sliders with isteretic dampers - Antiseismic devices - Alga PND/PNUD
The Algasism PND-PNUD device is a combination of a POT bearing to carry the vertical load and a hysteretic elasto-plastic dissipator capable of controlling the horizontal force level and to dissipate energy due to the earthquake.
The Algasism PND-PNUD devices fulfil the following requirements:
Transmit the vertical loads due to permanent and accidental effects;
Allow the rotation between the structure and the infrastructures up to 0.01 rad
Allow, with very low reaction the parasite reaction due to structure length variations due to creep, shrinkage and thermal effects
Transmit the horizontal service load with small movements remaining with elastic response behaviour
In the case of significant earthquakes limit the reaction force and dissipate energy by hysteretic behaviour
Guarantee a stable response characteristic during a dynamic response with no cycle deterioration
The PND-PNUD devices assure the following advantages:
- Very simple maintenance equal to the standard POT bearing because all the structural parts made by steel
- Possibility of controlling the horizontal force transmitted from the superstructure to the substructure
- Reaction characteristic very simple (bilinear), stable with no temperature dependence
- After a catastrophic earthquake only the elements that dissipate energy by plasticization must be replaced with no damage to other components of the structure
