Evaluating the interaction of soil-pile system to earthquake ground motions is an important stepin the seismic design of piles. Three Dimensional Finite Element Models have been developed by anumber of researchers. But these models are computationally expensive, complicated and not readilyused in design offices. In this study, a beam on nonlinear Winkler foundation (BNWF) approachconsisting simple nonlinear springs, dashpots and pipe elements is used to account for nonlinearity ofsoil-pile relative movement, energy dissipation through radiation damping of soil and material damping ofpile. The p-y curves within the frame of two dimensional Winkler foundation approach is widely used indesign offices to calibrate soil springs where p is the unit soil reaction and y is the pile deflection. In thisstudy, an attempt is made to make use of p-y curves proposed by American Petroleum Institute toestimate the lateral response of single flexible pile that is embedded in saturated sand. An effective stressbased ground response analysis is performed to predict input motions to soil springs at various depths ofsoil. Performance of the BNWF model being compared with centrifuge test results is shown to be aninexpensive procedure and compatible with readily available structural analysis software, ABAQUS forprediction of dynamic response of pile foundations in design offices.
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