PSI - Issue 44

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Marco Furinghetti et al. / Procedia Structural Integrity 44 (2023) 1490–1497 Marco Furinghetti / Structural Integrity Procedia 00 (2022) 000 – 000

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Fig. 6. Analysis of results: building base-shear response

Numerical non-linear time history analyses have returned the best results, since limited variations percentage value can be noted from both the single-event and the mean values, in comparison to the building strength. Nonetheless, also experimental results seem to suggest that the obtained response fairly represents the guessed designed target values, with a variation lower than 10% for the mean response, with maximum 20% for some single events (#2 and #5). It has to be noted that the superstructure has been modelled through a linear elastic numerical model and consequently the base shear could achieve value higher than the strength level of the capacity curve, which was instead returned by a non-linear model; in addition, generally standard codes worldwide allow a force reduction (behaviour) factor value equal to 1.5 for the superstructure of a seismically isolated system, and consequently a certain amount of plastic deformation can be achieved (NTC18). 6. Conclusions All the performed analyses and the presented results have shown the effective accuracy of the obtained mechanical properties, returned by the adopted fast design rule for Curved Surface Slider devices. Precisely the following conclusions can be drawn:  The adopted design rule seems to lead to reasonable definitions of both friction coefficient and equivalent radius of curvature for the implemented isolators, since displacement demands of the