Research on the Seismic Isolation Performance of Independent Periodic Foundations
Solid-state physics has revealed that periodic structures exhibit unique attenuation domain characteristics,where elastic waves within the attenuation frequency range cannot propagate through periodic structures.This principle can be applied to seismic isolation in civil engineering.Taking a four-story frame structure as an example,this paper employed numerical analysis to explore the isola-tion effect of an independent layered periodic foundation composed of rubber and concrete.The main influencing factors considered included the type and amplitude of seismic motion,rubber layer thick-ness,number of layers,and elastic modulus.Comparative analysis showed that the isolation effect of independent periodic foundations on high-frequency seismic waves was significantly stronger than on low-frequency seismic waves.As the amplitude of seismic waves increased,the isolation performance of the periodic foundation gradually decreased.Material parameters played a decisive role in the isola-tion performance,with structural stiffness decreasing as the thickness and number of rubber layers in-creased,and increasing with a higher rubber elastic modulus.The maximum attenuation in structural acceleration due to periodic foundations reached up to 53.2%.The research results can provide valu-able insights for the practical application of layered periodic foundations.
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