PSI - Issue 44

Gianluca Fagotti et al. / Procedia Structural Integrity 44 (2023) 339–346 2 Gianluca Fagotti et al./ Structural Integrity Procedia 00 (2022) 000 – 000

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1. Introduction For the management of the post-earthquake rebuilding 2016, the Legislative Decree 189/2016 provided for the Extraordinary Commissioner to carry out his duties, also by means of ordinances. To cope with difficulties that emerged during the first rebuilding phase, the Legislative Decree 76/2020 introduced a significant strengthening commissioner's powers in derogation from the current legislation. The Extraordinary Commissioner has therefore, among others, the task of identifying urgent and particularly critical interventions and works, also in relation to the historical centers rebuilding of the municipalities hardest hit by the 2016/2017 seismic events, in order to arrange the acceleration measures necessary to ensure their fastest and most effective implementation. In order to achieve an immediate implementation of the interventions and ensure a rapid recovery of the territories damaged by the earthquake, both in terms of relaunching the normal living conditions of the population, and to support the restoration and restart of the economic activities present therein, with the ordinances have been provided for derogating provisions of the regulations in force, with particular regard to the rules of the code of public contracts, taking into account that the rebuilding ’s needs are of such complexity that they cannot be effectively addressed with ordinary procedures. The Special Ordinance no. 18/2021 entrusts the rebuilding of Castelluccio’s entire village, almost entirely destroyed by the seismic crisis of 2016, to the public management, within a single recovery program that integrates the construction of primary services and the restoration of both public and private buildings, in order to allow the complete rebuilding of the forma urbis , by restoring the morphology of the soil and the configuration of public and private spaces. The Umbria Rebuilding Special Office is identified as the implementing body for the implementation of the interventions which procedural simplifications have been envisaged. The Ordinances defines the actions and activities that have been implemented to start the overall rebuilding of Castelluccio’s historical center, identifying the works whose rebuilding or restoration takes on a particularly urgent and critical nature in relation to both intrinsic functions and characteristics, and to purposes the rebuilding of the social and economic fabric. 2. Current situation - after the 2016 earthquake Castelluccio, 1452 m.s.l.m., is a fraction of Norcia’s Municipality, located in the easternmost part of the territory, between the mountain ranges of Monte Vettore (2470 m) and Monte Patino (1885 m). Below the town extends the Conca di Castelluccio, a great depression at an altitude between 1250 and 1350 meters, surrounded by particularly high hillsides, which make the area unique and a source of tourists attraction. The area is divided into the so-called Castelluccio’s Piani: Pian Perduto, Pian Grande and Piano Piccolo, covering an area greater than 17 sq km.

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Fig. 1. (a) Castelluccio of Norcia view. (b) State of the places after the 2016 earthquake.

The Castelluccio’s historical events date back to some centuries prior to 1200, the date of the first mention in the archive. Castelluccio’s history is also linked to the tectonic and seismogenic characteristics of its territory. For seismic events of the past there are certain sources starting from 1703; in more recent times, we recall the several damages as a result of the earthquake of 9 September 1979 (epicenter Valnerina), of the seismic events that occurred in the area in 1997, up to the earthquake of 2016, which highlighted the inadequacy, determining numerous collapses especially in the country’s central area. Currently Castelluccio ’s buildings are almost entirely destroyed: the massive damage