Improved method of generation of artificial time‐histories, rich in all frequencies, from floor spectra

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Abstract A method to generate artificial time‐histories from given floor response spectra is presented in this paper. The original method proposed by Levy and Wilkinson1 is modified. New iterative equations are developed, based on extensive computational experimentation, to speed up and stabilize the convergence process. The present approach, when applied to spectra with peaks in the high frequency range (40 to 100 Hz) along with seismic peaks, converges very closely to the target spectra within eight iterations regardless of damping values. The original computer program for synthetic time‐history generation was developed on the UNIVAC 1100 series computer. This program was converted to work on the IBM PC. The PC based program ‘MICRO‐SEIM’ saves the response spectra generated at each iteration and the final synthetic time‐history on the PC diskette. The post processing program reads those saved data from the diskette and plots the spectra and time‐history.

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