Numerical Investigation of Large-Diameter Monopiles in Sands: Critical Review and Evaluation of Both API and Newly Proposed
            <i>p-y</i>
            Curves

Bouzid, Djillali Amar

doi:10.1061/(asce)gm.1943-5622.0001204

Cited by 30 publications

(6 citation statements)

References 41 publications

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“…Sorensen [15] the above-mentioned p-y curves were deemed no longer appropriate for this kind of foundations. A detailed critical review of the API method can be found in [8]. This situation prompted many researchers to suggest analytical p-y curves formulae in an attempt to improve the analysis by accounting for the monopile diameter and sometimes for monopile bending flexural rigidity.…”

Section: Silicamentioning

confidence: 99%

“…However, as this model has been developed on the basis of field testing investigations performed on small-diameter piles (D p =0.61 m) with an (L p ⁄D p ) ratio of 34.0 [6,7], it does not appear capable of reasonably predicting the lateral response of large-diameter monopiles supporting OWTs. For an in-depth review of the drawbacks of the API p-y model, the reader is referred to [8].…”

Section: Introductionmentioning

confidence: 99%

“…The main objective of this paper is to assess the performances of the currently used p-y models (API and DNV) and the enhanced p-y curves recently proposed to design monopiles under lateral loading. This is achieved by a comparative study between the results supplied by a computer program called WILDPOWER 1.0 [8] and those of the Finite Element (FE) analysis obtained using the commercial package ABAQUS.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of sand p–y curves by predicting both monopile lateral response and OWT natural frequency

Amel

Bouzid

Bhattacharya

et al. 2022

Studia Geotechnica Et Mechanica

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Extending the use of the p–y curves included in the regulation codes API and DNV to design large-diameter monopiles supporting offshore wind turbines (OWTs) was unsuccessful as it resulted in an inaccurate estimation of the monopile behavior. This had prompted many investigators to propose formulations to enhance the performances of Winkler model. In this paper, two case studies are considered. A case consisting of an OWT at Horns Rev (Denmark) supported by a monopile in a sandy soil was studied first. Taking the FEA using ABAQUS as reference, results of WILDOWER 1.0 (a Winkler computer code) using the recently proposed p–y curves giving design parameters were plotted and evaluated. In order to see the ability of proposed p–y curves to predict the monopile head movements, and consequently the first natural frequency (1st NF), a second case study consisting of a monopile supporting an OWT at North Hoyle (UK) was selected. The monopile head stiffness in terms of lateral, rocking, and cross-coupling stiffness coefficients, necessary for the 1st NF, were computed using both ABAQUS and WILDPOWER 1.0. Comparisons with the measured 1st NF showed that with the exception of one p–y model, none of other proposed Winkler methods is able to predict accurately this parameter.

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Section: Silicamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of sand p–y curves by predicting both monopile lateral response and OWT natural frequency

Amel

Bouzid

Bhattacharya

et al. 2022

Studia Geotechnica Et Mechanica

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“…the lateral force versus deflection (p-y) [16,17] and vertical friction versus displacement (t-z) relationships [18,19] (as illustrated in Figure 2), should be included in the analysis. [20], boundary element methods (BEMs) [21] and finite element methods (FEMs) [22,23]. Aiming to practical applications, this research adopts the efficient Line-Finite-Element (LFEM) analysis method [24], and further develops for the analysis of steel driven H-piles considering the SSI relationships, i.e.…”

Section: Introductionmentioning

confidence: 99%

Second-Order Direct Analysis for Steel H-Piles Accounting for Post-Driving Residual Stresses

2022

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"Driven steel H-piles are extensively adopted in engineering practice due to their convenience and efficiency in both economic and construction. The post-driving residual stress, a compressive axial stress distributed along the pile induced by the pile installation, might significantly deteriorate the pile bearing capacity. Thus, a large enough factor of safety is adopted in the traditional analysis to cover the influence caused by the post-driving residual stress. However, it sometimes leads to a large waste in costs and materials. Thus, the present study adopted the second-order analysis, a modern simulationbased design method, for the design of the driven steel H-pile. A robust and efficient finite element formula is necessary to conduct the second-order design method in practice. Hence, a new Line-Finite Element (LFE) formula is proposed in this paper. The developed LFE directly captures all the crucial factors in the analysis of the driven steel H pile, including the nonlinear Soil-Structure Interaction (SSI) and the post-driving residual stress. A validation example is presented at the end of this paper, which illustrates the accuracy and the computational efficiency of the proposed LFE formula."

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“…Owing to the harsh environmental conditions and high cost, the field test of large diameter monopile is difficult to carry out, hence the numerical analysis is more commonly used. Bouzid et al [3] pointed out that the finite element method is effective for the assessment of lateral loaded monopile and the conventional p-y curve method derived from field tests of a small diameter is not suitable for large diameter monopile. Achmus et al [4] evaluated the effect of pile diameter on p-y curves.…”

Section: Introductionmentioning

confidence: 99%

Deformation Analysis of Large Diameter Monopiles of Offshore Wind Turbines under Scour

Wang

Leng

et al. 2020

Applied Sciences

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The displacement of monopile supporting offshore wind turbines needs to be strictly controlled, and the influence of local scour can not be ignored. Using p–y curves to simulate the pile–soil interaction and the finite difference method to calculate iteratively, a numerical frame for analysis of lateral loaded pile was discussed and then verified. On the basis of the field data from Dafeng Offshore Wind Farm in Jiangsu Province, the local scour characteristics of large diameter monopile were concluded, and a new method of considering scour effect applicable to large diameter monopile was put forward. The results show that, for scour of large diameter monopiles, there was no obvious scour pit, but local erosion and deposition. Under the test conditions, the displacement errors between the proposed and traditional method were 46.4%. By the proposed method, the p–y curves of monopile considering the scour effect were obtained through ABAQUS, and the deformation of large diameter monopile under scour was analyzed by the proposed frame. The results show that, with the increase of scour depth, the horizontal displacement of the pile head increases nonlinearly, the depth of rotation point moves downward, and both of the changes are related to the load level. Under the test conditions, the horizontal displacement of the pile head after scour could reach 1.4~3.6 times of that before scour. Finally, for different pile parameters, the pile head displacement was compared, and further, the susceptibility to scour was quantified by a proposed concept of scour sensitivity. The analysis indicates that increasing pile length is a more reasonable way than pile diameter and wall thickness to limit the scour effect on the displacement of large diameter pile.

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Numerical Investigation of Large-Diameter Monopiles in Sands: Critical Review and Evaluation of Both API and Newly Proposed p-y Curves

Cited by 30 publications

References 41 publications

Evaluation of sand p–y curves by predicting both monopile lateral response and OWT natural frequency

Evaluation of sand p–y curves by predicting both monopile lateral response and OWT natural frequency

Second-Order Direct Analysis for Steel H-Piles Accounting for Post-Driving Residual Stresses

Deformation Analysis of Large Diameter Monopiles of Offshore Wind Turbines under Scour

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