PSI - Issue 44

Stefano Bracchi et al. / Procedia Structural Integrity 44 (2023) 394–401 Stefano Bracchi et al. / Structural Integrity Procedia 00 (2022) 000 – 000

400

7

KL3-A-LOW-2

KL3-A-LOW-1

30

30

25

25

20

20

15

15

10 Frequency

10 Frequency

5

5

0

0

0

0.2

0.4

0.6

0.8

0

0.2

0.4

0.6

0.8

1

1

a g [g]

a g [g]

KL3-B-UPP-1

KL3-B-UPP-2

100

100

80

80

60

60

40

40

Frequency

Frequency

20

20

0

0

0

0.2

0.4

0.6

0.8

1

0

0.2

0.4

0.6

0.8

1

a g [g]

a g [g]

Fig. 4. Distributions of acceleration capacity corresponding to ULS obtained from analyses at KL3-A/B-LOW/UPP-1/2.

(a)

(b)

(c)

Fig. 5. Partial safety factors in case of bad (a), average (b) and good (c) masonry quality.

5. Conclusions This paper applies the seismic assessment procedure proposed by the draft of the new EC8 for existing URM buildings and based on nonlinear static analysis with an equivalent-frame model. The aim is to study the reduction of uncertainties in the results of the assessment when increasing the knowledge of the building. Furthermore, the results of the performed analyses are used to calibrate values of the partial safety factors accounting for the achieved knowledge, to be applied to the displacement capacity of the entire building. A single case study clay masonry building is analyzed assuming different knowledge levels and considering the variability of material properties. For each realization of sampled material properties, displacement capacity and acceleration corresponding to the attainment of