Evaluating Nonlinear Soil Behavior Using the Resonant Columnby Gary Bianchini,
Document Type: Proceeding Paper
Part of: Advances in the Art of Testing Soils Under Cyclic Conditions
An analysis is presented that attempts to match a mathematical model to the nonlinear behavior obtained from the resonant column test. This model consists of an oscillator with a restoring force represented by a hysteretic dashpot in parallel with a nonlinear, nonconservative spring. For steady state response the spring is characterized by hysteretic loops following the Masing's criterion using a Ramberg-Osgood equation for the backbone curve. The equation of motion is analyzed using the Krylov-Bogoliubov-Mitropolsky (KBM) perturbation method. Mathematical relations between the resonant frequency, amplitude and excitation force are developed. The value of the parameters in the model are obtained from a large number of tests on clay samples.
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