Antiseismic devices

Seismic protection of structures

The seismic protection of the structures is one of the most attractive goals of the structural engineers in order to save lives and minimize damages to structures in case of earthquakes of high intensity.

The absence of damage is of primary importance for some types of structures, such as:

• structures which house high risk components and materials (nuclear facilities, some chemical plants, etc.);
• important bridges and viaducts;
• important public buildings (hospitals, emergency control centres, energy and communication distribution centres, etc.);
• structures which are important for the national defence;
• structures which house costly components and electronic equipment;
• museums and historic and artistic monuments.

In order to protect the structures Alga has developed suitable devices such as:

Isolators

• HDRB - High Damping Rubber Bearings
• LRB - Lead Rubber Bearings
• APS - Sliding pendulum system
• PND/PNUD - Hysteretic Isolators with pot bearings
• CSD/CSUD - Hysteretic isolators with spherical bearing

Dampers

• EP - Hysteretic Dampers
• ED - Elastic Dampers
• VD - Viscous Dampers
• VED - Visco-Elastic Dampers
• STU - Shock Transmission Units
• DECS - Electro Inductive Dampers

ALGA S.p.A engineers design the devices and can cooperate with the structural designers in order to provide the best seismic protection systems by also performing linear and non linear dynamic analyses by suitable finite element software by numerical modelling of the structures and the devices.