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Presentation
Multi-Modal Synthesis and Variable Modulus Effects in Resonant Column Tests by Random Excitations
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
  • Jeramy C. Ashlock, Iowa State University, Ames, IA
  • Ronald Y. S. Pak, University of Colorado at Boulder, Boulder, CO
Location
San Diego, California
Session Start Date
5-24-2010
Session End Date
5-29-2010
Abstract

To extend current measurement and data synthesis techniques for resonant column testing, random vibration transfer functions measured using a modified 6 inch (152.4 mm) diameter Drnevich free-free resonant column device are evaluated against viscoelastic theories of homogeneous and heterogeneous soil models. By means of the transfer function approach, it is found that the first four resonant peaks of the soil column response can be captured experimentally with some instrumental adaptations. By calibration against theoretical transfer functions, the ability to characterize the modulus and damping properties of the soil samples over a broad range of frequencies is demonstrated. As a generalization of the analytical theory for resonant column tests to a number of practical applications, the sensitivity of the experimental procedure to the specimen’s vertical material heterogeneity is examined for a linear variation in shear modulus. The feasibility of applying the experimental and analytical techniques to investigations of the frequency-dependence of damping properties is demonstrated. Calibration of theoretical models against measured resonant column soil behavior over a wide range of frequencies is anticipated to lead to more accurate material characterization across the spectrum of frequencies encountered in seismic and foundation vibration applications.

Department(s)
Civil, Architectural and Environmental Engineering
Appears In
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Meeting Name
Fifth Conference
Publisher
Missouri University of Science and Technology
Publication Date
5-24-2010
Document Version
Final Version
Rights
© 2010 Missouri University of Science and Technology, All rights reserved.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Citation Information
Jeramy C. Ashlock and Ronald Y. S. Pak. "Multi-Modal Synthesis and Variable Modulus Effects in Resonant Column Tests by Random Excitations" (2010)
Available at: http://works.bepress.com/jeramy_ashlock/19/