Issue 54

F. Brandão et alii, Frattura ed Integrità Strutturale, 54 (2020) 66-87; DOI: 10.3221/IGF-ESIS.54.05

Seismic excitation For the seismic analyses, records of three real earthquakes (obtained from [34]), shown in Tab. 2, and a non-stationary artificial earthquake (resonant earthquake), generated by the Kanai-Tajimi Spectrum [35-36] and an envelope function adapted from [37] are used as seismic excitation.

Record

Earthquake name

Country

Year

Station

M (M w ) (1) D (km) (2)

PGA (g) (3)

1

Loma Prieta

EUA

1989

Santa Cruz-USCS

7.0

17.5

0.441

2

L'Aquila

ITA

2009

L'Aquila-V.A-Centro Valle

6.3

8.8

0.661

3

Canterbury

NZL

2010

Kaiapoi N. School

7.0

5.0

0.343

Note: (1) M, Magnitude of the earthquake; (2) D, depth of the earthquake; (3) PGA, Peak Ground Acceleration.

Table 2: Characteristics of the real earthquakes utilized. For each real earthquake in Tab. 2, only an accelerogram of the horizontal component with the largest PGA was used. Each earthquake has a different length of time and PGA, therefore, it was decided to use only the most relevant 20s of each record and a common PGA for all, which was 0.4g. In Fig. 4 is shown the accelerogram and PSD of each record.

Figure 4: Accelerogram and PSD of the three real earthquakes.

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