The axial dynamic response of a single pile in clay is examined within the framework of a Winkler-type approach. Experimental data for the variation of soil shear modulus and hysteretic damping with the amplitude of shear strain and the soil`plasticity' index are curve-®tted and utilized in simulating in a realistic way the non-linearity of the surrounding soil arising from the stresses induced by the pile. An equivalent radially-inhomogeneous but linearlyhysteretic continuum is established, and thè springs' and`dashpots' of the dynamic Winkler model are obtained at each depth by solving analytically the pertinent plane-strain (in z) and axisymmetric (in r) elastodynamic problem. Slippage at the pile±soil interface is also taken into consideration in a simple approximate way. Analytical results are presented to demonstrate the practical signi®cance of soil non-linearity, soil`plasticity' index and interface slippage in the dynamic stiffness and damping of the pile.
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