PSI - Issue 44

Devis Sonda et al. / Procedia Structural Integrity 44 (2023) 1188–1195 Sonda D., Pollini A.V. / Structural Integrity Procedia 00 (2022) 000 – 000

1192

5

4. Time history analyses Non-linear time history analyses have been performed on structural models with the purpose of evaluating and estimating the benefits of introduction of CWST Sismocell devices, compared to a structure with hinged connections, considering different scaling factors for each accelerogram. 4.1. Selection of the records The seismic input adopted for the non-linear dynamic analyses is a set of 7 spectrum-compatible ground acceleration time histories. The two different target spectrums considered for the selection of the time histories are the life safety limit state elastic response spectrum, defined by the Italian building code, respectively for the site of Carpi (MO) and Faenza (RA) in Italy. The spectrum for the site of Carpi (MO) has a return period of 712 years, corresponding, to a nominal life equal to 50 years and importance class III. The 7 accelerograms used in the analyses were selected from the NGA-West database developed by PEER, with a specific algorithm. The spectrum for the site of Faenza (RA) has a return period of 475 years, corresponding, to a nominal life equal to 50 years and importance class II. The 7 accelerograms used in the analyses were selected from the European Strong Motion Database (ESD) implemented in REXELweb (Sgobba et al. 2019). Ground type C with no topographic amplification effects is assumed for both sites. Main parameters of selected accelerograms are resumed in Table 2.

Table 2. Selected accelerograms main parameters of Carpi (MO) and Faenza (RA) Italian seismic sites. Name, Year [-] Station name [-] M w [-] PGA [m/s 2 ] Carpi (MO) Faenza (RA)

Carpi (MO)

Faenza (RA)

Carpi (MO)

Faenza (RA)

Chalfant Valley-01, 1986 Bishop – LADWP South St Chalfant Valley-01, 1986 Bishop – LADWP South St

Emilia, 2 nd shock, 2012 MIRH

5.77

6.0

1.270

2.65

Central Italy, 2016 Amatrice

5.77

6.0

0.926

3.68

Westmorland, 1981 Brawley Airport

Central Italy, 2016 Castel Sant’Angelo sul Nera Emilia, 1 st shock, 2012 Mirandola Emilia, 2 nd shock, 2012 Loc. Cortile – Carpi (MO) Northern Italy, 2012 Novi di Modena (MO)

5.90

6.5

1.660

2.88

Westmorland, 1981 Salton Sea Wildlife Refuge

5.90

6.1

1.729

2.57

Coyote Lake, 1979 Gilroy Array #3

5.74

6

2.242

4.36

San Salvador, 1986 National Geografical Inst

5.80

5.5

3.987

2.53

Coyote Lake, 1979 Gilroy Array #3

Central Italy, 2016 Spelonga

5.74

6.5

2.673

2.80

4.2. Non-linear analyses results Non-linear time history analyses have been performed on different structural models, at different level of seismic action intensity, using a scaling factor (SF) for each time history from 0 to 100%, with 10% steps of SF increase. Totally, seven different combinations of structural model, CWST device type and seismic site were considered, as shown in the following Table 3.