Selection, Design and Construction of Offshore Wind Turbine Foundations

Malhotra, Sanjeev

doi:10.5772/15461

Cited by 53 publications

(31 citation statements)

References 4 publications

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“…Wind turbine foundation has performance requirements that must be met to ensure satisfactory operation of the wind turbine. For offshore wind turbines, the maximum allowable tilt at pile head is 0.5 o (Malhotra, 2011). However, the allowable tilt will become smaller if we consider the tilt error that occurs during the construction.…”

Section: Tilt At Pile Headmentioning

confidence: 99%

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Effect of monopile foundation modeling on the structural response of a 5-MW offshore wind turbine tower

et al. 2015

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Offshore wind turbine towers experience large base moments because of wind and wave loading. The flexibility of the foundation should be considered when analyzing the structural response of towers. Previous studies showed that conventional p-y curves are not suitable in designing the foundation. More advanced methods, such as the finite element method, are necessary to model the offshore wind turbine foundation. In addition, these studies focused on the analysis of the foundation itself, so the effect on the structural response of the tower merits further research. The present study aimed to compare different foundation modeling approaches, focusing on their effects on the structural response of the wind turbine tower. We integrated wind turbine aerodynamic simulation with different models of the foundation. We confirmed that ignoring the flexibility of the foundation caused significant error in wind turbine tower behaviour.Between the p-y curve-based model and finite element-based model, the change in maximum moment was insignificant, but the maximum tilt angle increased over 14% in the finite element model. Therefore, the finite element approach is recommended to obtain a conservative design when large tilt angles may cause serviceability issues.

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Section: Tilt At Pile Headmentioning

confidence: 99%

“…However, the allowable tilt will become smaller if we consider the tilt error that occurs during the construction. Typical construction tolerances range from 0.2 o to 0.25 o (Malhotra, 2011). Therefore, if we subtract the construction error up to 0.25 o , the maximum allowable tilt at pile head will be 0.25 o .…”

Section: Tilt At Pile Headmentioning

confidence: 99%

Effect of monopile foundation modeling on the structural response of a 5-MW offshore wind turbine tower

et al. 2015

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“…A somewhat larger tilt 0.009 (0.5 degrees) may be allowed for offshore wind turbines (Malhotra, 2011). The displacement contour of foundation and soil under different ULS conditions are given in Fig 4. It can be seen that for ULS-5 (Fig.…”

Section: Displacements Under Uls Conditionsmentioning

confidence: 99%

Bearing Capacity of the High-Rise Pile Cap Foundation for Offshore Wind Turbines

Qi¹,

Tian²,

Zheng³

et al. 2014

Sustainable Development of Critical Infrastructure

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Abstract:A proper foundation design is crucial for the structural stability of offshore wind turbines (OWT) in the severe ocean environments. As one of the typical foundation type for OWT, the high-rise pile cap foundation has been utilized in wind farm of China. In this study, a 3-dimensional finite element model for simulating the pile-soil interaction subjected to multiaxis complex loads is proposed and verified with existing experimental data. The bearing capacity of the high-rise pile cap foundation under various ultimate limit state (ULS) conditions is investigated. Local scour usually occurs around the pile and significantly reduces the bearing capacity of the foundation. Numerical simulation shows that scour could amplify the lateral displacement and tilt of the foundation.

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“…In general, the upper tower is composed of a conical steel pipe, whereas various types of substructures can be designed according to field conditions. The substructure is used to anchor the support structure to the seabed and typically belongs to one of six types: gravity, monopile, tripod, jacket, suction, and floating foundation [2,3]. Based on current design philosophy, gravity-based structures are preferred for shallow waters (up to 5 m), whereas the monopile foundation is used for wind farms in water depths up to 20 m. For deeper water, tripod or jacket support structures are often considered.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Structural Properties between Monopile and Tripod Offshore Wind-Turbine Support Structures

Chen

Huang

Bretel

et al. 2013

Advances in Mechanical Engineering

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Offshore wind power provides a new kind of green energy. This paper presents a comparison study on the structural properties of monopile and tripod wind-turbine support structures, which are used extensively in offshore wind farms. Both structures have the same upper tower, but different lower structures, one with a monopile and the other with a tripod. Static, fatigue, and modal analyses indicate that both the tripod and monopile structures are feasible in the field, but that the tripod structure is superior to the monopile structure. Static analysis reveals that the location of maximum stress in the monopile structure is different from that in the tripod structure, and that the tripod structure shows higher stiffness and greater stress-control capacity than the monopile structure. Fatigue analysis indicates that the tripod structure has a longer lifetime than the monopile structure. Modal analysis indicates that the two structures exhibit large differences in their natural frequencies. Unlike the monopile structure, the third and first modes both have a substantial influence on the dynamic response of the tripod structure.

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Selection, Design and Construction of Offshore Wind Turbine Foundations

Cited by 53 publications

References 4 publications

Effect of monopile foundation modeling on the structural response of a 5-MW offshore wind turbine tower

Effect of monopile foundation modeling on the structural response of a 5-MW offshore wind turbine tower

Bearing Capacity of the High-Rise Pile Cap Foundation for Offshore Wind Turbines

Comparison of Structural Properties between Monopile and Tripod Offshore Wind-Turbine Support Structures

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