Non Linear Analysis of Group Of Piles

Krishnamoorthy, Agrahara and Rao, N B S and Anil, D S (2003) Non Linear Analysis of Group Of Piles. Indian Geotechnical Journal , 33 (4). pp. 375-395.

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The ultimate load carrying capacity and settlement behaviour of the pile is essential of the safe and economical design of pile foundations. There are several methods available to obtain the ultimate load carrying capacity and settlement behaviour of pile foundations. With the availability of high speed large storage computers, numerical modeling of the foundation soil system and the analysis of the same will be more appropriate to determine the load settlement behaviour of a pile resting on soil. Nowadays finite element method is widely used for the anlysis of soil structure interaction problems due to its versatility. In most of the previous works carried out using finite element method, the behaviour of soil is assumed as elastic or elasto-plastic. However the load settlement behaviour of soil is generally nonlinear form the beginning and it depends on stress path, dilatancy and initial stress conditions. Hence some form of nonlinear relationship which simulates the behaviour of soil must be used to represent the soil. Also, the basic problem of a pile group is three dimensional in nature. In the present work, the pile resting on soil is analysied using three dimensional finite element method. A hypoelasticity constitutive model proposed by Yin et al. (1989) is used to model the behaviour of soil. The model considers the important soil properties like nonlinearity, dilatancy and coupled behaviour. The stress-strain behaviour of pile is assumed as linear and the pile is modeled using two nodded line element with one degree of freedom (displacement invertical direction) at each node. The relative slip between soil and pile is represented by an interface element. The element is having two double nodes with one vertical displacement as degree of freedom at each node. The stiffness matrix for the element is developed based on the concept proposed by Goddman et al. (1968).

Item Type: Article
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 09 Jul 2011 09:09
Last Modified: 09 Jul 2011 09:09

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