Abstract
A finite element method based program has been developed to perform the static nonlinear analysis of pile group with six different configurations subjected to lateral loads. The pile has been assumed to remain elastic all the time whereas the soil has been assumed to undergo plastic yielding following von Mises yield criterion. The formulation of elasto-plastic analysis following von Mises yield criterion has been explained. The effect of Drucker-Prager and Mohr Coulomb yield criteria on the response of pile group is also investigated. The whole analysis is based on incremental load application. The external load is applied in small increments and the stresses are initially computed assuming elastic constitutive relation. Significant effect of soil nonlinearity is observed at smaller pile spacing which reduces with increase in spacing.
Highlights
Nonlinear p-y analysis is the most widely used method for design of laterally loaded piles due to its simplicity; the successful application of a p-y method depends upon the availability of detailed information on a spatial distribution of soil properties which are key factors in the design of laterally loaded deep foundation
The finite element method provides a more precise tool that is capable of modelling soil continuity, soil nonlinearity, pile-soil interface behaviour, and 3-D boundary conditions
A finite element program has been developed to perform the static nonlinear analysis of pile group with six different configurations subjected to lateral loads
Summary
Nonlinear p-y analysis is the most widely used method for design of laterally loaded piles due to its simplicity; the successful application of a p-y method depends upon the availability of detailed information on a spatial distribution of soil properties which are key factors in the design of laterally loaded deep foundation. The finite element method provides a more precise tool that is capable of modelling soil continuity, soil nonlinearity, pile-soil interface behaviour, and 3-D boundary conditions. It is more rigorous in its analytical methodology than any other existing methods. Najjar and Zaman [4] [5] studied the effects of loading sequence and soil nonlinearity on the deformation behaviour of a pile group using a nonlinear 3-D finite element technique. The soil elements are assumed to undergo plastic yielding according to the von Mises yield criterion This model has been selected because it is suitable for analyzing the behaviour of purely cohesive soils under undrained condition. The formulation and implementation of additional features required for incorporating nonlinear behaviour are presented in this paper
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