Spectrum-compatible earthquake time histories have been widely used for seismic analysis and design. In this paper, a data\r\nprocessing method, Hilbert-Huang transform, is applied to generate earthquake time histories compatible with the target seismic\r\ndesign spectra based onmultiple actual earthquake records. Each actual earthquake record is decomposed into several components\r\nof time-dependent amplitude and frequency by Hilbert-Huang transform. The spectrum-compatible earthquake time history is\r\nobtained by solving an optimization problem to minimize the relative difference between the response spectrum of the generated\r\ntime history and the target seismic design spectra. Since the basis for generating spectrum-compatible earthquake time histories\r\nis derived from actual earthquake records by employing the Hilbert-Huang transform, the nonstationary characteristics and the\r\nnatural properties of the seed earthquake records are well preserved in the generated earthquake time histories.
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