Seismic Input Characterization For Some Sites
In Italy
Author(s)
D. Rinaldis & P. Clemente
Abstract
The seismic input characterization is the first task in the analysis of the seismic
behaviour of a structure. The definition of the seismogenetic sources, earthquake
catalogue and site characteristics are preliminary to the study. The seismic input
may be represented by means of a response spectrum or time-histories. There are
many methodologies to produce response spectra and/or input time histories for a
given site. The approach may be probabilistic, strictly deterministic or a mixture
of both. A strictly deterministic approach is based on the identification of the
maximum credible earthquake within an accepted return period. This can be
achieved by taking into account both the seismicity historically observed at the
site and the features of the seismic sources able to affect the site. The
probabilistic hazard assessment is based on Cornell's methodology; it requires
the definition of homogeneous seismic sources, their characterization in terms of
maximum expected magnitude and Gutenberg-Richter relation (recurrence of
events in different magnitude classes) and the choice of an attenuation law for
seismic energy, according to the selected ground motion parameter. The
methodology proposed by ENEA perform all tasks of the deterministic approach
but requires also the comparison between the Fourier amplitudes of the selected
time histories with the Uniform Hazard Spectrum (UHS) recovered from the
probabilistic approach by means of a statistical index indicating the best fitting.
Two case studies are shown.
Keywords: seismic input, seismic hazard, deterministic approach, probabilistic
approach, risk analysis.
Keywords
seismic input, seismic hazard, deterministic approach, probabilistic
approach, risk analysis
Related Book
Other papers in this volume
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