PSI - Issue 78

Francesca Mattei et al. / Procedia Structural Integrity 78 (2026) 2007–2014

2012

number. As it is clear from Table 4 it is assumed that all the buildings in the area have (average) four floors, therefore V h = 0.88 and I h = 1.

Table 4. Height index. Vh Ih > 0.500 1 ≤ 0.500 0

The urban vulnerability index I uv and the specialist type index I spt depend on the use and they are equal to 0 for urbanized and residential areas as historical center of Cosenza. The seismic classification index I sc takes into account the seismic zone in which the area is located: in this case, since Cosenza falls within zone 1 according to the OPCM Classification (n. 3274, 2003) and the framework of the the method does not allow for this to be taken into account, the first option with an index of 1 was chosen (Table 5).

Table 5. Seismic classification index. Seismic zone

Isc

Seismic zone 2 with classification after 2003 Seismic zone 2 with classification before 2003 Seismic zone 3 or 4

1

0

Therefore, the Vulnerability Index Iv, permits the definition of Seismic Vulnerability Class V. In this case Iv ≥ 4 , therefore V = 4 (Table 6).

Table 6. Seismic Vulnerability Class. Seismic Vulnerability Iv High Iv ≥ 4

4 3 2 1

Medium-High Medium-Low

Iv = 3 Iv = 2 Iv ≤ 1

Low

The Exposure Class E depends on the exposure index I e , that is the sum of the density index, taking into account the number of buildings and the resident population consisting of 5000 residents, and the destination index, equal to 0 for residential areas (from ISTAT). In this case, Ie =3 and E = 3 (Table 7).

Table 7. Seismic exposure class. Seismic Exposure

Ie

E

High

Ie ≥ 4 Ie = 3 Ie = 2 Ie ≤ 1

4 3 2

Medium-High Medium-Low

Low

1

Finally, The Risk Class R is determined according to the Indicator of Risk IR = H + V + E. For historical center of Cosenza, R is equal to 4, corresponding to a high seismic risk (Table 8).

Table 8. Risk class Seismic Risk

IR

R