Download Sébastien Guenneau (Institut Fresnel, UMR CNRS 7249 à Aix

Colloque soutenu par DMC, PAMO et DCPhys:
Métamatériaux sismiques
Sébastien Guenneau (Institut Fresnel, UMR CNRS 7249 à Aix-Marseille Université),
[email protected]
Stéphane Brûlé (Agence Rhône Alpes de Ménard, Nozay), [email protected]
Using analogies between transformational optics to control surface electromagnetic waves
propagating at structured metal-dielectric interfaces and transformational elastodynamics to control
Rayleigh waves propagating at the surface structured soils, it has been proposed
(http://www.cnrs.fr/insis/recherche/faits-marquants/2010/cape-invisibilite-seisme.htm) to detour
Rayleigh waves around a building by concentric layers of soil of varying density and Young modulus,
so that vulnerable buildings could someday be shielded from damaging earthquakes by surrounding
them with seismic invisibility cloaks. A first prototype of such a seismic cloak has been tested
experimentally in 2012 (http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.133901) by
the soil dynamic team of Stéphane Brûlé at the civil engineering Ménard company. In principle, the
concept of seismic cloak could be extended to create protective barriers that divert earthquake
energy away from sensitive facilities say power plants, with columns of concrete buried in soil, or
even above the soil, notably in alluvium basin where seismic site effects can be observed. A number
of research groups in France (e.g. researchers at ISTerre in Grenoble), Europe (notably in Italy,
Greece, Romania, Swiss and United-Kingdom) and indeed worldwide (China, Japan, Turkey and USA)
have since then started to work on large scale mechanical materials. The present symposium will
offer a unique occasion to exchange ideas and viewpoints on this emerging topic which lies at the
interface between optics, mechanics, geophysics and civil engineering.
 8h30 : Stéphane Brûlé (Inst. Fresnel, Marseille): Enjeux des métamatériaux sismiques pour le
Génie Civil
 8h45 :Federico Bosia (LOMC Le Havre): Métamatériaux mécaniques à grande échelle pour
applications sismiques
 9h00 :Richard Craster (Imperial Coll. London, UK): Ultra-low broad frequency stop-bands in
structured elastic media
 9h15 :Bogdan Ungureanu (TU Iasi, Roumanie): Exemples de metamateriaux sismiques
existants
 9h30 :Andrea Colombi (Imperial Coll. London, UK): Scaling metamaterials to the seismic
wavelength: what can be done and what cannot
 9h45 :Allessandro Marzani (Bologne, Italie): A multi-mass metabarrier as seismic
metamaterial for Rayleigh waves
 10h00 : Vasilis Dertimanis (ETH Zurich Suisse): Seismic Metamaterials: Technical
Requirements and Practical Challenges
 10h15 : Roberto Zivieri (Messine, Italie): Modeling and design of non-linear seismic
metamaterials