PSI - Issue 44

Laura Gioiella et al. / Procedia Structural Integrity 44 (2023) 1808–1815 Laura Gioiella et al. / Structural Integrity Procedia 00 (2022) 000–000

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landscape or hydrogeological constraints. The Shake Maps provided the Peak Ground Accelerations (PGAs) for a given event by a seismological based interpolation algorithm that exploits the available data of the observed ground motions and the available seismological knowledge. The AeDES form is a scheme for the quick detection of damages, the definition of emergency measures and the evaluation of post-event safety usability of buildings hosting homes and/or services. This form has been used in Italy since the 1997 Umbria-Marche earthquake and contains information on the building properties, that have been compared with those provided by the SNAES, and a section referred to the damages occurred to the main structural components before and during a seismic event. This way, the database selects, elaborates, and organizes the data of the different sources, producing information used successively for the damage model, like structural typology, floor surface, geolocation, extent of damage and seismic intensity experienced during the Central Italy sequence of 2016 for each of the 1240 school buildings. All these data can be also used for further investigations and statistical processing. Fig. 1 a) and b) show, respectively, the map with the geolocation of the 1240 school buildings and the example of the information collected for every single building.

a

b

Schools located into the five provinces of the Marche region Ancona

Ascoli Piceno

Fermo

Macerata

Pesaro-Urbino

Fig. 1. Database information: (a) geolocation of school buildings; (b) example of the deductible information for the single school.

2.2. The central Italy seismic sequence and AeDES forms acquisition The 2016 Central Italy seismic sequence is characterized by a significant number of events, among them the four main shocks are the M w =6.1 recorded on August 24 th 2016 close to Amatrice, the two occurred on October 26 th close to the towns of Visso, Ussita and Castelsantangelo sul Nera, characterized, respectively, by a M w =5.4 and M w =5.9 and the fourth earthquake occurred on October 30 th with a M w =6.5 close to Norcia. During the first mainshock the PGA recorded nearby the epicentre was about 0.45 g, while the one recorded during the last mainshock was about 0.48 g. Between August 2016 and January 2017, the area was interested by about 6500 aftershocks with M w ranging from 2.3 to 5.5. Fig. 2 shows the location of epicentres of the four main events occurred between August and October, together with the geolocation of the school buildings of the Marche region and the related range of PGA experienced during the seismic sequence. The PGA, indeed, has been chosen as intensity measure of the seismic action and, starting from the shake map of the single event, a value of the PGA, i j , has been associated to each j- th school building as a function of its geolocation, with respect to the epicentre of each event. After the four mainshocks of the Central Italy seismic sequence, 658 AeDES forms related to buildings hosting schools have been collected. Among them, 281 have been filled after the 24 th august event and 203 are related to structures that suffered damages ( d >0). After the events occurred on 26 th and on 30 th of October, further 377 AeDES forms have been filled, with the result of 210 buildings damaged ( d >0). It is worth to note that among the 658 acquired forms, some could be related to the same building that has been inspected twice, once after the event of August and successively after the shocks of October. The procedure chosen in these situations establishes that the