I‑Pro 1 is a smart seismic protection active control system for existing buildings. It reduces the time and invasiveness of the intervention.
No, I‑Pro 1 is an active control system.
Instead, Tuned Mass Dampers (TMD) are passive mechanical devices.
I‑Pro 1 is installed on the building roof to improve its structural performance during an earthquake. After installing I‑Pro 1, and connecting it with sensors and the central control unit, it starts working. Depending on the size and the number of building floors, the number of devices to be installed to obtain the desired seismic improvement will adapt accordingly. This allows for improvements in all building limit states (SLO, SLD, SLV, SLC).
During an earthquake, the central unit records movement by sensors and thanks to the control algorithms, computes in realtime the forces needed to minimize structure oscillations and avoid a potential collapse.
I‑Pro 1 is an active control system that exerts forces on the building according to the commands defined by the central unit which records the structure movements thanks to motion sensors; that’s how I‑Pro 1 reduces the structure’s movement during an earthquake to help avoid collapse.
I‑Pro 1 is a standard product and does not require ad hoc design to be applied. It’s suitable for different building types, the only variable is the number of devices to be installed depending on the size in plan, the number of floors of the building and the seismic improvement desired.
Thanks to I‑Pro 1 time intervention and invasiveness are drastically reduced; this allows to reduce the logistical and economic discomfort’s for owners, who will not have to evacuate the building during the construction.
No, I‑Pro 1 is an active device moved by electro-hydraulic actuators operating with mineral oil.
The advantages deriving to I‑Pro 1 adoption to the end customer are:
- Invasiveness reduction of the seismic improvement intervention.
- Intervention reduction time.
- Interventions are only on the exterior of the building.
I‑Pro 1 carries out a weekly “self-check” to verify that the device’s performance has not decreased or degraded; so, if it’s necessary, it’s possible to schedule timely maintenance. This approach is unusable for a passive system, which can be verified with a quality test only, (on 2% up to 20% of the components produced in a batch of devices according to UNI EN 15129: 2018). This means that it’s possible to detect any faults during the replacement and the dismissing phases.
Therefore, the device’s performance and the maintenance needs can be constantly checked remotely. In any case, ordinary system’s maintenance of the system is scheduled.
The use and maintenance booklet and the technical files are delivered to the customer together which is a CE marked device; these documents explain activities and components necessary to carry out routine maintenance. The maintenance must be carried out by ISAAC certified technicians.
All this guarantees, compared to the use of passive interventions or simple local reinforcements, a h24 check of the product and its functioning, as well as a constant verification of seismic safety. All this guarantees maximum security to the owners and users of the properties.
How is the functionality of the device guaranteed over time? What happens if the earthquake occurs, for example, 30 years after installation?
There is a usefull mechanical engineering practice named FMEA risk analysis for identifying the Performance Levels and Safe Integrity Levels.
This analysis allows to identify any risks which a device is subject to, so as to identify a reliability index. If the defined securty level is not guaranteed, it’s possible to obtain it by mechanical, electrical and hydraulic redundancies.
I‑Pro 1 carries out a weekly self-check to guarantee that the device’s performance does not decline over time; this check allows to define rapid maintenance in case of notification. This means that even without scheduled ordinary maintenance, devices status can be checked remotely at any time.
For old buildings with unknowing characteristics could I‑Pro 1 lead to a more rapid structural collapse during an earthquake?
The control algorithms allows to optimize I‑Pro 1 performance in accordance to the structure and the seismic improvement desired; This means that an improvement result is always achievable.
A building simplified linear model obtained through structure dynamic field tests is sufficient to the analysis. Therefore if the project and the FEM model used by the design office in charge of seismic improvement, did not exactly reflect the behavior of the building, this would not create any problems for the correct functioning of the technology.
ISAAC will be able to perform non-linear dynamic simulations of the building subjected to an earthquake and simultaneously with the control forces produced by I‑Pro 1. It will thus be possible to verify the deviation dynamic parameters between the FEM model of the building and the parameters measured in site, as well as the reduction of the loads on the structural elements (moment, shear, compression loads, …).
Yes, I‑Pro 1 is certified with CE marking according to the Machinery Directive and SIL safety certificate (EN 61508).
Yes, I‑Pro 1 is suitable in all seismic areas. Considering this: by changing the application area, and consequently the elastic spectrum defined, it is necessary to install a number of greater or lesser devices according to the minimum risk class to be achieved.
If the roof slab cannot bear the devices vertical load, and to ensure a correct distribution of the horizontal forces on the pillars, we suggest to design a frame where devices are firmed and anchor them to the pillar heads.
I‑Pro 1 has been developed to be applied to reinforced concrete and steel buildings; no studies have yet been carried out for I‑pro 1 application to masonry structures.