The Integrated Project LESSLOSS (Risk Mitigation for Earthquakes and Landslides), partially funded by the European Commission within the 6th Framework Programme, started on September 2004 and was concluded in August 2007. Activities were carried out by 46 European partners, with a total budget of 9.4 ME. The Project was divided into 11 Sub-Projects. This paper describes the activities performed in the framework of Sub-Project 6 (Development and Manufacturing of Energy Dissipation Devices and Seismic Isolators), which was coordinated by ENEA and whose partnership included two manufacturers of antiseismic devices (ALGA, Milan, Italy and MAURER SHO¨NE, Munich, Germany) and two consulting and construction companies (STAP, Lisbon, Portugal and VINCI, Paris-Rueil, France). Aim of Sub-Project 6 was the development and validation of two innovative antiseismic devices (a low stiffness isolator and an electroinductive damper), the improvement of the performances of a slider with curved surface and the evaluation of benefits and limits of isolation systems based on steel hysteretic dissipaters coupled with flat sliders. The Low Stiffness Isolator (LSI) was developed by ALGA; it is a natural rubber seismic isolator particularly addressed to light structures like family houses. The Electroinductive Damper (DECS), developed by ALGA, is an energy dissipater based on the interaction of a diamagnetic material, like aluminium, with an electric field generated by permanent magnets. The Sliding Isolation Pendulum (SIP) developed by MAURER is an improved curved surface slider, capable of withstanding high weights for long periods without creep effects and high velocity deformations without damages due to friction. Finally, several types of Steel Hysteretic (SH) elements of different geometries and materials have been analyzed and tested in order of evaluating the benefits and the limits of such devices, with particular regard to the re-centering capabilities. All the abovementioned devices have been tested on the ENEA shaking table of the Casaccia labs (near Rome), with a suitable mock-up capable of providing a 300 kN force on the devices in the acceleration and frequency ranges of interest, using several natural and artificial acceleration time histories purposely developed by ENEA. The paper describes the main features of the devices, the numerical activity aimed at the optimization of their behavior and the results of the four shaking table campaigns carried out on each device.

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