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The accurate modelling of seismic load is a major topic that has raised particular interest in the literature in the recent years. One of the reasons is the advent of performance based earthquake engineering (PBEE) that has become the state of the art for both civil and nuclear structures. The PBEE generally requires transient analysis in order to evaluate the seismic fragility of structures and components. In consequence, a set of hazard consistent ground motion time histories is needed for the transient dynamic analysis to be performed.

In this paper, a simple procedure for simulating artificial earthquake accelerograms matching the statistical distribution of response spectra, as given by the ground motion prediction equations (median and the standard deviation) and correlation coefficients, is presented. The approach, Zentner (2014), follows the general ideas of the natural ground motion selection algorithms proposed by Baker (2011) and Wang (2011) but using simulated (artificial) “spectrum-compatible” accelerograms. This contribution proposes to perform a number of comparative studies in order to assess the capabilities of the simulated accelerograms. Ground motion intensity measures will be compared to the target from GMPE and to the ones of selected natural accelerograms. Finally, the impact on structural response will be evaluated. In particular, we compare a set of natural accelerograms, selected according to the Baker et al. procedure, to a set of simulated time histories.

Tags: SECED 2015  
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