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Devices Dependent On Displacement NDL

RED – AIOS

What are these?

Displacement Dependent Devices with nonlinear behaviour (NDL) are metal retainers, which use the hysteretic properties of the material to dissipate energy. They consist of a series of steel elements designed to deform plastically under seismic action.
  • The RED type, made with shaped like crescent moon elements has a unidirectional configuration, so it acts in a single horizontal direction.
  • The AIOS type is a combination of confined elastomeric disc bearings and hysteretic steel elements. The ‘C’ shaped steel elements acting as dissipators, may be placed in just one horizontal direction or in both directions, thus providing the device with unidirectional or bidirectional behaviour.
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