PSI - Issue 44

Domenico Magisano et al. / Procedia Structural Integrity 44 (2023) 456–463 Magisano et al. / Structural Integrity Procedia 00 (2022) 000–000

462

7

· 10 − 3

0 1 2 3 4 5

FULL

ROM

0 1

u / H

0 0 . 2 0 . 4 0 . 6 0 . 8 1 − 1

f loor

FULL

ROM

0

1

0 . 5

1 . 5

t / ∆ T

u / H

· 10 − 3

Time history for scale factor S F = 0 . 25

Maximum profile deformation for scale factor S F = 0 . 25

10 − 3

2 0 2 4 ·

0 1 2 3 4 5

FULL

ROM

FULL

ROM

u / H

0 0 . 2 0 . 4 0 . 6 0 . 8 1 − 4 −

f loor

− 3

− 2

− 1

0

t / ∆ T

u / H

· 10 − 3

Time history for scale factor S F = 1

Maximum profile deformation for scale factor S F = 1

0 0 . 2 0 . 4 0 . 6 0 . 8 1 − 2 0 2 4 · 10 − 2 t / ∆ T u / H FULL ROM Time history for scale factor S F = 4

0 1 2 3 4 5

FULL

ROM

f loor

0

1

2

3 · 10 − 2

u / H

Maximum profile deformation for scale factor S F = 4

Fig. 7: Mildly irregular frame: time history of the control point and peak profile deformation for di ff erent values of the scale factor.

0 1 2 3 4 5

0 1 , 000 2 , 000 3 , 000 0 1 2 3 4 5 T s ( kN ) FULL ROM

0 1 , 000 2 , 000 3 , 000 4 , 000 0 1 2 3 4 5 T s ( kN ) FULL ROM

f loor

f loor

f loor

FULL

ROM

0

500 1 , 000

T s ( kN )

S F = 0 . 25

S F = 1

S F = 4

Fig. 8: Mildly irregular frame: maximum story shear forces for di ff erent values of the scale factor.

plastic collapse mechanisms and single story mechanism obtained with static analysis for each direction of the seismic action. Results show accuracy and robustness of the reduced model and the importance of including the plastic modes when the seismic loading cause relevant excursions in the plastic range. This highlights the limitations of simplified approaches based on the hypothesis of shape conservation in nonlinear problems regardless of the building regularity. Readers are referred to Magisano et al. (2022) for more details.