They protect buildings, bridges, flyovers, or any other facility, changing their reaction to the seismic action or other dynamic actions (for example wind). Most seismic devices are used within the innovative approach to seismic engineering, to change the seismic reaction of a structure by seismic isolation and/or energy dissipation. Namely: • ISOLATORS: they limit the acceleration transferred to the structure and reduce inertial stress by increasing the oscillation period. • DAMPERS: they dissipate part of the energy transferred to the structure according to their constitution, based on which they are divided into two large families, speed-dependent devices and displacement-dependent devices. On the other hand, FIXED RESTRAINT DEVICES are traditionally used in the traditional approach to seismic engineering, to transfer horizontal stress. TYPES: Seismic isolators Speed-dependent devices Displacement-dependent devices Fixed restraint devices

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