The paper deals with the problem of the bearing capacity of pile groups under vertical eccen-tric load. Widespread practice is to consider the achievement of the single pile axial capacity on the outermost pile as the ultimate limit state of the pile group. However this approach ne-glects the ductility of the foundation system and may be thereby over-conservative. With the aim of proposing an alternative and more rational approach, a novel formulation for interac-tion diagrams based on theorems of limit analysis is presented and discussed. The methodolo-gy is applicable to the general case of groups of unevenly distributed, dissimilar piles. Piles connections to the pile cap are modelled as either plastic hinges or rigid-plastic internal fixi-ties. An application example to a slender structure is also provided, showing that the proposed approach can lead to significant advantages over the traditional design.

Bearing Capacity of Pile Groups under vertical eccentric load

DI LAORA, RAFFAELE
Investigation
;
DE SANCTIS, Luca
Investigation
;
Aversa Stefano
Supervision
2019

Abstract

The paper deals with the problem of the bearing capacity of pile groups under vertical eccen-tric load. Widespread practice is to consider the achievement of the single pile axial capacity on the outermost pile as the ultimate limit state of the pile group. However this approach ne-glects the ductility of the foundation system and may be thereby over-conservative. With the aim of proposing an alternative and more rational approach, a novel formulation for interac-tion diagrams based on theorems of limit analysis is presented and discussed. The methodolo-gy is applicable to the general case of groups of unevenly distributed, dissimilar piles. Piles connections to the pile cap are modelled as either plastic hinges or rigid-plastic internal fixi-ties. An application example to a slender structure is also provided, showing that the proposed approach can lead to significant advantages over the traditional design.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11367/65955
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