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Date of Publication:2022-10-10

Journal:大连理工大学学报

Issue:3

Page Number:263-269

ISSN No.:1000-8608

Abstract:A method to simulate the non‐stationary ground motions and fit the design spectrum is proposed based on wavelet packet decomposition and reconstruction .The method simulates ground motions for engineering and adjusts its frequency components so that the response spectrum will fit the design spectrum .Firstly ,the wavelet packet coefficient matrix for ground motion acceleration time history is generated using 5 parameters ,which characterizes the frequency attenuation with duration in real recordings . The acceleration time history can be obtained by wavelet packet reconstruction .Then ,by wavelet packet decomposition the simulated ground motion is decomposed into a desired number of wavelet packet coefficient matrices with high resolution and non‐overlapping frequency contents ,and then the frequency component is adjusted for matching the response spectrum of the simulated accelerogram with specified design spectrum .Numerical example demonstrates that the acceleration time histories with different durations simulated by the proposed method all fit the design spectrum .The accelerograms keep the non‐stationarities of ground motion even after iteration . Moreover ,the method is stable and fast for convergence ,and can achieve high fitting accuracy in limited iteration times .

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