Reliability analysis of pile foundation for an offshore wind turbine

Yoon, Gil-Lim; Kim, Sun Bin; Jun, Yi Byung

doi:10.3208/jgssp.kor-04

Cited by 3 publications

(5 citation statements)

References 3 publications

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“…In this study, a finite element analysis of the 5 m diameter monopipe structure was carried out. According to the American Petroleum Institute (API) design standard, t o is the wall thickness (mm), with D o being the diameter (mm)as denoted in Equation (7). The thickness of the monopile structure was then calculated from Equation ( 7) [35].…”

Section: Model For Fe Welding Analysismentioning

confidence: 99%

“…The mesh view of the component is shown in Figure 4. the wall thickness (mm), with D o being the diameter (mm)as denoted in Equation (7). The thickness of the monopile structure was then calculated from Equation ( 7) [35].…”

Section: Model For Fe Welding Analysismentioning

confidence: 99%

“…It is thus very important to ensure that structures used for offshore wind power are safe. To ensure this, many studies have been undertaken [1][2][3][4][5][6][7][8][9][10]. Lee et al used a centrifugal model to analyze and study the P-Y curve of a large-diameter monopile subjected to horizontal forces and moments under offshore wind [1].…”

Section: Introductionmentioning

confidence: 99%

“…These errors were due to misjudgments in the marine environment and construction [5]. Yoon et al used the response surface method to analyze the reliability of offshore wind monopile structures, while KIOST (The Korea Institute of Ocean Science and Technology) developed the reliability design program, which allowed the impact of marine loads, such as wind load and wave load on the monopile structures, to be analyzed [6,7]. Kim et al used the damage estimation method to infer damage, both by location and severity, to a monopile structure [8].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

et al. 2023

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The construction of new renewable energy infrastructures and the development of new ocean resources continues to proceed apace. In this regard, the increasing size and capacity of offshore wind turbines demands that the size of their accompanying supporting marine structures likewise increase. The types of marine structures utilized for these offshore applications include gravity base, monopile, jacket, and tripod structures. Of these four types, monopile structures are widely used, given that they are comparatively easy to construct and more economical than other structures. However, constant exposure to harsh cyclic environmental loads can cause material deterioration or the initiation of fatigue cracks, which can then lead to catastrophic failures. In this paper, a 3D fatigue finite element analysis was performed to predict both the fatigue life and the crack initiation of a welded monopile substructure. The whole analysis was undertaken in three steps. First, a 3D non-steady heat conduction analysis was used to calculate the thermal history. Second, a thermal load was induced, as an input in 3D elastoplastic analysis, in order to determine welding residual stresses and welding deformation. Finally, the plastic strain and residual stress were used as inputs in a 3D fatigue FE analysis in order to calculate fatigue crack initiation and fatigue life. The 3D fatigue finite element analysis was based on continuum damage mechanics (CDM) and elastoplastic constitutive equations. The results obtained from the 3D fatigue finite element analysis were compared with hot spot stresses and Det Norske Veritas (DNV-GL) standards.

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Section: Model For Fe Welding Analysismentioning

confidence: 99%

Section: Model For Fe Welding Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

et al. 2023

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“…Teixeira et al [15] examined the influence of geotechnical uncertainties on the reliability of vertically loaded pile foundations by using MCS and FORM and conducted a reliability sensitivity analysis to the source of these uncertainties. Yoon et al [16] explored practical implications of reliability analysis for the mono-pile foundation of an offshore wind turbine by RSM and MCS and investigated the sensitivities of mono-pile design parameters. Kawa et al [17] dealt with reliability analysis of cantilever sheet pile wall located in noncohesive soil with random properties by utilizing MCS technique, and the probability distributions of the results for different values of vertical and horizontal scales of fluctuation are obtained.…”

Section: Introductionmentioning

confidence: 99%

Reliability Assessment on Pile Foundation Bearing Capacity Based on the First Four Moments in High‐Order Moment Method

Xiao

Meng

et al. 2021

Shock and Vibration

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In this paper, the high-order moment method (HOMM) was developed for estimating pile foundation bearing capacity reliability assessment. Firstly, after the performance function was established, the first four moments (viz. mean, variance, skewness, and kurtosis) were suggested to be determined by a point estimate method based on two-dimensional reduction integrations. Then, the probability distribution of the performance function for the pile foundation bearing capacity was then approximated by a four-parameter cubic normal distribution, in which its distribution parameters are the first four moments. Meanwhile, the quantile of the probability distribution for the performance function and its reliability index was capable to be obtained through this distribution. In order to examine the efficiency of this method in engineering application, four pile foundations with different length-diameter radios were investigated in detail. The results demonstrate that the reliability analysis based on HOMM is greatly improved to the computational efficiency without loss precision compared with Monte Carlo simulation (MCS) and does not require complex partial derivative solving, checking point sought, and large numbers of iteration comparing with first-order reliability method (FORM). Moreover, the probability distribution function (PDF) approximated by the four-parameter cubic normal distribution was found to be consistent with that obtained by MCS. Eventually, the effects of parameter sensitivity for relative soil layer of the certain pile on reliability index were illustrated using the above-mentioned method. It indicated that the HOMM is an effective and simple approach for reliability assessment of the pile foundation bearing capacity.

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Failure-Mechanism and Design Techniques of Offshore Wind Turbine Pile Foundation: Review and Research Directions

et al. 2022

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Wind energy is one of the most sustainable and renewable resources for power generation. Offshore wind turbines (OWTs) derive significant wind energy compared to onshore installations. One of the greatest challenges encountered by installing the OWTs is the adequate design of their foundation in relatively soft and compressible marine soil. In most cases, the OWTs are supported by a single pile, termed as ‘monopile foundation’. Apart from the usual loads from the superstructure, these piles are subjected to complex loading conditions under static and cyclic modes in the axial, lateral, and torsional directions due to the primary actions of the wave, wind, and current. To incorporate an appropriate design methodology, understanding the failure mechanisms of such piles is of the utmost necessity. This review paper aims to focus on the progressive development in the analysis of failure mechanisms and design practice relevant to the monopile foundations for OWTs by theoretical and experimental studies conducted globally. An extensive literature survey has been carried out to study the gradual progress on offshore pile-soil interaction, failure mechanisms, and design techniques of OWT supporting monopile foundations. Based on the studies, a brief overview of the various aspects of analysis and design has been carried out, and the relevant conclusions are drawn therefrom.

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Reliability analysis of pile foundation for an offshore wind turbine

Cited by 3 publications

References 3 publications

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

Reliability Assessment on Pile Foundation Bearing Capacity Based on the First Four Moments in High‐Order Moment Method

Failure-Mechanism and Design Techniques of Offshore Wind Turbine Pile Foundation: Review and Research Directions

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