sessione 2.3 - Ogs

GNGTS 2009 SESSIONE 2.3
ries to be used as meaningful design input. The “spectral cloud” is defined as the ensemble of the
spectral ordinates, computed at multiple reference periods, of a group of seismic records (Fig. 1).
If, in addition to the complete knowledge of the characteristics of the distribution of the random
variables, were the autocorrelation functions of the response spectra known, the response spectra
could be seen as a set of signals of a stochastic process.
The identification of earthquake inputs of given hazard is generally obtained through a two-step
association. The first step encompasses the association between an exceedance probability,
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