COMPARISON OF DIFFERENT METHODS FOR KINEMATIC PILE MOMENT AT THE INTERFACE OF LAYERED SOIL PROFILE

Abstract

The aim of this paper is to compare different simplified methods used for evaluating steady state kinematic pile bending moments in floating piles at the interface of two soil layers of vastly different shear modului. Four commonly used methods are discussed in this paper which are proposed by Nikolaou et al.1, Nikolaou and Gazetas2, Mylonakis3, and Ahmad et al.4. These methods are based on Beam on Dynamic Winkler Formulation (BDWF). A BDWF code is developed to find kinematic pile bending moment at the interface of two-layer soil deposit. The parameters related to soil, pile, and excitation frequency are varied over wide range. The results of the BDWF are then compared with the simplified equations. The standard deviation and mean are worked out for all the four methods. It is found that the method proposed by Ahmad et al.4 gives the least standard deviation.