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Seismic risk
OVERVIEW OF THE WORKSHOP “SEISMIC RISK IN THE PO PLAIN”
On Nov. 24th 2010, for the anniversary of the 2004 earthquake of Valsabbia and Garda, a workshop on “Seismic risk in the Po Plain” took place at Brescia. The conference was organized by CeSiA (Applied Seismology and Structural Dynamics Research Center), a research center of the University of Brescia, with the cooperation of the Museo Civico di Scienze Naturali of Comune di Brescia, which, moreover, hosted the meeting. The workshop belongs to a cycle which started in 2006 (information on the previous events is available at http://cesia.ing.unibs.it/).
The workshop topic, which respects the aims of CeSiA, is very interesting since the Po Plain includes areas of moderate but complex seismicity; some of these areas have only recently been classified as seismic by the norms. Thus researchers deem necessary both further geologic and seismologic studies and seis- mic risk assessments of an area characterized by an intense urbanization, which in great part occurred in the absence of adequate seismic rules.
After the opening by the President of CeSiA, Claudio Giorgi, by the Director of Museo Civico di Scienze Naturali, Paolo Schirolli, by the alderman for Culture of Comune di Brescia, Andrea Arcai, by the President of Ordine degli Ingegneri della Provincia di Brescia, Marco Belardi, the workshop, attended by about one hundred people (both technicians or professionals and researchers) included two sessions, “Seismic hazard in the Po Plain” and “Seismic Vulnerability in the Po Plain”.
This presentation briefly describes the workshop programme.
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.
Tecniche di valutazione del rischio sismico dei complessi ospedalieri
Seismic risk assessment of existing buildings is a very complex topic for researchers and engineers. Seismic evaluation of hospitals is quite more difficult, because of structurals, functionals, and equipments complexity. The paper, after a overview on current practice in this field, will finally present a case study, the hospital of Arzignano (Vicenza, Italy). Not only the structural safety, but also the assessment of non structural building elements are discussed.
This paper is available in Italian only.