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Pile group program for full material modeling and progressive failure.
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  • Abstract:
    Strain wedge (SW) model formulation has been used, in previous work, to evaluate the response of a single pile or a group of piles (including its

    pile cap) in layered soils to lateral loading. The SW model approach provides appropriate prediction for the behavior of an isolated pile and pile

    group under lateral static loading in layered soil (sand and/or clay). The SW model analysis covers the entire range of soil strain or pile deflection

    that may be encountered in practice. The method allows development of p-y curves for the single pile based on soil-pile interaction by considering

    the effect of both soil and pile properties (i.e. pile size, shape, bending stiffness, and pile head fixity condition) on the nature of the p-y curve.

    This study has extended the capability of the SW model in order to predict the response of a laterally loaded isolated pile and pile group

    considering the nonlinear behavior of pile material (steel and/or concrete) and its effect on the soil pile-interaction. The incorporation of the

    nonlinear behavior of pile material has a significant influence on the lateral response of the pile/shaft and its ultimate capacity. The reduction in pile

    lateral resistance due to degradation in the pile bending stiffness affects the nature of the accompanying p-y curves, and the distribution of lateral

    deflections and bending moment along the pile. Contrary to the traditional Matlock-Reese p-y curve that does not account to the variations in the

    pile bending stiffness, the modulus of subgrade reaction (i.e. the p-y curve) assessed based on the SW model is a function of the pile bending

    stiffness. In addition, the ultimate value of soil-pile reaction on the p-y curve is governed by either the flow around failure of soil or the plastic hinge

    formation in the pile.

    The SW model analysis for a pile group has been modified in this study to assess the p-y curves for an individual pile in a pile group. The

    technique presented is more realistic and evaluates the variations in the stress and strain (i.e. Young’s modulus) in the soil around the pile in

    question due to the interference with the neighboring piles in a pile group in a mobilized fashion. The nonlinear behavior of pile material is also

    incorporated in the SW model analysis for a pile group.

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