Effect of sample torsional stiffness on resonant column test results
Effect of sample torsional stiffness on resonant column test results
A number of resonant column tests were conducted in torsion on aluminium cylindrical bars. By changing the length to diameter ratio of these specimens, the resonant frequency was varied between 52 and 332 Hz. The values of the shear wave velocity (VS) and damping ratio (D) determined from these tests were found to remain acceptable up to a resonant frequency of about 175 Hz. Thereafter, with an increase in the torsional stiffness of the specimen, there was a significant decrease in VS of up to 32.2%, corresponding to a resonant frequency of 332 Hz, and a considerable increase in the damping was noticed. An apparent increase in the mass polar moment of inertia of the driving mechanism was also observed at a greater resonant frequency. The study reveals that, even for a stiff specimen, it is possible using the resonant column tests to accurately determine the dynamic properties of the specimen, provided that the length to diameter ratio of the specimen is increased so that the resonant frequency remains smaller than 175 Hz.
damping, dynamic testing, resonant column test, resonant frequency, shear modulus
221-230
Kumar, Jyant
c70d5995-3239-4de7-8ff1-44cf50fa4b2e
Clayton, C.R.I.
8397d691-b35b-4d3f-a6d8-40678f233869
February 2007
Kumar, Jyant
c70d5995-3239-4de7-8ff1-44cf50fa4b2e
Clayton, C.R.I.
8397d691-b35b-4d3f-a6d8-40678f233869
Kumar, Jyant and Clayton, C.R.I.
(2007)
Effect of sample torsional stiffness on resonant column test results.
Canadian Geotechnical Journal, 44 (2), .
(doi:10.1139/T06-099).
Abstract
A number of resonant column tests were conducted in torsion on aluminium cylindrical bars. By changing the length to diameter ratio of these specimens, the resonant frequency was varied between 52 and 332 Hz. The values of the shear wave velocity (VS) and damping ratio (D) determined from these tests were found to remain acceptable up to a resonant frequency of about 175 Hz. Thereafter, with an increase in the torsional stiffness of the specimen, there was a significant decrease in VS of up to 32.2%, corresponding to a resonant frequency of 332 Hz, and a considerable increase in the damping was noticed. An apparent increase in the mass polar moment of inertia of the driving mechanism was also observed at a greater resonant frequency. The study reveals that, even for a stiff specimen, it is possible using the resonant column tests to accurately determine the dynamic properties of the specimen, provided that the length to diameter ratio of the specimen is increased so that the resonant frequency remains smaller than 175 Hz.
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Published date: February 2007
Keywords:
damping, dynamic testing, resonant column test, resonant frequency, shear modulus
Identifiers
Local EPrints ID: 53177
URI: http://eprints.soton.ac.uk/id/eprint/53177
ISSN: 0008-3674
PURE UUID: 2276e0fe-e22f-4d44-b29c-d600310266f8
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Date deposited: 21 Jul 2008
Last modified: 16 Mar 2024 03:12
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Author:
Jyant Kumar
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