The seismic design of most civil structures is usually accomplished using the response spectrum approach or\r\nsimplified equivalent lateral force methods. However, some special tasks require the use of dynamic time history\r\nanalyses. In the nuclear industry, for example, dynamic analyses are required in the design verification and seismic\r\nassessment of critical buildings and in the development of floor response spectra and free-field ground response\r\nspectra. The input motion for these analyses requires acceleration time series whose response spectrum matches a\r\ntarget design spectrum. This article revises the continuous wavelet transform (CWT) approach to generate\r\nspectrum-compatible records from the modification of acceleration time histories recorded in actual seismic events.\r\nThe computational efficiency of the algorithm is increased greatly by performing the wavelet decomposition and\r\ndetails reconstruction via fast convolution using fast Fourier transforms. The new algorithm is evaluated using a\r\ntypical design spectrum from the nuclear industry and different seed records.
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