Seismic response of a stock of social housings in Italy with r.c. and masonry materials

The paper is based on a survey activity on a subset of 48 buildings for social housings. The structural materials are R.C. and Masonry. They are representative of about 9000 social ats on the district of Leghorn (Italy), built from early '900 up to 1981, date of adoption of seismic norms. The subset is divided into 15 masonry structures and 33 r.c. frames. Two different methods are adopted to classify the stock from seismic point of view. The stock has been classified in terms of Iv (Vulnerability Index) through GNDT 2ø level forms and PGA (Peak Ground Acceleration) from operation and collapse limit states (SLO and SLC), calculated by SAVE procedure. An example of classification, to establish priorities for further seismic investigations, is furnished. Main recurrent vulnerable details are highlighted, together with perspectives for more detailed seismic analysis