Abstract
The present study focuses on impedance functions at the head of single pile foundations that support bridges and viaducts. It is predicted that slippage and separation occur at the interface between soil and the pile foundations when subjected to strong motions. Therefore, it is desirable to know the effect of slippage and separation on the impedance functions. This study investigates the characteristics of the impedance functions by means of analytical approach based on a three-dimensional wave propagation theory, including the influence of inertial and kinematic interactions. The present study gives physical understanding of the effect of slippage and separation upon the impedance functions.
