Design and evaluation of dual-resonant aggregates metaconcrete

Abstract

Metaconcrete is a newly manmade concrete where traditional aggregates are partially replaced by resonant aggregates. The metaconcrete slab can attenuate vibration in the specific frequency bandgap which are created by the locally resonant aggregates. To enhance the attenuation performance of metaconcrete slab, a dual-resonant aggregate was designed and embedded into the metaconcrete slab. Firstly, a mass-in-(massin-mass) analytical model is used to predict the bandgap characteristics of dual-resonant aggregates metaconcrete. Then, eigenfrequency investigation is conducted to acquire the dispersion curve of the periodic unit cell by using finite element software COMSOL Multiphysics. The effects of the mass and stiffness ratios parameters on the characteristics of bandgap are studied. The frequency responses of the dual-resonant aggregates metaconcrete reveal that the dual-resonant aggregates metaconcrete slab can acquire vibration wave mitigation in two designed frequency bands. The results offer a base for the optimal design of the metaconcrete slab for structural protections resist vibration loading.

Meta-Material Layout for the Blast Protection of Above-Ground Steel Pipes

“…The influence of the design parameters [42] and the effect of an enhanced coating layer [43] on the band-gap formulation and the response of the meta-concrete were described. More recent expressions of meta-concrete are found in [44], where the performance of a meta-concrete slab having embedded dual-resonant aggregate is evaluated, and in [45], where the response of meta-concrete panels subjected to an explosive load is studied. Another type of meta-materials concept for the same scope is a meta-sandwich panel, which was a previously proved idea for energy absorption [46] and blast protection [47,48], but is now examined and extended under the prism of the meta-materials theory.…”