Biaxial Loading of Offshore Monopiles: Numerical Modeling

Sheil, Brian B.; McCabe, Bryan A.

doi:10.1061/(asce)gm.1943-5622.0000709

Cited by 21 publications

(5 citation statements)

References 34 publications

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“…Results of the force-displacement curve at the pile head are presented in Figure 10a, and compared with experimental values as well as the results of a 3D FE model proposed by Sheil & McCabe (2017), to compare the performance of this 1D model with that of a 3D model. It is noted that the experimental model has experienced ratcheting, as the P-y curve has undergone a translation from being centred on the origin and has experienced some degree of stiffening.…”

Section: Static Cyclic Loadingmentioning

confidence: 99%

A practical two-parameter model of pile–soil gapping for prediction of monopile offshore wind turbine dynamics

2024

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Monopile mounted offshore wind turbines (OWTs) are expected to experience a very large number of cyclic loads throughout their operational lifetime, and the existing p-y method of foundation modelling does not fully account for the effects of dynamic cyclic loading, such as pile-soil gapping. In this paper a dynamic model based on the beam-on-nonlinear-Winkler-foundation scheme with a novel algorithm capable of capturing the effects of pile-soil gapping is presented. It can account for gap cave in, and the resulting gap size can react dynamically to changing loading amplitudes, using only two calibration parameters. Static and dynamic cyclic loaded model validations are presented, and give very good agreement to experimental results, performing better than existing p-y curves for dynamic loading. The model is also applied to an OWT case study and predictions of natural frequency reduction due to soil erosion agree well with measured results. It is shown that the inclusion of gapping may result in a significant decrease to the natural frequency prediction of OWTs relative to the value predicted without gapping. As such, not considering gapping could lead to unconservative predictions, and any additional soil degradation throughout the serviceable lifetime could therefore result in unwanted resonance. The method provided in this paper provides a simple and accurate model to predict this behaviour which is crucial to ascertain during the design phase.

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Section: Static Cyclic Loadingmentioning

confidence: 99%

A practical two-parameter model of pile–soil gapping for prediction of monopile offshore wind turbine dynamics

2024

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“…The soil type used in the current study is Fontainebleau sand which is a well-sorted clean sand with particle diameters ranging from 0.063 mm to 0.25 mm (Latini and Zania, 2017). The HS parameters for the soil are chosen as those used in Sheil and McCabe (2016). Table 2 presents the Fontainebleau sand data employed in the current study.…”

Section: Soil Model and Soil Propertiesmentioning

confidence: 99%

Numerical Simulation of Ground Anchor-Soil Nail Retaining Systems for Academic-Learning Purposes

Panaghi

2022

UKH J SCI ENG

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The ever-expanding urban architecture in developing areas requires more land space for construction purposes to be available. For this, utilizing the sub-surface areas through excavations in populous cities is now on the increasing trend. Two major concerns in such excavation projects are excavation-wall stability and the induced ground settlements which can be countered by a soil nailing-ground anchor system. In this regard, influential factors such as nail length and nail inclination angles can affect the overall performance of stabilized ground. Therefore, the focus of the present study is on how the aforementioned influence excavation-induced ground deformations. The numerical simulation is conducted using the software Plaxis 2D. The established numerical models help to explain how changes in the nails’ inclination angles and anchor lengths can change the observed behavior of the walls; from which helpful tips for practicing engineers are drawn accordingly. Such results could also be utilized for classroom presentations to aid students’ understanding of geotechnical engineering concepts.

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“…In contrast, the implicit approach is more 'conventional' in that it encompasses the simulation of cyclic soil behaviour as a causal sequence of stress/strain increments, to be integrated in the time domain (step-by-step integration). To date, 0D-implicit and 3D-explicit approaches have been preferred to implicit 3D simulations -so far only rarely applied to monopile tilt problems (Barari et al, 2017;Sheil & McCabe, 2017). Nonetheless, implicit 3D FE modelling appears to possess higher potential to explain/predict governing geo-mechanisms (Pisanò, 2019;Jostad et al, 2020;Liu, 2020;Cheng et al, 2021), and is being increasingly adopted to study the cyclic/dynamic performance of OWTmonopile-soil systems (Cuéllar et al, 2014;Kementzetzidis et al, 2018Kementzetzidis et al, , 2019Kementzetzidis et al, , 2020.…”

Section: Introductionmentioning

confidence: 99%

From cyclic sand ratcheting to tilt accumulation of offshore monopiles: 3D FE modelling using SANISAND-MS

et al. 2022

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Serviceability criteria for offshore monopiles include the estimation of long-term, permanent tilt under repeated operational loads. In the lack of well-established analysis methods, experimental and numerical research has been carried out in the last decade to support the fundamental understanding of monopile–soil interaction mechanisms, and the conception of engineering methods for monopile tilt predictions. With a focus on the case of monopiles in sand, this work shows how step-by-step/implicit, three-dimensional (3D) finite-element (FE) modelling can be fruitfully applied to the analysis of cyclic monopile–soil interaction and related soil deformation mechanisms. To achieve adequate simulation of cyclic sand ratcheting and densification around the pile, the recently proposed SANISAND-MS model is adopted. The link between local soil behaviour and global monopile response to cyclic loading is discussed through detailed analysis of model prediction. Overall, the results of numerical parametric studies confirm that the proposed 3D FE modelling framework can reproduce relevant experimental evidence about monopile–soil interaction, and support future improvement of engineering design methods.

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Biaxial Loading of Offshore Monopiles: Numerical Modeling

Cited by 21 publications

References 34 publications

A practical two-parameter model of pile–soil gapping for prediction of monopile offshore wind turbine dynamics

A practical two-parameter model of pile–soil gapping for prediction of monopile offshore wind turbine dynamics

Numerical Simulation of Ground Anchor-Soil Nail Retaining Systems for Academic-Learning Purposes

From cyclic sand ratcheting to tilt accumulation of offshore monopiles: 3D FE modelling using SANISAND-MS

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