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

1819

4

RC buildings

Masonry buildings

Mixed, steel or other structural type

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30%

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Usability rating A A/F B-C B-C/F E E/F

Usability rating A A/F B-C B-C/F E E/F

Usability rating A A/F B-C B-C/F E E/F

(a)

(b)

(c)

Fig. 2. Distribution and cumulative percentage for (a) RC buildings, (b) masonry buildings and (c) mixed buildings as function of usability rating.

4. Masonry Buildings characteristics A sample of 928 masonry residential buildings assessed by means of AeDES form has been extracted from the complete database and has been investigated in this study. Out of 928 buildings, 590 are located in Casamicciola Terme municipality, 294 in Lacco Ameno municipality, 38 in Forio municipality. For 6 buildings the information is not available. The distribution of buildings and relevant cumulative percentage as a function of the construction age, number of stories and average surface floor area are presented, respectively, in Fig. 2a, b and c. The construction age has been grouped in twelve classes according to AeDES form. Fig. 3a shows that about 70% of the dataset has been built before 1972. The majority of buildings in Casamicciola Terme were built after the year of seismic classification of the municipality (i.e. Royal Law n.640 1935). Thus, 276 were designed with reference to obsolete seismic provisions and 233 for gravity loads only. As concern Lacco Ameno and Forio municipalities more than 85% of buildings were built before the year of seismic classification of the belonging municipalities, which took place with Ministerial Decree 1981 Thus, resulting 44 seismically designed and 283 designed only for gravity loads. As concern the average surface area (see Fig. 3b) and number of storeys (see Fig. 3c), the graphs show that the buildings have small dimensions. On average, the surface area is 107.51 m 2 and the buildings are mainly characterized by 1-2 storeys (96% of the sample, with 1-storey buildings representing 68% of the dataset).

100%

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N. buildings

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% buildings

% buildings 300

% buildings

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>4

Costruction age

N. storeys

Average surface area [m 2 ]

(a)

(b)

(c)

Fig. 3. Distribution and cumulative percentage for masonry buildings as a function of (a) construction age, (b) number of storeys and (c) average surface area.

According to data collected by Sect. 3 of the AeDES form, four vertical structural types and five horizontal structural types are identified and shown in Fig. 4; note that data on masonry quality and horizontal structural type is not available for 20 buildings and 77 buildings, respectively). The buildings are mostly characterized by vertical structures with