PSI - Issue 81

Mykhailo Hud et al. / Procedia Structural Integrity 81 (2026) 372–376

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Scenario 3

Scenario 3a

Scenario 3b

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

Frequencies, Hz

1

2

3

4

5

6

7

8

9

10

11

12

13

Modes

Fig. 4 Natural frequencies for scenarios 3, 3a, and 3b.

Group 3 demonstrates (Fig.4) an increase in medium-range natural frequencies. Variant 3a has the highest frequencies, indicating the stiffest structural system among all models. Conversely, variant 3b is characterised by minimal frame stiffness and increased susceptibility to deformation under dynamic loads.

Scenario 1

Scenario 1a

Scenario 1b

Scenario 2

Scenario 2a

Scenario 2b

Scenario 3 Scenario 3b Fig. 5 Deformations of the building frame at the fifth mode of natural vibrations for the corresponding scenarios Scenario 3a

As demonstrated in Figure 5, the spatial deformations of the building frame in the fifth mode of natural vibration are presented for all material combinations. It is evident that models incorporating steel and reinforced concrete demonstrate reduced deformations, concomitant with increased stiffness. Conversely, the models constructed from wood exhibited augmented flexibility and deformability.