IMPROVED FRICTION SEISMIC ISOLATOR OF THE MOBILE PENDULUM TYPE

摘要

An improved friction seismic isolator (1) of the mobile pendulum type comprising a lower plate (2) which is arranged close to a foundation structure; an upper plate (3) which is arranged above the lower plate (2) along a longitudinal axis (Y) and contributes to supporting an elevation structure to dissipate the kinetic energy transmitted to the elevation structure by a natural phenomenon or by a human- caused event and provided with a high release of total energy, a mobile dissipation pendulum (4) arranged in simple support against the lower plate (2) and the upper plate (3) between which it is interposed in such a way as to swing freely on an inner surface (2a, 3a) of the lower plate (2) and the upper plate (3) according to one or more random side directions, orthogonal to the longitudinal axis (Y), alternately between an equilibrium position, taken in absence of the natural phenomenon or the human-caused event, in which the mobile dissipation pendulum (4), the lower plate (2) and the upper plate (3) are substantially coaxial to each other, and a plurality of instability positions, taken while the natural phenomenon or the human-caused event is in progress, in which the mobile dissipation pendulum (4), the lower plate (2) and the upper plate (3) are offset from each other, to dissipate the kinetic energy of the natural phenomenon or the human-caused event, transmitted to the elevation structure. In particular, the mobile pendulum (4) has, at least one of the two side faces (4a, 4b) axially opposite each other along the aforesaid longitudinal axis (Y), a plurality of surface recesses (5) facing towards the outside, inside which sliding inserts (6) made of high-friction coefficient plastic material are housed.