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Effects of Vibration Cycles on Shear Modulus and Damping of Sand Using Resonant Column Tests

Cherian, Achu Catherine and Kumar, Jyant (2016) Effects of Vibration Cycles on Shear Modulus and Damping of Sand Using Resonant Column Tests. In: JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 142 (12).

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Official URL: http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.00015...

Abstract

Resonant column tests, corresponding to a given input voltage of the drive mechanism, were conducted in torsional mode to examine the effect of vibration cycles on shear modulus (G) and damping (D) of dry sand with shear strain amplitude in a range of 0.0005-0.05%. Two different relative densities, approximately 61 and 85%, and effective confining pressures, 300 and 500kPa, were used. The specimens were subjected to a number of vibration cycles ranging from 1,000 to 50,000. The shear modulus and damping ratio, before and after the application of vibration cycles, were determined for several input voltages. An induction of the vibration cycles leads to a continuous increase in shear strain, which causes (1)a decrease in the shear modulus and (2)an increase in the damping ratio. This effect becomes especially more prominent for lower values of relative densities and confining pressures. The modulus reduction and damping curves remained the same after applying vibration cycles.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ASCE-AMER SOC CIVIL ENGINEERS, 1801 ALEXANDER BELL DR, RESTON, VA 20191-4400 USA
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Depositing User: Id for Latest eprints
Date Deposited: 04 Jan 2017 04:46
Last Modified: 04 Jan 2017 04:46
URI: http://eprints.iisc.ac.in/id/eprint/55703

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