Mitigation of seismic waves: Metabarriers and metafoundations bench tested

Colombi, Andrea; Zaccherini, Rachele; Aguzzi, Giulia; Palermo, Antonio; Chatzi, Eleni

doi:10.1016/j.jsv.2020.115537

Cited by 47 publications

(24 citation statements)

References 52 publications

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“…New generations of numerical codes with the necessary capabilities including these effects (e.g. Colombi et al, 2020) will allow a more realistic design of scenarios that will help to mitigate the WT generated seismic noise.…”

Section: Discussionmentioning

confidence: 99%

Reduction of windturbine generated seismic noise with structural measures

Abreu¹,

Peter

Thomas³

2022

Preprint

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Abstract. Reducing wind turbine noise recorded at seismological stations promises to lower the conflict between renewable energy producers and seismologists. Seismic noise generated by the movement of wind turbines has been shown to travel large distances, affecting seismological stations used for seismic monitoring and/or the detection of seismic events. In this study, we use advanced 3D numerical techniques to study the possibility of using structural changes in the ground on the wave-path between the wind turbine and the seismic station in order to reduce or mitigate the noise generated by the wind turbine. Testing a range of structural changes around the foundation of the wind turbine, such as open and filled cavities, we show that we are able to considerably reduce the seismic noise recorded by placing empty circular trenches approx. 10 meters away from the wind turbines. We show the expected effects of filling the trenches with water. In addition, we study how relatively simple topographic elevations influence the propagation of the seismic energy generated by wind turbines and find that topography does help to reduce wind turbine induced seismic noise.

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Section: Discussionmentioning

confidence: 99%

Reduction of windturbine generated seismic noise with structural measures

Abreu¹,

Peter

Thomas³

2022

Preprint

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“…The most interesting property for the development of seismic metamaterials is the chance to exploit the frequency bandgap in which propagation of seismic wave is attenuated [2]. From this starting point a lot of searches in earthquake engineering started and proposed new approach in seismic protection: seismic cloaks and metabarriers as large-scale protection system of large built areas (and ground volume) and metafoundations, as improvement of seismic protection for the single building by including metamaterial design in the foundation structure [3][4][5][6][7][8][9]. The main evidence in all the applications is the low frequency working range (0.1-20 Hz), because both earthquakes frequency content and natural frequencies of most of the building in civil engineering are low.…”

Section: Seismic Metamaterialsmentioning

confidence: 99%

Metafoundation as a New Approach for Seismic Isolation of Buildings

Fiore¹,

Magisano²,

Finocchio³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Metamaterials for seismic protection are engineered to filter the low frequency component of seismic waves. In this study, we investigate the performance of a metastructure focusing on the improvement that the concept design of metamaterials can bring in the field of seismic isolation. The metastructure is realized as composite foundation built as a stack of concrete plates having internal resonant elements. The feasibility of the composite foundation is investigated by performing simulations in which at the base of each column of the building a composite metastructure replaces elastomeric isolator. Dynamic linear analyses are set for concrete multi-story frame buildings by using spectrum-compatible accelerograms for the horizontal components of the ground motion. The main result is the achievement of a reduction in the total displacement of the upper structure with respect a classical base isolation system. This work is a step forward in the understanding of the properties and performance of composite foundations as innovative base isolation system.

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“…In addition to light weight [3,4], negative Poisson's ratio [5], heat dissipation [6], and high-energy absorption [7] materials, there exist metamaterials that comprise unconventional vibrational characteristics [8,9]. These mechanical metamaterials are, nowadays, well-known for their capacity to attenuate [10,11] and trap [12,13] elastic waves over certain frequency bands, referred to as bandgaps. The design of metamaterials equipped with wide bandgaps and good isolation characteristics within the generated stop-bands offers benefits for various applications, including wave filtering [14], waveguiding [15,16],…”

Section: Introductionmentioning

confidence: 99%

Stress-optimized inertial amplified metastructure with opposite chirality for vibration attenuation

Zaccherini¹,

Colombi²,

Palermo³

et al. 2021

Preprint

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In this work, we investigate the dynamics and attenuation properties of a one-dimensional inertial amplified lattice with opposite chirality. The unit cell of the structure consists of a hollow-square plate connected to a ring through arch-like ligaments. The peculiar geometry and orientation of the links allow for coupling the axial and the torsional motion of the lattice, thus amplifying the inertia of the system. We develop both simplified analytical and numerical models of the building block to derive the complex dispersion relation of the infinite lattice. The structure supports a frequency-tailorable attenuation zone, whose lower bound is controlled by the second coupled axial-torsional mode. Laboratory measurements of the transmission spectrum on a 3D printed sample match very well with the analytical and numerical predictions, confirming the wide-band filtering properties of this lattice. We complete our investigation by developing and solving a constrained optimization model to obtain the optimized geometric parameters of the unit cell that minimize the bandgap opening frequency and, at the same time, fulfill structural requirements. In particular, the internal stresses induced by the self-weight of the structure are kept to a low by virtue of the employed design, with the aim to prevent plastic deformations and failure. The inertial amplification mechanism, proposed and investigated in this work, offers an efficient variant for the efficient design of materials and structures for vibration mitigation and shock protection.

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Mitigation of seismic waves: Metabarriers and metafoundations bench tested

Cited by 47 publications

References 52 publications

Reduction of windturbine generated seismic noise with structural measures

Reduction of windturbine generated seismic noise with structural measures

Metafoundation as a New Approach for Seismic Isolation of Buildings

Stress-optimized inertial amplified metastructure with opposite chirality for vibration attenuation

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