Prediction of Long-Term Deformations of Offshore Wind Power Plant Foundations Using HCA-Based Engineer-Oriented Models

Wichtmann, Torsten; Triantafyllidis, Theodoros; Chrisopoulos, Stylianos; Zachert, Hauke

doi:10.17736/ijope.2017.fv05

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…HCA models are suitable to study arbitrary problems with highcyclic loading. For the prediction of the high-cyclic response of sand, the HCA model by Niemunis et al [55] is well established [39,44,57,63,64,68,79,83]. A corresponding model for clay is missing up to now.…”

Section: Introductionmentioning

confidence: 99%

A high-cycle accumulation model for clay and its application to monopile foundations

et al. 2022

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A high-cycle accumulation (HCA) model predicting the accumulation of permanent strain or excess pore water pressure in clay under a large number of load cycles is presented. Data from an extensive laboratory testing program on kaolin under undrained cyclic loading has been analysed for that purpose. The influence of strain amplitude, void ratio, stress ratio, overconsolidation ratio and loading frequency on the accumulation rates is considered in the constitutive equations of the HCA model. The proposed model is validated first by the simulation of element tests. Subsequently, its application to offshore wind turbine foundations under long-term lateral cyclic loading is presented by the back-analysis of a centrifuge test on a monopile in soft clay. The results are in good accordance with the measurements in terms of pile displacement and bending moment versus number of applied cycles. It is concluded that the proposed model is feasible to describe the long-term behaviour of clay subjected to high-cyclic loading.

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Section: Introductionmentioning

confidence: 99%

A high-cycle accumulation model for clay and its application to monopile foundations

et al. 2022

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“…In den FE‐Simulationen mit dem Akkumulationsmodell ist eine Untersuchung der gesamten Boden‐Bauwerk‐Interaktion während der Lebensdauer eines Bauwerks möglich. Ingenieurmodelle auf Basis der Gleichungen des Akkumulationsmodells wurden in vorgeschlagen.…”

Section: Zusammenfassungunclassified

Validierung eines hochzyklischen Akkumulationsmodells anhand von Modellversuchen und Messungen an realen Bauwerken

Wichtmann

Macháček

Zachert³

et al. 2018

Bautechnik

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Der vorliegende Beitrag fasst langjährige experimentelle und numerische Arbeiten am Institut für Bodenmechanik und Felsmechanik (IBF) des Karlsruher Instituts für Technologie (KIT) zusammen, mit denen das Ziel verfolgt wurde, das hochzyklische Akkumulationsmodell von Niemunis et al. (2005) für Sand zu validieren. Zunächst wird die zutreffende Wiedergabe der Ergebnisse dränierter zyklischer Triaxialversuche durch das Akkumulationsmodell demonstriert. Anschließend werden Finite‐Elemente‐Nachrechnungen von Modellversuchen an Monopilegründungen für Offshore‐Windenergieanlagen mit unterschiedlichen Maßstäben beschrieben. Für eine Validierung im Maßstab 1:1 wurde zunächst der Versuch der Ed. Züblin AG nachgerechnet, bei dem ein Prototyp einer aufgelösten Flachgründung für Offshore‐Windenergieanlagen durch simulierte Sturmereignisse zyklisch beansprucht wurde. Als weiteres gut dokumentiertes Randwertproblem im Maßstab 1:1 wurde die Schleuse Uelzen I betrachtet, bei der die zyklische Beanspruchung des Untergrunds aus den wechselnden Füllständen innerhalb der Schleusenkammer resultiert. Für alle untersuchten Randwertprobleme wird die Ermittlung der Eingangsgrößen der Simulationen, d. h. der Stoffkonstanten und der Zustandsparameter des Bodens erläutert, welche auf der Basis von Labor‐ bzw. Felduntersuchungen erfolgte. Die Ergebnisse der Finite‐Elemente‐Simulationen der verschiedenen Randwertprobleme werden den jeweiligen Labor‐ bzw. Feldmessungen gegenübergestellt.

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“…Owing to their relatively low computational costs, explicit methods have been already applied by several authors to the 3D FE analysis of cyclically loaded monopiles (Achmus et al, 2009;Jostad et al, 2014;Wichtmann et al, 2017;Chong, 2017;. Explicit models rely on extensive laboratory testing programmes, and build on the translation of cyclic loading histories into sequences of Ndriven monotonic steps.…”

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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Prediction of Long-Term Deformations of Offshore Wind Power Plant Foundations Using HCA-Based Engineer-Oriented Models

Cited by 6 publications

References 5 publications

A high-cycle accumulation model for clay and its application to monopile foundations

A high-cycle accumulation model for clay and its application to monopile foundations

Validierung eines hochzyklischen Akkumulationsmodells anhand von Modellversuchen und Messungen an realen Bauwerken

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

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