Curved surface sliders are being used more and more in the seismic isolation of buildings. *ey are preferred not only because of\ntheir lower cost with respect to elastomeric isolators but also of their technical characteristics, such as the fact that the value of the\nperiod of vibration is independent of the mass and the automatic coincidence between the gravity mass center of the superstructure\nand the stiffness center of the isolation system. In this paper, these features are analysed with reference to simple\nstructures, pointing out the possibility of rotations of the superstructure and the loss of contact in some devices. Finally, the\nimportance of the static friction is also emphasized showing the experimental seismic response of an isolation system under a lowenergy\nearthquake. For all these reasons, the use of nonlinear analysis, revised and detailed in this paper, is advisable for the\nisolation system made of curved surface sliders.
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