What does ISAAC technology consist of?

ISAAC technology is represented by active control systems of the seismic response. Designed for buildings of any size, ISAAC systems reduce the oscillations caused by the earthquake through the delivery of stabilizing forces generated by the movement, appropriately calculated, of moving masses. The implementation times and the invasiveness of the intervention are extremely reduced.

What does it mean that ISAAC systems are an active technology for seismic protection?

The ISAAC systems constitute an active control system that exerts forces on the building according to instructions received from a central computer; the latter constantly detects the accelerations experienced by the structure thanks to the sensor system e processes them through a control algorithm. In the event of an earthquake, the system starts up autonomously, avoiding damage to the building.

How does ISAAC technology work?

The machines are installed on the roof of the building (or its last floor horizontally) to obtain the maximum improvement of the structural performance of the building in the event of an earthquake. After installing the machines and connecting them to the motion sensors and the central control computer, the system becomes operational. In the event of a seismic event, the central computer detects the movement through the sensors and, thanks to the control algorithms, defines the movement and the force delivered to the building by each installed machine, so as to minimize the movement of the structure and maximize the dissipation of energy. introduced by the earthquake.

Depending on the size and number of floors of the building, the number of machines to be installed will be defined to obtain the desired seismic improvement. This allows to obtain performance increases in all the reference limit states for the building (SLO, SLD, SLV, SLC).

How are ISAAC systems anchored to the floor?

If the roof slab cannot bear the vertical load of the devices, and in any case to ensure a correct distribution of the horizontal forces on the vertical structural elements (such as walls or columns), it is recommended to design a small metal support and load distribution structure. .

What are the benefits of using active technologies for the end user?

The advantages deriving from the adoption of ISAAC systems for the end customer are:

  • Reduction of the invasiveness of the seismic improvement intervention.
  • Reduction of intervention times on the structure.
  • No downtime of the building as the systems are installed on the roof of the building, intervening only from the outside and not internally.
  • The greater the extension and performance to be guaranteed to the building, the higher the savings in the total cost of the intervention compared to the use of traditional reinforcement techniques.
Are ISAAC systems applicable in all seismic areas?

Yes, the systems are applicable in all seismic zones. Obviously, by changing the reference site and the expected seismic hazard, it is necessary to vary the number of devices installed according to the risk class to be achieved.

How do ISAAC technologies behave towards jolting seismic waves?

The AMDs proposed by ISAAC consist of longitudinal guides along which the mobile mass can oscillate horizontally. For this reason, the systems are able to counteract the effects on the structure of only the transverse waves that propagate in the ground. The shock waves, unlike the transverse ones, produce much less effects on buildings and are almost always negligible for the purposes of safety checks on structural elements. Only in some structural types (bridges, spans of great span, structures with instability) these types of waves produce significant seismic stresses and must be taken into account in the project, as also the Technical Regulations for Construction establishes.

Are ISAAC systems TMD?

No, TMDs (Tuned Mass Damper) are passive tuned mass devices. ISAAC systems are, on the other hand, an active control system (AMD, Active Mass Damper).