PSI - Issue 78

Giulia Giuliani et al. / Procedia Structural Integrity 78 (2026) 952–959

955

a) b) Fig. 3. Horizontal (a) and vertical (b) response spectra of the records for R JB =5km.

Table 1. Near Fault ground motion record for R JB = 0km.

Record Number

Sequence Number

File Name

Station

Mw

RJB

Average

Pulse Like

✓ ✓ ✓ ✓ ✓ ✓ ✓

1 2 3 4 5 6 7

26

EMSC-20100903_0000044 GDLC 7.1

1.1 0.7 0.9 1.3

0.36 0.31 0.27 0.30 0.31 0.25 0.23

1087

USGS-usp0003afe

5051 2402 E070 E050

6.6 6.6 6.5 6.5

864

TK-1992-0002

1057 1055

USGS-usp00013ee USGS-usp00013ee

1 0 0

365

INT-UT19990920_174715 B133

7.58

42

EMSC-20100903_0000044 ROLC 7.1

Table 2. Near Fault ground motion record for R JB = 5km.

Record Number

Sequence Number

File Name

Station

Mw

RJB

Average

Pulse Like

✓ ✓ ✓ ✓

1 2 3 4 5 6 7

27

EMSC-20100903_0000044 HORC 7.1

7.2 7.6 4.2 3.3 7.8

0.28 0.15 0.25 0.24 0.27 0.22 0.24

1105 1054

USGS-usp00040t8 USGS-usp00013ee

58065 E040

6.9 6.5

110 689 404 393

EMSC-20140824_0000036 1765 INT-UT19990920_174715 B109 INT-UT19990920_174715 B067 INT-UT19990920_174715 B075

6.07 7.58 7.58 7.58

0 0

✓

3. Case Study Structures and Isolation Design This study investigates the seismic performance of three-dimensional base-isolated reinforced concrete (RC) buildings with 3 and 9 stories, chosen as representative case studies. Both structures feature a regular rectangular plan measuring 30 m × 15 m, with uniform inter-storey heights of 3.2 m and span lengths of 5 m in both directions (Fig. 4). The 3-story building is composed of beams and rectangular columns measuring 30 cm × 40 cm, and square columns of 40 cm × 40 cm. For the 9-story configuration, member dimensions vary along the height to reflect typical design practice: beams and rectangular columns are 30 cm × 60 cm for the bottom three stories, 30 cm × 50 cm for the middle three, and 30 cm × 40 cm for the upper three stories. Square columns follow a similar tapering: 50 cm × 50 cm, 45 cm × 45 cm, and 40 cm × 40 cm from base to top, respectively. Each structure is analysed at four fault distances (0, 5, 15, and 30 km), resulting in a total of eight distinct configurations.