field related to El Centro seismic wave field points showed that the proposed model can not only realize the power spectrum of the synthetic ground motion field being full consistent to those of El Centro seismic wave field points, but also the coherence is reasonable, so the proposed model can be applied in engineering analysis.

Key words

known site points / synthesis of ground motions / ground motion field / correlation

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YE Jihong1, LI Guijie2 . Simulation of ground motion field related to known field points[J]. Journal of Vibration and Shock, 2020, 39(3): 242-249

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