Site response analysis of liquefiable soil employing continuous wavelet transforms

Chavan, D and Sitharam, TG and Anbazhagan, P (2022) Site response analysis of liquefiable soil employing continuous wavelet transforms. In: Geotechnique Letters, 12 (1). pp. 1-11.

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Abstract

Propagation of the earthquake motion towards the ground surface alters both the acceleration and frequency content of the motion. Acceleration-time record and Fourier amplitude spectrum of the motion reveal changes in the acceleration and frequency content. However, Fourier amplitude spectrum fails to give frequency-time variation. Wavelet transforms overcome this difficulty. In the current study, site response analysis of a liquefiable soil domain has been investigated employing wavelet transforms. Three earthquake motions with distinct predominant frequencies are considered. It is revealed that the moment soil undergoes initial liquefaction, it causes a spike in the acceleration-time history. From the analysis, frequency of the spikes is found to be greater than the predominant frequency of the acceleration time history recorded at the ground surface. Interestingly, the spikes belong to the sharp tips of the shear stress-shear strain curve. Immediately after the spike, acceleration deamplification is observed. Post-liquefaction deamplification (filtering) of the frequency components is also observed. © 2021 ICE Publishing: all rights reserved.

Item Type:	Journal Article
Publication:	Geotechnique Letters
Publisher:	ICE Publishing
Additional Information:	The copyright for this article belongs to ICE Publishing
Keywords:	Acceleration; Earthquakes; Pore pressure; Shear strain; Shear stress; Soil liquefaction; Wavelet transforms, Acceleration-time history; Deamplification; Earthquake motion; Fourier amplitude spectra; Frequency contents; Ground surfaces; Liquefiable soil; Predominant frequency; Site response analysis; Wavelets transform, Soils, acceleration; earthquake; ground motion; liquefaction; pore pressure; response analysis; shear strain; shear stress; site effect; transform; wavelet analysis
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	07 Feb 2022 12:07
Last Modified:	07 Feb 2022 12:07
URI:	http://eprints.iisc.ac.in/id/eprint/71235

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