Correlation in spectral accelerations of italian ground motion records

Abstract eng:
The shape of a uniform hazard spectrum has been criticized to be a) unrealistic for a site where the spectral ordinates of the UHS at different periods govern by different scenario events and b) conservative for long-return-period earthquake shaking. Baker and Cornell introduced the Conditional Mean Spectrum (CMS), which considers the correlation of spectral demands at different periods, to address these issues. A CMS estimates the median geometric-mean spectral acceleration response of a pair of ground motions given an [M, r] pair and a target spectral ordinate, Sa(T1), for which ε(T1) is calculated using an appropriate attenuation relationship. This paper develops a model for ρε(T1)ε(T2) , a key component for developing a CMS, using Italian earthquake records from an European ground motion database. Epsilon (ε) for each record is computed using both Ambraseys and Sabetta & Pugliese ground motion attenuation relationships. The model can be used to develop CMS for Italian sites.

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