Locally resonant metamaterials utilizing dynamic directional amplification: An application for seismic mitigation

Locally resonant metamaterials (LRMs), with unit-cells exhibiting local resonance, present extraordinary wave propagation properties as a result of their spatial periodicity. However, these structures certain limitations when wide bandgaps are sought, such the need heavy resonating masses. In this paper, simple dynamic directional amplification (DDA) mechanism is proposed means to artificially increase inertia mass. The DDA realized by imposing kinematic constraints model's degrees freedom (DoFs), hence increased coupling horizontal and vertical motion reference two-dimensional (2D) mass-in-mass lattice. A discrete element lattice model based on mass, stiffness, damping elements, used establish dispersion behavior frequency response, while results indicate broader significant improvements compared LRM. At last, preliminary design DDA-metabarrier presented proof concept, showcasing potential application seismic mitigation measure.