Seismic Action To Withstand The Structures:
The Case History Of 2009 Abruzzo Earthquake
Author(s)
M. Maugeri, G. Totani, P. Monaco & S. Grasso
Abstract
The evaluation of the seismic action which the structures must withstand is the
most critical item of the full process of analysis, monitoring and mitigation of
seismic risk. Seismic action has been recorded worldwide for moderate to severe
earthquakes. In the last 30 years the recorded accelerations have significantly
increased. One reason could be due to the increasing number of recorded stations
and to the location of a considerable amount of recorded stations on soft soil,
where significant site amplification can occur. By the way the recorded
accelerations have exceeded the designed acceleration given by seismic codes.
That particularly occurs in the case of strong earthquakes, where the evaluation
of seismic action given by source mechanism gives, in some cases, a seismic
design earthquake greater than that given by the probabilistic evaluation reported
by the codes.
Also in the case of the moderate ML = 5.8 Abruzzo earthquake, the recorded
acceleration exceeded the provisions given by Italian Code. Mainly two factors
could explain that. One factor is related to the different results obtained by the
probabilistic evaluation of seismic action given by the codes and the
deterministic seismic action evaluated by source modelling of the scenario
earthquake. The second factor is related to the role of site amplification, which is
higher for small to moderate earthquakes and lower for severe scenario
earthquakes. These two factors are discussed for the case of the Abruzzo 2009
earthquake, where, because of the normal fault mechanism, severe vertical
components of the acceleration were recorded; also significant site effects
occurred, particularly in the Aterno valley.
Keywords
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