PSI - Issue 44

Carolina Bazzani et al. / Procedia Structural Integrity 44 (2023) 171–178 Carolina Bazzani et al. / Structural Integrity Procedia 00 (2022) 000–000

177

7

(a)

Level of damage (EMS98): D5 Collapse D4 Very serious D3 Substantial D2 Moderate D1 Negligible or slight D0 No damage

EXPANSION SECTOR 4

0.61

(b) Damage distribution of historic sector

1%

7% 24%

41%

28%

0%

100%

(c) Damage distribution of expansion sector 4

HISTORIC SECTOR 3.86

1%

36%

53%

10%

0%

100%

Fig. 9. Average damage map (a) and damage distribution of historic sector 1 (b) and expansion sector 4 (c)

4.3. Comparison with AeDES forms

After the moderate seismic event that struck the Mugello area on December 9, 2019 (Mw=4.5 and hypocentral depth 7.3 km), and focusing on the historic sector 1 of Barberino di Mugello, where the damage was the greatest, as well as the intensity recorded, the 1st level survey forms (AeDES) were analyzed. From the forms data, it was possible to observe that in the historic sector 26% of the buildings were found to be unusable. Applying Equation 4, the unusable buildings would result in an estimated percentage equal to 26% within the historic sector 1. Estimating this percentage using the damage distribution derived from the average damage formulation proposed by Lagomarsino & Giovinazzi (2006) and Bernardini et al. (2007a, b), results in 11% of unusable buildings in the historic sector, while it results in 23% of unusable buildings using the average damage formulation proposed in the updated Macroseismic Method by Lagomarsino et al. (2021), (Fig. 10).

50%

40%

26%

26%

30%

23%

20%

15%

11%

10%

0%

Lagomarsino et al. (2007)

Menichini et al. (2022)

Lagomarsino et al. (2021)

Zuccaro et al. (2020)

AeDES forms

Fig. 10. Percentage of unusable buildings according to AeDES forms, Menichini et al. (2022), Lagomarsino et al. (2021), Lagomarsino et al. (2007) and Zuccaro et al. (2020).