Journal
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
Volume 173, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijengsci.2022.103655
Keywords
Rayleigh bandgap; Seismic barrier; Surface wave; Periodic structures; Bloch-Floquet theory
Categories
Funding
- DST [SRG/2019/001238, MoE/STARS-1/345]
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This paper studies the use of periodically arranged seismic barriers to mitigate seismic surface waves in layered soils. The research finds that by increasing the surface stiffness of the existing ground, the barriers effectively reduce the amplitude of surface seismic waves, thus mitigating damage from seismic events.
This paper studies periodically arranged seismic barriers consisting of finite and infinite lattices to mitigate seismic surface waves in layered soils. Using Bloch-Flouquet theory, three different configurations of periodic barriers are examined. Rayleigh, Love, and shear surface waves are quantitatively identified using three conceptions: depth of energy, sagittal polarization ratio, and sound cone. The performed analyses suggest that if barriers increase the surface stiffness of existing ground, Rayleigh modes will be located above the sound cone, thus providing energy dissipating channels through bulk modes. Numerical modeling of finite barriers in time and frequency domains validates the concept of Rayleigh modes' energy dissipation to bulk modes. The results indicate that the designed barriers effectively reduce the amplitude of surface seismic waves, thus mitigating damage from seismic events.
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