Simplified Method and Parametric Sensitivity Analysis for Soil-Pile Dynamic Interaction under Lateral Seismic Loading

Abstract

The response of piles and their load carrying capacity depends on the soil-pile interaction. Pile foundations of different type of structure are often subjected to lateral loading induced by the environment acting such as wind, sea wave, and earthquakes. The lateral loads exerted at the pile head are basic factor that governs the response of single pile or pile groups. This chapter presents a simplified model based on beam on nonlinear dynamic Winkler foundation (BNDWF) for soil-pile dynamic interaction under lateral seismic loading. To develop the governing equation, the beam is discretized into a series of N-1 discrete beam elements with a total of N nodes. In element analysis, each beam element is considered individually as forces acting at the nodes, and it cause displacements and rotations of the nodes. The validity of the simplified model is calibrated by comparing the results with those of finite element method (FEM). In the FEM code, the system that consists of pile and surrounding soil is idealized as an assemblage of 3D finite elements. At the each node there are three translational degrees of freedom. The deformation of the pile, including bending, will be derived from these nodal translational displacements and element stresses.