Simultaneously to the drafting of a seismic micro-zonation that highlights the different responses to earthquake that the various areas offer in terms of amplification of ground seismic waves, in relation to the stratigraphy and the orography, it is fundamental to know and predict the effects of an earthquake on urban system. It is therefore essential to carry out an analysis of the existing built heritage in order to know its characteristics, assess the level of vulnerability and identify a scale of intervention priorities, in particular investigating the survey on historical centers, particularly complex contexts, historical interest and potential vulnerability. Starting from these general assumptions set at a territorial scale, every intervention on the construction scale must therefore be conducted taking into account 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 and experimentation was carried out for the Municipality of Carini (province of Palermo, Sicily, Italy) and in particular in its historic center, presenting a medieval origin, a great architectural and urban interest but 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 territory was analyzed in order to define homogeneous zones of seismic vulnerability, based on the knowledge of the existing building heritage and its current conditions. In order to do this, the Sheets developed in the context of a scientific project developed in the university context in accordance with the National Civil Protection (CARTIS first-level Sheets), aimed at the knowledge and cataloguing of the main building typologies existing in the 'territory of the entire municipal area, distinguishing them fundamentally for the structural types and describing recurring characteristics. The second level of investigation, conducting on a scale of greater detail, concerned instead the historic center. The first phase of analysis, in particular, studies the identification of the typological and constructive characteristics of the historic center in terms of the construction materials and prevailing construction techniques, through the analysis of twenty-two isolates identified as a significant sample of the different configurations of urban fabric and buildings. Of these the seismic vulnerability has been evaluated, based on the expedient method devised by the Italian professor Giovanni Mochi, at the University of Bologna, adapting it to the historical-constructive context of Western Sicily. The method consists in the calculation of dimensionless indices, useful for determining the level of vulnerability of the individual aggregates. In the context of the historical center, in fact, the isolated survey approach is more 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.

Parallelamente alla redazione di una micro-zonazione sismica che evidenzi le differenti risposte al sisma che i vari ambiti offrono in termini di amplificazione delle onde sismiche al suolo, in relazione alla stratigrafia e all’orografia del terreno, si rivela fondamentale conoscere e prevedere gli effetti di un sisma sul sistema urbano. È fondamentale quindi effettuare un’analisi del patrimonio costruito esistente al fine di conoscerne le caratteristiche, valutarne il livello di vulnerabilità ed individuare una scala di priorità di intervento, approfondendo in particolare l’indagine sui centri storici, contesti di particolare complessità, interesse storico e potenziale vulnerabilità. A partire da tali presupposti generali fissati alla scala territoriale, ogni intervento alla scala edilizia deve quindi essere condotto tenendo conto degli esiti di tali analisi: sono questi i principi di base che definiscono il Piano Regolatore della Sismicità. Per verificare le modalità attraverso cui i principi sin qui enunciati possono trovare concreta attuazione è stata condotta una ricerca ed una sperimentazione nel Comune di Carini (provincia di PA) ed in particolare nel centro storico della cittadina palermitana, di origine medioevale e di grande interesse architettonico ed urbanistico ma che presenta forti criticità sotto il profilo della sicurezza. Il primo livello di indagine è stato quello a scala territoriale, nel quale è stato analizzato l’intero territorio comunale al fine di definire zone omogenee di vulnerabilità sismica, denominate “Comparti”, sulla base della conoscenza del patrimonio edilizio esistente e delle relative condizioni attuali. Il secondo livello di indagine, a scala di maggiore dettaglio, ha riguardato il centro storico. La prima fase di analisi, in particolare, ha riguardato l’individuazione delle caratteristiche tipologiche e costruttive del centro storico in termini di materiali impiegati e tecniche costruttive prevalenti, mediante l’analisi di ventidue isolati individuati come un campione significativo delle diverse configurazioni dei tessuti urbanistici ed edilizi. Di questi è stata valutata la vulnerabilità sismica, sulla base del metodo speditivo ideato dal professore Giovanni Mochi dell’Università di Bologna, adattandolo al contesto storico-costruttivo della Sicilia occidentale. Il metodo consiste nel calcolo di indici adimensionali, utili a stabilire il livello di vulnerabilità dei singoli aggregati. Nel contesto del centro storico, infatti, l’approccio dell’indagine per isolato risulta essere più adeguato rispetto ad un’analisi relativa al singolo edificio, per via della conformazione stessa del tessuto edilizio, caratterizzata dall’interdipendenza strutturale tra i singoli edifici.

Campisi, T. (2018). HISTORIC URBAN CENTERS. CONSTRUCTION CHARACTERS AND SEISMIC VULNERABILITY. In World Heritage and Knowledge. Representation|Restoration|Redesign|Resilience (pp.1060-1069). Roma : Gangemi.

HISTORIC URBAN CENTERS. CONSTRUCTION CHARACTERS AND SEISMIC VULNERABILITY

Campisi, Tiziana
2018-01-01

Abstract

Simultaneously to the drafting of a seismic micro-zonation that highlights the different responses to earthquake that the various areas offer in terms of amplification of ground seismic waves, in relation to the stratigraphy and the orography, it is fundamental to know and predict the effects of an earthquake on urban system. It is therefore essential to carry out an analysis of the existing built heritage in order to know its characteristics, assess the level of vulnerability and identify a scale of intervention priorities, in particular investigating the survey on historical centers, particularly complex contexts, historical interest and potential vulnerability. Starting from these general assumptions set at a territorial scale, every intervention on the construction scale must therefore be conducted taking into account 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 and experimentation was carried out for the Municipality of Carini (province of Palermo, Sicily, Italy) and in particular in its historic center, presenting a medieval origin, a great architectural and urban interest but 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 territory was analyzed in order to define homogeneous zones of seismic vulnerability, based on the knowledge of the existing building heritage and its current conditions. In order to do this, the Sheets developed in the context of a scientific project developed in the university context in accordance with the National Civil Protection (CARTIS first-level Sheets), aimed at the knowledge and cataloguing of the main building typologies existing in the 'territory of the entire municipal area, distinguishing them fundamentally for the structural types and describing recurring characteristics. The second level of investigation, conducting on a scale of greater detail, concerned instead the historic center. The first phase of analysis, in particular, studies the identification of the typological and constructive characteristics of the historic center in terms of the construction materials and prevailing construction techniques, through the analysis of twenty-two isolates identified as a significant sample of the different configurations of urban fabric and buildings. Of these the seismic vulnerability has been evaluated, based on the expedient method devised by the Italian professor Giovanni Mochi, at the University of Bologna, adapting it to the historical-constructive context of Western Sicily. The method consists in the calculation of dimensionless indices, useful for determining the level of vulnerability of the individual aggregates. In the context of the historical center, in fact, the isolated survey approach is more 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.
Settore ICAR/10 - Architettura Tecnica
giu-2018
World Heritage and Knowledge
Napoli e Capri
14-16 giugno 2018
XVI International forum "Le Vie dei Mercanti"
mag-2018
2018
10
Online
Gli Atti del Convegno sono scaricabili ai seguenti link: https://www.gangemieditore.com/dettaglio/world-heritage-and-knowledge/8202/2, http://www.leviedeimercanti.it/proceedings-xvi-forum/. Il volume degli abstract , edito dall'Editore Cangemi di Roma ha il seguente ISBN:978-88-492-3629-3
Campisi, T. (2018). HISTORIC URBAN CENTERS. CONSTRUCTION CHARACTERS AND SEISMIC VULNERABILITY. In World Heritage and Knowledge. Representation|Restoration|Redesign|Resilience (pp.1060-1069). Roma : Gangemi.
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Campisi, Tiziana
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/291200
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