Combined loading of RC pile groups in clay accounting for N–M interaction

Psychari, Antonia; Anastasopoulos, Ioannis

doi:10.1016/j.soildyn.2022.107490

Cited by 10 publications

(2 citation statements)

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“…In the last decades, focusing on the case of centred vertical loads, the beneficial role of the pile-raft-soil interaction in influencing the bearing capacity of piled raft foundations (not negligible in case of "large" piled raft foundations with pile lengths comparable with raft width, as defined in [5] has been extensively studied by many authors ( [6], [7], [8], [9], [10], [11], [12], [13]). Only recently, both experimental and numerical results highlighted the non-negligible role of the raft in piled foundations also under general loading conditions ( [14], [15], [16], [17], [18], [19], [20], [21], [22], [23]). However, until now, rapid and simplified design approaches considering the pile-raft-soil coupling are missing.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study and theoretical interpretation of the role of rafts in piled foundations on cohesive soils

Corigliano,

Flessati,

Marveggio

et al. 2024

Preprint

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Numerous European infrastructures have reached their intended lifespan and require reassessment according to the recent design standards, nowadays accounting seismic actions for. The current standard verification approach for piled bridge foundations still relies on oversimplifying assumptions, potentially leading to excessive over safety and to unsustainable design solutions. With the aim of improving the design process, without introducing any additional modelling complexity, in this paper the mechanical behaviour of a real piled foundation located on homogeneous clay layer have been numerically studied. Non-linear finite elements numerical analyses have been performed by assuming the soil to behave under undrained conditions. The role of pile-raft-soil coupling, typically neglected in the common design practice, is discussed and numerical results are employed to derive the interaction domain of the piled raft system. By interpreting the failure mechanisms and by using the limit equilibrium method, a simple analytical procedure is proposed to predict the interaction domain under general loading conditions, without performing any numerical analyses. The method is demonstrated to be suitable for pile lengths comparable with the raft major dimension. The procedure has been validated over different load combinations and design geometries.

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Section: Introductionmentioning

confidence: 99%

“…Fig 22 . Theoretical failure envelopes versus numerically obtained failure points for the pile configuration of Fig.21and for the case study configuration (Fig.1).…”

mentioning

confidence: 99%

Numerical study and theoretical interpretation of the role of rafts in piled foundations on cohesive soils

Corigliano,

Flessati,

Marveggio

et al. 2024

Preprint

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A Comparison Between Theoretical and Numerical Ultimate Failure Domains for Pile Groups

Potini

Conti

2023

Springer Series in Geomechanics and Geoengineering

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A strain-hardening macro-element model for pile groups under vertical–horizontal-moment loading

Iodice,

Iovino,

Di Laora

et al. 2024

Acta Geotech.

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Pile foundations supporting wind turbines, silos, elevated water tanks or bridge piers are frequently subjected to multi-component loads, which may lead to significant rotations and settlements compromising the safe operation of the structure. The prediction of these displacements is of major concern and can be easily carried out using force-resultants plasticity models, also referred to as ‘macro-elements’, stemming from the idea of describing the foundation behaviour by a single upscaled constitutive relationship between generalized forces and displacements. When properly formulated, they can reproduce key aspects of the mechanical response of the foundation at low computational cost as compared to numerical analysis. To this end, a new macro-element for pile groups formulated in the classical framework of strain-hardening elasto-plasticity is presented and discussed. The required model parameters can be calibrated by closed-form equations and additional few data of numerical and/or experimental nature. The proposed mathematical framework is finally validated against the results of centrifuge tests and 3D finite element analyses.

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Combined loading of RC pile groups in clay accounting for N–M interaction

Cited by 10 publications

References 50 publications

Numerical study and theoretical interpretation of the role of rafts in piled foundations on cohesive soils

Numerical study and theoretical interpretation of the role of rafts in piled foundations on cohesive soils

A Comparison Between Theoretical and Numerical Ultimate Failure Domains for Pile Groups

A strain-hardening macro-element model for pile groups under vertical–horizontal-moment loading

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