GERSRROResources and Equipments The horizontal qualification catapulte for protection structure impacts Display the main menu

The horizontal qualification catapulte for protection structure impacts

The car crash test appliance located in IFSTTAR Bron site, based on an hydraulic high capacity catapulte, is used for simulating rockfall impacts against works. This appliance allows real size studies, under dynamic pressure of horizontal impact that represents on site conditions, the behavior of different types of rockfall merlons, or other protection appliances or improvement of structure and building resilience (fondations, protection cushion,…).

The test consists in the horizontal projection against the tested work of a very rigid impactor with the same size than a rock. The maximum impact speed is about 120 km/h for a maximum projected mass of 2 tons, which corresponds to a maximum impact energy of about 1,100 kJ. For instance, this capacity allows to simulate the horizontal impact of a rock of about 1m3 at 100 km/h against the studied work.

The appliance has two test platforms:

  • A platform on the outside of the catapulte building where tested works can be built at 1:1 scale, as on this photo, a reinforced soil merlon with mineral face.
  • An inside platform is equipped with a choc reaction body in order to study the impact behavior of protection structure elements.

The laboratory of instrumentation, measures and metrology of RRO section is located near these 2 platforms. It is equipped with more than 100 sensors (efforts, accelerations, pressures, moves, temperature), fast acquisition systems adapted to impact studies, fast numeric cameras (1000 pictures per second and more) and HMI lighting systems for fast sessions.

The RRO laboratory has also unique appliances, adapted to geotechnical measurements in natural sites, such as the new Very Large Stripe radar (2015) that can detect micro moves on a work or natural site.