Evaluating Nonlinear Soil Behavior Using the Resonant Column

by 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.

Subject Headings: Soil properties | Nonlinear response | Resonance | Columns | Soil analysis | Equations of motion | Soft soils | Soil stress

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