Efficient numerical model for the computation of impedance functions of inclined pile groups in layered soils

Álamo, Guillermo M.; Martínez-Castro, Alejandro E.; Padrón, Luis A.; Aznárez, Juan J.; Gallego, Rafael; Maeso, Orlando

doi:10.1016/j.engstruct.2016.07.047

Cited by 46 publications

(34 citation statements)

References 38 publications

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“…With the intention of reducing the number of degrees of freedom needed to solve the soilfoundation problem, a second numerical model [8] is considered. The main simplification of this model with respect to the previous BEM-FEM one is the treatment of the foundation (pile/bucket) as a beam element.…”

Section: Integral Model With Soil-beam Interactionmentioning

confidence: 99%

“…For this reason, many models with different degrees of simplifying assumptions have been developed over the last years, see e.g. [6,7,8]. Particularly attractive are one-dimensional models, which are typically cheap to run.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this paper is to perform a comparative study between three foundation models (BEM-FEM model with soil-shell interaction [7], integral model with soil-beam interaction [8] and a Beam-on-Dynamic-Winkler-Foundation (BDWF) model [9]) for the evaluation of the seismic response of OWTs founded on deep (monopile and bucket) foundations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison Between Models for the Evaluation of the Seismic Response of Offshore Wind Turbines on Deep Foundations

Álamo¹,

Bordón²,

Hernández³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In this work, a comparative study between several numerical methodologies for the seismic analysis of offshore wind turbines on deep foundations (monobuckets or monopiles) is presented. Three formulations are compared within the scope of linear elasticity. First, a coupled Boundary Element -Finite Element (BEM-FEM) model is considered for obtaining the reference results. This methodology makes use of boundary elements to discretize the soil, while modelling the actual geometry of the hollow pile through shell finite elements. The second model corresponds to a formulation based on the integral expression of the reciprocity theorem in elastodynamics and the use of specific Green's functions for the layered half space for the modeling of soil, and the treatment of the pile as unidimensional beam elements. Finally, a Beam-on-Dynamic-Winkler-Foundation (BDWF) model is also considered as a commonly used simple tool for the analysis of deep foundations. The results are presented in terms of variables of interest for the design of offshore wind turbines. From the analyses, the applicability range of these methodologies can be established depending on the properties of the turbine-foundationsoil system.

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Section: Integral Model With Soil-beam Interactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison Between Models for the Evaluation of the Seismic Response of Offshore Wind Turbines on Deep Foundations

Álamo¹,

Bordón²,

Hernández³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

View full text Add to dashboard Cite

show abstract

“…As for soil‐foundation impedances, different models have been developed over the years to evaluate the dynamic stiffness of pile group foundations. Numerical methods, generally requiring high computational efforts, are preferred to solve such a fully coupled problem; in particular, approaches based on the Boundary Element Method (BEM), Finite Element Method (FEM), or mixed formulations are used . The latter is generally adopted by introducing different level of simplifications to avoid modelling the far‐field.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical methods, generally requiring high computational efforts, are preferred to solve such a fully coupled problem; in particular, approaches based on the Boundary Element Method (BEM), 9 Finite Element Method (FEM), or mixed formulations are used. [9][10][11][12] The latter is generally adopted by introducing different level of simplifications 10 to avoid modelling the far-field. However, from an engineering perspective, methods based on simplifying assumptions derived from physical remarks have received more attention.…”

Section: Introductionmentioning

confidence: 99%

A lumped parameter model for time‐domain inertial soil‐structure interaction analysis of structures on pile foundations

Carbonari

Morici

Dezi

et al. 2018

Earthq Engng Struct Dyn

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Summary The paper presents a lumped parameter model for the approximation of the frequency‐dependent dynamic stiffness of pile group foundations. The model can be implemented in commercial software to perform linear or nonlinear dynamic analyses of structures founded on piles taking into account the frequency‐dependent coupled roto‐translational, vertical, and torsional behaviour of the soil‐foundation system. Closed‐form formulas for estimating parameters of the model are proposed with reference to pile groups embedded in homogeneous soil deposits. These are calibrated with a nonlinear least square procedure, based on data provided by an extensive non‐dimensional parametric analysis performed with a model previously developed by the authors. Pile groups with square layout and different number of piles embedded in soft and stiff soils are considered. Formulas are overall well capable to reproduce parameters of the proposed lumped system that can be straightforwardly incorporated into inertial structural analyses to account for the dynamic behaviour of the soil‐foundation system. Some applications on typical bridge piers are finally presented to show examples of practical use of the proposed model. Results demonstrate the capability of the proposed lumped system as well as the formulas efficiency in approximating impedances of pile groups and the relevant effect on the response of the superstructure.

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3D analytical modeling of moving‐loading induced pile‐group behavior in stratified cross‐anisotropic poroelastic water‐saturated soils based on two stage theory

Yang,

Jia

2024

Num Anal Meth Geomechanics

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The aim of this paper is to propose a two‐stage theory‐based analytical method for the dynamic performance of pile groups in layered poroelastic saturated cross‐anisotropic soils induced by moving loadings. Among them, the free‐field vibrational analysis of saturated soils is performed by the analytical element‐layer approach (ALEA) and Fourier transformation. Based on the free‐field response, the boundary element (BE) solution for the soil resistance at the soil‐pile interface is derived utilizing the two‐stage theory. Simultaneously, the finite element (FE) solutions for the pile shaft resistance and deformation of pile groups are derived based on the Timoshenko beam theory. Finally, the FE‐BE coupled dynamic equation for deformations and internal loadings of the soil‐pile system is obtained. Thereafter, the reliability of the proposed method is validated by comparing with existing solutions and FE data from ABAQUS. Based on the derived solutions, a comprehensive parametric study is performed to examine the effects of loading amplitude, force speed, soft soil‐layer stiffness, soil anisotropy, and pile length on the dynamic responses of pile groups.

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Efficient numerical model for the computation of impedance functions of inclined pile groups in layered soils

Cited by 46 publications

References 38 publications

Comparison Between Models for the Evaluation of the Seismic Response of Offshore Wind Turbines on Deep Foundations

Comparison Between Models for the Evaluation of the Seismic Response of Offshore Wind Turbines on Deep Foundations

A lumped parameter model for time‐domain inertial soil‐structure interaction analysis of structures on pile foundations

3D analytical modeling of moving‐loading induced pile‐group behavior in stratified cross‐anisotropic poroelastic water‐saturated soils based on two stage theory

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