An Improved Source Model for Simulation Near-Field Strong Ground Motion Acceleration Time History

Abstract:

The key to near-field strong ground motion simulation based on stochastic finite fault method is to determine the spectrum of ground motion. We present an improved source spectrum model for simulation near-field strong ground motion acceleration time history. We combine Masudas source spectrum model with scaling factor H_ij to keep radiation energy conservation and reflect the energy decrease with frequency at low to mid frequencies. We calculate the Fourier amplitude spectrum F_a, accelerate response spectrum S_a, velocity response spectrum S_v and displacement response spectrum S_d of simulation time histories. By comparative analysis of the laws of spectrum values (F_a, S_a, S_v, S_d) with the variation of frequency or period, we discusses the effects of sub-fault dividing scheme, the method of determining scale factor and source spectrum model on spectrum values (F_a, S_a, S_v, S_d). The results show that sub-fault dividing scheme has slightly effect on the model presented in this paper, and the model enable to reflect the sink laws of source spectrum value in mid-to-low frequencies well. We demonstrate that the improved model is superior to other commonly used models.

• Periodical: Applied Mechanics and Materials (Volumes 438-439)
• Pages: 1474-1480
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.438-439.1474
• Online since: October 2013
• Authors: Ju Fang Zhong, Long Wei Zhang, Jun Wei Liang
• Keywords: Acceleration Time History Simulation, Fourier Amplitude Spectrum, Near-Field Strong Ground Motion, Response Spectrum, Source Spectrum Model, Stochastic Finite Fault

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