PSI - Issue 64

Rosario Montuori et al. / Procedia Structural Integrity 64 (2024) 841–848 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 4. Structural details of the horizontal bracing system.

Fig. 5. Foundation plan.

Table 1. Mechanical properties of the structural elements. Structural Elements

Experimental Values = 327.30 MPa ; = 451.50 MPa = 640 MPa ; = 800 MPa = 20 MPa ; = 25 MPa = 434.70 MPa

Steel beams and columns Steel bolts and nuts Concrete (RC walls) Steel bars (RC walls)

3. Seismic vulnerability assessment 3.1. Structural modelling The structural vulnerability has been evaluated according to the provisions of the Italian code. The main parameters of the seismic hazard with reference to the Limit States (LS) are shown in Table 2. The numerical model has been developed in SAP2000 where the steel members have been defined as beam column elements, while 4-node shell elements have been used for the concrete walls. The rigid diaphragms have been adopted due to the presence of the concrete slab with the bracing systems. Moreover, the structural model has been considered fixed at the base by considering the foundation properties. Fig. 6a shows the structural model of the building implemented in SAP2000, while Fig. 6b reports the first three modal shapes derived by the linear dynamic analysis.

Table 2. Main parameters of the site seismicity Limit State [ ] [ ] [ − ] ∗ [ ] SLO 60 0.065 2.330 0.317 SLD 101 0.085 2.328 0.328 SLV 949 0.210 2.433 0.340 SLC 1950 0.260 2.531 0.341