Seismic Vulnerability Assessment of Historical Urban Centres: The Case Study of Campi Alto Di Norcia, Italy

Abstract

Abstract. Seismic damage assessment is a valuable opportunity to evaluate the accuracy of vulnerability and risk methodologies applied to historic masonry buildings, giving the possibility of enhancing and optimizing mitigation and retrofit strategies. Vulnerability index methodologies are flexible and powerful tools for the seismic assessment at urban scale, able to provide a first screening of the critical issues present in masonry structural aggregates. The different structural features of the buildings, directly and indirectly influencing their structural behaviour, are measured through different weights and scores finally achieving a vulnerability indicator. In the present paper, four different vulnerability index methodologies are applied to the medieval city of Campi Alto di Norcia in Valnerina, Umbria, recently stroke by the 2016 Central Italy earthquakes. The accuracy of the adopted Iv methods is assessed based on the real damages’ analysis performed in the surrounding area, comparing results achieved from the application of considered methodologies to direct in-situ observations. Data collected during the 2016 post-earthquake damage surveys and usability assessment, together with the external visual inspections carried out and with the information coming from retrofitting design interventions performed between 1979 and 1997, are used.

Comparative analysis of a new assessment of the seismic risk of residential buildings of two districts of Barcelona

“…The VIM_P methodology is a derivation of the VIM that allows determining seismic risk scenarios. The VIM methodology is related to valuable and extensive work developed in the last 25 years in different countries with emphasis on some European countries as Italy, Spain, Greece, among many others (see for instance Vacareanu et al, 2004;Faccioli et al, 2004;Giovinazzi, 2005;Lagomarsino and Giovinazzi, 2006;Barbat et al, 2006;Dolce et al, 2006;Bernardini, 2007a, b;Barbat et al, 2009;Vicente et al, 2011;Neves et al, 2012;Ferreira et al, 2013Ferreira et al, , 2017aAthmani et al 2015;Basset-Salom 2015, 2020;Ruiz et al 2015;Cherif et al 2016;Lestuzzi et al 2016;Maio et al, 2016;Apostol et al, 2019;Giuliani et al, 2019;Ortega et al, 2019;Ademović et al 2020;Basset-Salom and Guardiola-Víllora, 2020;Kassem et al, 2020;Romis et al, 2020;Taibi et al, 2020). Recently, Aguilar-Meléndez et al (2019a) highlighted that the seismic risk results obtained according to the VIM_P agree with the results determined through the application of the VIM.…”

A integração do BIM na reabilitação de «agregados» em alvenaria

“…As deficientes ligações entre os elementos construtivos e o mau estado de conservação destas estruturas são a causa maior da sua vulnerabilidade. Para superar os elevados custos computacionais da modelação numérica e a necessidade de recolher uma enorme quantidade de dados de diferentes tipos, foram propostos vários métodos empíricos à escala territorial para uma rápida avaliação da sua segurança [1]. Estas abordagens não são comparáveis com os métodos numéricos mais precisos, cuja implementação requer a colaboração de vários atores distintos.…”

“…Estas abordagens não são comparáveis com os métodos numéricos mais precisos, cuja implementação requer a colaboração de vários atores distintos. Assim, a melhoria da capacidade de colaboração das diferentes partes envolvidas é um passo fundamental para melhorar a avaliação da resposta sísmica de agregados em alvenaria [1]. Por esta razão, uma abordagem baseada no BIM pode ser muito útil para esta implementação.…”