Code-compliant accelerograms adopted for time-history dynamic analyses are required to be compatible with the elastic design spectrum defining the seismic action. The problem then arises to generate spectrum-compatible accelerograms while maintaining realistic non-stationary characteristics, which in turn may play an important role in the non-linear seismic response. In this paper, the harmonic wavelet analysis is resorted to as a potent tool to: first, deterministically modify an accelerogram

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... o match the target spectrum; second, to randomly generate an arbitrary number of signals with the same non-stationary characteristics of the parent accelerogram.