Generation of Artificial Earthquake Wave Compatible with Design Spectrum

Abstract eng:
In seismic response analysis of building structures, the input ground motions have considerable effect on the nonlinear seismic response characteristics of structures. The characteristics of soil and the locality of the site where those ground motions were recorded affect the contents of ground motion time histories. Therefore, it is difficult to select appropriate input ground motions for seismic response analysis. This study describes a generation of synthetic ground motion time histories compatible with seismic design spectrum, and also evaluates the seismic response results of multi-story reinforced concrete structures by the simulated ground motions. The simulated ground motions are generated according to the previously recorded earthquake waves in the past major earthquake events. The simulated ground motion time histories have identical phase angles to the recorded ground motions, and their overall response spectra are compatible with seismic design spectrum with 5% critical viscous damping. The purpose of this study was to investigate their validity as input ground motion for nonlinear seismic response analysis of building structures. As expected, the response quantities by simulated ground motions presented better stability than those by real recorded ground motions. It was concluded that the simulated earthquake waves generated in this paper are applicable as input ground motions for a seismic response analysis of building structures.

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