Issue 62

D. Wang, Frattura ed Integrità Strutturale, 62 (2022) 364-384; DOI: 10.3221/IGF-ESIS.62.26

Peak stress (MPa) Compressive Tensile

Grade

Peak strain Ultimate stress (MPa) Ultimate strain Elastic modulus (MPa)

3236

C30

28.72

2.87

0.0022

5.74

0.01

Table 9: Mechanical parameters of concrete.

Rebar grade Yield strength (MPa) Ultimate strain Elastic modulus (GPa) HRB400 445.50 0.01 200

Table 10: Mechanical parameters of rebars.

Compressive strength (MPa)

Shear strength (MPa)

Elastic modulus (MPa)

Shear modulus (MPa)

Bulk density (kN/m 3 )

2.02

0.55

1873

1089

6.87

Table 11: Mechanical parameters of the infill wall.

Ground motion selection and amplitude modulation. Due to the strong uncertainty of ground motions, the input ground motions of incremental dynamic analysis (IDA) must be reasonable. Following the selection principle for ground motion records in FEMA P695 [20], a total of 20 ground motion records were selected, including both far field and nearfield ground motions. Figs. 11 and 12 show the response spectra and mean response spectra of the two types of ground motions, respectively. The ground motion intensity measure (IM) was characterized by peak ground acceleration (PGA). The amplitude was modulated by the equal step principle. To explore the seismic performance of the infill wall, the amplitude of ground motions was gradually increased to 1.0g with a fixed step size of 0.05g.

Figure 11: Response spectra and mean response spectra of far field ground motions.

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