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  • Aggiornamento delle mappe di rischio sismico in Italia

    Seismic risk maps updated on the basis of new data about real estate are presented in this paper. Previous maps were presented in 1996 by a specific workgroup appointed by Italian Civil Protection Department and they were used to make a list of municipalities at high seismic risk that were granted tax relief depending on vulnerability reduction interventions. Furthermore, those maps were updated with the hazard assessment developed after 1998. Real estate and population data resulted from Istat Census of 1991. In this updating, data from Istat Census of 2001 have been used, but hazard assessment and the methodology were the same of the previous maps, in order to evaluate the impact of a different structure of the real estate on risk assessment.
    All the evidence makes it clear that the distribution and the overall assessment confirm the previous evaluation based on 1991 data, in spite of a 9% real estate increment, from 1991 to 2001. Specific data processing has pointed out differences in structural characteristics of the real estate from 1991 and 2001 Istat Census, reducing its estimated vulnerability, in compensation of the exposure increment due to the real estate increment.

    This paper is available in Italian only.

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  • Nuovi strumenti per lo studio della risposta sismica di strutture irregolari in pianta

    SUMMARY – New tools for the analysis of the seismic behaviour of plan-asymmetric structures are herein presented and discussed. In particular, the concept of Polar Spectrum is firstly introduced to feasibly describe the spatial features of the seismic event. Limit domains are then used to investigate the non-linear behaviour of plan-asymmetric structures. The results obtained by the discussed procedure have been compared with non-linear dynamic analyses by using a benchmark structure.

    This paper is available in Italian only.