Design and Performance Analysis of Resonant Seismic Surface Wave Barriers

Abstract:

A periodic structure has band-gap characteristics so that the vibrations or waves in the band-gap frequency range cannot propagate in the structure. Based on this concept， an embedded seismic barrier for manipulating Rayleigh surface waves is designed. The influence of the design parameters of the seismic barrier and the constraint conditions between the resonant element and the supporting foundation on the elastic wave dispersion curve and the formation of the bandgaps of seismic surface wave is studied. The results indicate that the embedded seismic metamaterial barrier can form a surface wave band gap in the low frequency region and realize an effective attenuation domain. The constraint conditions between the resonant element and the supporting foundation can significantly alter the band structure of the dispersion curve. Different constraint conditions can affect the formation of the surface wave bandgaps， and even cause the disappearance of the surface wave bandgaps. Thus， in the process of barrier design and implementation， factors， such as friction， that affect the relative movement between the resonant element and the supporting foundation should be considered and rationally designed.

Key words:seismic metamaterial;wave barrier;surface wave;bandgap;earthquake