Chapter
Apr 26, 2012
Application of Random Vibration Techniques to Resonant Column Testing
Authors: Jeramy C. Ashlock [email protected] and Ronald Y. S. Pak [email protected]Author Affiliations
Publication: GeoFlorida 2010: Advances in Analysis, Modeling & Design
Abstract
A 152.4 mm (6 in) diameter resonant column device was modified to enable the direct measurement of torsional acceleration transfer functions of samples subjected to random excitation in the small-strain regime. Samples were tested over a wide range of confining pressures. By measuring the rotational acceleration of the end platens, the need to estimate the applied torque using a torque-current calibration factor for data reduction was eliminated, and issues such as back-emf, base fixity and eddy currents were bypassed. Preliminary calibration results illustrate that the first four peak frequencies and amplitudes can be readily employed for a calibration of modulus and damping characteristics over a wide frequency band, utilizing the continuous nature of the system rather than only the fundamental frequency of the specimen configuration.
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© 2010 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Assistant Professor, Dept. of CCEE, Iowa State University, 474 Town Engineer Bldg., Ames, IA 50011, USA. E-mail: [email protected]
Professor, Dept. of CEAE, University of Colorado, ECOT 423, Boulder, CO 80309-0428, USA. E-mail: [email protected]
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