PSI - Issue 61

Adil Ziraoui et al. / Procedia Structural Integrity 61 (2024) 171–179 Adil Ziraoui et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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base buildings. These significant reductions in displacement are essentially attributable to the ability of leaded rubber isolators (LRBs) to dissipate seismic energy efficiently.

Fig. 7. Comparative graph of the maximum storey drift for the two structures

Fig. 8. Comparative graph of maximum base shear for the two structures

Figure 7 provides an overview of the evolution of inter-storey drift for 8-storey and 10-storey buildings. The results show a significant reduction in inter-storey drift when the isolated base approach is implemented. This reduction is particularly noteworthy when compared to the fixed-base buildings. In the case of the 8-storey reinforced concrete building, the maximum drift value is 0.34% in the X direction and 0.42% in the Y direction for a fixed-base building. If an insulator is placed at the base, the drift ratio is considerably reduced, to just 0.13% in the X direction and 0.17% in the Y direction, compared with the values observed in buildings with a fixed base. This means that there is an impressive reduction in drift, ranging from 50% to 60%, in the case of buildings benefiting from base isolation, compared with fixed-base buildings, for both 8-storey and 10-storey structures. This significant reduction in drift is convincing proof of the effectiveness of the base isolation method in limiting