The recent advance of seismic metamaterials has led to various concepts for the attenuation of seismic waves. A particularly promising type of material is the locally resonant metamaterial, which is capable of attenuating seismic waves at wave lengths much greater than the dimensions of its unit cells. Based on this concept, the so called Metafoundation has been design. It is able to protect a fuel storage tank from ground motions at various fluid levels. In order to show the effectiveness of the proposed design, the response of the Metafoundation is compared to the response of a tank on a traditional concrete foundation. The design process of conceiving the Metafoundation, optimizing it for a specific tank, and its seismic response are described herein. Furthermore, the response of a tank during a seismic event can cause severe damages to pipelines connected to the tank. This phenomenon can be of critical importance for the design of a seismic tank protection and must be treated with care. Since the coupled structure (tank+foundation+pipeline) exerts highly non-linear behavior, due to the complexity of the piping system, a laboratory experiment has been conducted. More precisely, a hybrid simulation that uses the Metafoundation and a tank as a numerical substructure (NS) and a piping system as a physical substructure (PS) was employed. In order to make the results relatable to the current state of the art, additional experiments were performed with concave spherical bearing devices (CSBs) as an isolation system in the NS. While the Metafoundation performed better than the CSB isolated structure for some records, a clear advantage could not be concluded. However, the Metafoundation offers a clear attenuation of tank stresses and may potentially mitigate also piping stresses when tuned to the right frequency in the future.

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