HISTORIC URBAN CENTERS. CONSTRUCTION CHARACTERS AND SEISMIC VULNERABILITY

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Abstract

Simultaneously to the drafting of a seismic micro-zonation that highlights the different responses toearthquake that the various areas offer in terms of amplification of ground seismic waves, in relation tothe stratigraphy and the orography, it is fundamental to know and predict the effects of an earthquakeon urban system. It is therefore essential to carry out an analysis of the existing built heritage in orderto know its characteristics, assess the level of vulnerability and identify a scale of interventionpriorities, in particular investigating the survey on historical centers, particularly complex contexts,historical interest and potential vulnerability. Starting from these general assumptions set at aterritorial scale, every intervention on the construction scale must therefore be conducted taking intoaccount the results of these analyses: these are the basic principles that define a “Plan of Seismicity”.To verify the ways in which these principles can effectively be implemented, a research andexperimentation was carried out for the Municipality of Carini (province of Palermo, Sicily, Italy) and inparticular in its historic center, presenting a medieval origin, a great architectural and urban interestbut which presents strong criticalities in terms of seismic safety.The first level of investigation has been that on a territorial scale, in which the entire municipal territorywas analyzed in order to define homogeneous zones of seismic vulnerability, based on the knowledgeof the existing building heritage and its current conditions. In order to do this, the Sheets developed inthe context of a scientific project developed in the university context in accordance with the NationalCivil Protection (CARTIS first-level Sheets), aimed at the knowledge and cataloguing of the mainbuilding typologies existing in the 'territory of the entire municipal area, distinguishing themfundamentally for the structural types and describing recurring characteristics. The second level ofinvestigation, conducting on a scale of greater detail, concerned instead the historic center. The firstphase of analysis, in particular, studies the identification of the typological and constructivecharacteristics of the historic center in terms of the construction materials and prevailing constructiontechniques, through the analysis of twenty-two isolates identified as a significant sample of thedifferent configurations of urban fabric and buildings. Of these the seismic vulnerability has beenevaluated, based on the expedient method devised by the Italian professor Giovanni Mochi, at theUniversity of Bologna, adapting it to the historical-constructive context of Western Sicily. The methodconsists in the calculation of dimensionless indices, useful for determining the level of vulnerability ofthe individual aggregates. In the context of the historical center, in fact, the isolated survey approach ismore appropriate than an analysis of the individual building, due to the structure of the building fabric,characterized by the structural interdependence between the individual buildings.
Original languageEnglish
Pages1060-1069
Number of pages10
Publication statusPublished - 2018

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