PSI - Issue 44

Bruno Dal Lago et al. / Procedia Structural Integrity 44 (2023) 1068–1075 Dal Lago et al. / Structural Integrity Procedia 00 (2022) 000–000

1073

6

Whilst the deformed shapes of the main modes of the 24-storey building clearly suggest a global deformation trend, those of the 6-storey building are associated with local out-of-plane deformations of vertical unit walls. This is reflected in the dynamic properties of the buildings, resumed in Fig. 9, where it can be observed that there are several modes detected by the analysis having similar periods, which are associated to a very low increase of participating mass. This makes the attainment of a large cumulated mass relatively difficult, especially for squatter buildings, unless even hundreds of modes are considered in the analysis.

Σ %Mx Welded plate Σ %Mx Dowelled plate

Σ %Mx Diamond-loop mortar joint

Σ %Mz Welded plate Σ %Mz Dowelled plate

Σ %Mz Diamond-loop mortar joint

100

0.5

Dowelled plate Diamond-loop mortar joint Welded plate

80

0.4

60

0.3

0.2

40

Period [s]

0.1

20

0.0

0

0 20 40 60 80 100 120 140 160 180 200 Cumulated mass partecipation [%] No. of Mode

0 20 40 60 80 100 120 140 160 180 200

No. of Mode

(a)

100

1.2

1.0

80

0.8

60

0.6

40

0.4 Period [s]

20

0.2

0.0

0 0 20 40 60 80 100 120 140 160 180 200 Cumulated mass partecipation [%] No. of Mode

0 20 40 60 80 100 120 140 160 180 200

No. of Mode

(b)

2.0

100

1.6

80

1.2

60

0.8

40

Period [s]

0.4

20

0.0

0

Cumulated mass partecipation [%]

0

10

20

30

40

50

0

10

20

30

40

50

(c)

No. of Mode

No. of Mode

100

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

80

60

40

Period [s]

20

0

Cumulated mass partecipation [%]

0

10

20

30

40

50

0

10

20

30

40

50

No. of Mode

(d)

No. of Mode

Fig. 9. Dynamic properties in terms of period and cumulated participating mass for the case study structures having: (a) 6 storeys; (b) 12 storeys; (c) 18 storeys; (d) 24 storeys.