Abstract: A sliding pendulum seismic isolator (1) comprises a lower sliding element (2) provided with a concave surface (2a) facing upwards, an upper sliding element (3) provided with a concave surface (3a) facing downwards, a first intermediate element (4) and a second intermediate element (5), said intermediate elements (4, 5) being each provided with a convex sliding surface (4a, 5a) suitable to allow the sliding of the first and second intermediate elements (4, 5) on the concave surfaces (2a, 3a) of said lower and upper sliding elements (2, 3) respectively. The first intermediate element (4) has a convex spherical surface (4b) opposed to its convex sliding surface (4a), and the second intermediate element (5) has a flat surface (5b) opposed to its convex sliding surface (5a). The convex spherical surface (4b) and the flat surface (5b) are in contact with each other and are suitable to allow a relative rotation substantially without sliding between the intermediate elements (4, 5).

Abstract: A tuned mass damper comprises a mass (1) restrained to a structure (2) through supporting means (3) suitable to allow a pendulum motion of said mass (1) when said structure (2) is subject to an external force, as well as damping means suitable for absorbing a portion of the kinetic energy of the moving mass (1). The supporting means (3) comprise at least one bearing (3) provided with a concave cylindrical sliding surface (3a) and the damping means are made as a coating of a controlled friction material of said sliding surface (3a).

Abstract: A sliding pendulum seismic isolator (1) comprises a lower sliding element (2) provided with a concave surface (2a) facing upwards, an upper sliding element (3) provided with a concave surface (3a) facing downwards, a first intermediate element (4) and a second intermediate element (5), said intermediate elements (4, 5) being each provided with a convex sliding surface (4a, 5a) suitable to allow the sliding of the first and second intermediate elements (4, 5) on the concave surfaces (2a, 3a) of said lower and upper sliding elements (2, 3) respectively. The first intermediate element (4) has a convex spherical surface (4b) opposed to its convex sliding surface (4a), and the second intermediate element (5) has a flat surface (5b) opposed to its convex sliding surface (5a). The convex spherical surface (4b) and the flat surface (5b) are in contact with each other and are suitable to allow a relative rotation substantially without sliding between the intermediate elements (4, 5).