سال انتشار: ۱۳۸۲

محل انتشار: چهارمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله

تعداد صفحات: ۸

نویسنده(ها):

Maurizio Leggeri – Structural and Geotechnical Engineer-Archstudio, Via F.Baracca 175, Potenza 85100, Italy; President Center of Integrated Geomorphology for the Mediterranean Area

چکیده:

In Italy, prior to the earthquake of November 23, 1980 only 652 municipalities (from 34
provinces) and others in the state of Calabria (totalling about 1000 towns) were officially
included in the seismic zonation map, in spite of the historical evidence of past ruinous events
that devastated wide zones of the Peninsula. It was only the earthquakes of Friuli in 1976 and
Campania-Basilicata in 1980 that finally forced the public and politicians to focus attention on
the seismic risk. Seismic risk prevention and protection has been neglected in Italy for a long
time. These earthquakes rekindled the discussion of earthquake hazards, including the data
gathering and prediction of the natural phenomenon in a timely manner so as to manage our
cities more efficiently when an earthquake strikes. At present, the number of municipalities in
seismic zones in Italy is about 4000. The principal problem concerns the building stock built
without seismic design considerations in the years between World War II and 1981.
Consequently it is essential to develop and improve the strengthening techniques to characterize
the seismic risk in these areas. In Italy remarkable efforts were made in recent years in the
scientific search for the prevention of seismic risk, with notable contribution offered by the
interpretation of the data from the monitoring network. Advanced local nets, are now being
developed. Thus valuable tools of evaluation are now available and were used on the occasion
of the recent earthquakes that struck Umbria (in 1997) and the southern Basilicata (in 1998).
This paper will discuss how local seismic risk is defined (particularly in the Basilicata Region)
and provide some significant examples of housing construction and retrofit for typical buildings
in the area. The discussion will focus on reinforced concrete frame construction predating
seismic codes and will include architectural, structural features and deficiencies and seismic
strengthening techniques