Abstract
An analytical method for determining the dynamic stiffness and damping of piles in layered media, including the influence of separation of pile from the soil, is presented. The method is based on the theory of elastic wave propagation. Practically, during seismic forces exciting horizontally the pile is always partially separated from the soil around it at some depth from the surface of the earth at any instant. This physical phenomenon should be considered, so that the mixed boundary problem is constructed and then solved mathematically. The dynamic stiffness and damping of the pile obtained by the method given, is significantly less than that obtained by the existing methods in which the bonding of the pile to the soil were assumed. The calculated results based on this proposed method were compared with experiments, both results were in good agreement.
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