PSI - Issue 44

Giuseppina De Martino et al. / Procedia Structural Integrity 44 (2023) 1816–1823 Giuseppina De Martino et al. / Structural Integrity Procedia 00 (2022) 000–000

1817

2

1. Introduction The 2017 Ischia Island earthquake (an earthquake (ML3.6; MW3.9; Md4.0) hit 3 municipalities (Casamicciola Terme, Lacco Ameno and Forio) [Briseghella et al. (2019)]. The damage and usability assessment of the ordinary buildings started few days after the earthquake to assess whether they could be safely used in the case of aftershocks. About 2000 AeDES forms [Baggio et. al., (2007)] were filled for ordinary buildings (i.e. residential, production, office, business, touristic, public and strategic services). They refer to 1396 buildings (several surveys were carried out twice), out of which 1204 residential buildings. The requests for the damage and usability assessment of the buildings were handled through the Erikus software - Emergency and Structural Unit Survey Requests, developed by the Seismic Sector of the Piedmont Region and Arpa Piemonte with a procedural model designed by Civil Protection Department. It is an application for the management, at the municipal level, of post-seismic event survey campaigns to assess the damage and usability of buildings. The Erikus software has been used for the first time after the 2016 Central Italy earthquake. The Piemont Region under request of the Civil Protection Department provided technicians for a phase of training, development, data collection, management, and dissemination. The software allows to prepare all documentation useful for the damage and usability survey campaign and, once the survey has been carried out, to georeference the inspected buildings (complete with any georeferenced photographic documentation) and relevant usability ratings. Furthermore, daily reports, printing of maps and monitoring of the entire cycle of technical operations can be carried out with Erikus software. Once the emergency phase ended, the reconstruction process of the buildings damaged by the 2017 Ischia earthquake started under the management of the Commissarial Structure issued by Decree Law No. 109/2018. The Structure of the Commissioner upgraded the Erikus software to Erikus -ric software to digitize and georeference several useful information for the reconstruction process including all the information related to the technical surveys to assess the structural damage and usability on about 1,400 buildings along with data from applications for funding. In this paper, the data collected in the post-earthquake by means of Erikus_ric on 928 masonry residential buildings in terms of construction age, buildings characteristics, structural types and damage levels to vertical structures are presented and discussed. Finally, the cross-correlations between the building damage and the buildings’ characteristics, is investigated defining the building damage state, DS , per building and grouping the dataset in different vulnerability classes according to Dolce and Goretti (2015) classification. The DS have been defined converting the damage levels to vertical structures into global building damage according to metric conversion rules reported in Dolce et al. (2019). 2. Erikus_ric software The “ Structure of the Commissioner ”, based on the fruitful activity already carried out with the Erikus software, has implemented a territorial information system, called Erikus-ric, for the management of the reconstruction phase. The Erikus-ric software, starting from Erikus software, was enriched with the implementation of new information layers (Fig. 1). It enabled the storage of all data from the different sections of the AeDES form filled for ordinary buildings. The data of damage and usability ratings of cultural heritage buildings and churches have been added. In the Erikus-ric software, the information layers related to the perimeter of the Territorial Landscape Plan (PPT) and those of the different zones of the General Regulatory Plan (PRG) were loaded, as well as the building amnesty applications, the perimeters of the hydrogeological and seismic hazard and risk levels, the mapping resulting from seismic microzonation studies of level III, and the delimitation of the Red Zone with the inherent capacity of spatial information systems to continuously update over time.