Figure 14.
The comparison presents two soil-structure systems, one equipped with resonators and one without, subjected to El Centro, Parkfield, and Kalamata earthquake motions. Time-history records, frequency spectra, and frequency-response functions are displayed for measurement locations A 4, S 3, and S 4. Curves representing configurations with and without resonators are compared across the frequency range on the x-axis. The frequency-response results show reduced peak amplitudes and altered resonance behaviour when resonators are present, demonstrating vibration mitigation effects under different seismic excitations.Beneficial role of seismic resonant metamaterials. Comparison of centrifuge models with (magenta) and without (grey) unit cells, subjected to identical deconvoluted seismic excitations at the base. Fourier amplitude spectra near the free field (top left, A4); and horizontal acceleration FRF magnitudes from the base (S3) to the top (S4) of the structure (top-right). The response of the structure is significantly reduced at its resonant frequency of 145 Hz, which aligns with the resonant frequency of the unit cells