Rayleigh seismic wave control by seismic metabarrier with low frequency band gaps: From lab-scale experiments to its engineering applications

This manuscript proposes a novel metabarrier system for safeguarding engineering structures. The system comprises periodically arranged unit cells around the target structures, which feature steel piles anchored to concrete foundations. First, its low-frequency bandgap characteristics and seismic wave attenuation efficiency were validated through laboratory-scale experimental tests. Subsequently, its seismic control performance was evaluated in a real-world engineering scenario, using a case study of a two-story, three-span subway station. The study systematically examines how varying pile lengths influence dispersion relations and seismic control mechanisms of the metabarrier. Key findings reveal that increased pile length induces hybrid mode formation in the dispersion relations, which narrows the bandgap width and reduces Rayleigh wave attenuation efficiency. The metabarrier primarily mitigates seismic threats through dual mechanisms: reflection and conversion of Rayleigh waves. The reflection and conversion processes are critically governed by both pile length and excitation frequency. Finally, dynamic analyses confirm substantial response reductions in structural deformation, acceleration and structural internal forces. © 2026 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.