Ocean Brick System (OBS) as a foundation structure for offshore wind turbine - An experimental study for wave loads and stability

Oumeraci, Hocine; Pfoertner, Saskia; Kudella, Matthias; Kortenhaus, Andreas

doi:10.1680/cmsb.41318.0008

Cited by 3 publications

(2 citation statements)

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“…The OBS consisting of hollow precast blocs (10 m × 10 m × 10 m), piled like interconnected cubes, to create a stiff, light, strong structure. The structure can be constructed in a dry dock and floated to the site with the support of tugboats (Oumeraci, 2009).…”

Section: Rockmat and The Ocean Brick System (Obs)mentioning

confidence: 99%

Analysis, design and construction of gravity offshore structure; state-of-the-art

Okpe¹,

Edeh²

2022

IJAESA

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Offshore platforms are divided into many types which are mainly categorized according to waterdepth in the installation location. However, the design differs for each type to accomplish the target of the operation. But for some case of sea waterdepths and an aggressive environment such as the North Sea, steel ones are not suitable, so the heaviest type called gravity platform having enormous mass is used. This type of platform has its special requirements and procedures for construction and needs special types of construction materials in order to resist the climate factors applied due to the aggressive environment. The paper carefully illustrates how the principal Environmental loads (wind and wave), current forces, loads from ice and loads from earth-quake for (earth-quake prone zones) are deployed to archive the design and construction of offshore concrete gravity platforms. Two design methods (Analysis and Design of Shell structures) and the Tangent Modulus Methods of design of Offshore Concrete Gravity platforms are discussed

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Section: Rockmat and The Ocean Brick System (Obs)mentioning

confidence: 99%

Analysis, design and construction of gravity offshore structure; state-of-the-art

Okpe¹,

Edeh²

2022

IJAESA

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“…The ocean brick system (OBS) (Technical University Braunschweig) is a modular system consisting of hollow precast blocs (10 m × 10 m × 10 m), piled like interconnected cubes, to create a stiff, light, strong structure. The structure can be constructed in a dry dock and floated to the site with the support of tugboats [30].…”

Section: Other Related Conceptsmentioning

confidence: 99%

Gravity-Based Foundations in the Offshore Wind Sector

Esteban

Gutiérrez

Negro

2019

JMSE

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In recent years, the offshore wind industry has seen an important boost that is expected to continue in the coming years. In order for the offshore wind industry to achieve adequate development, it is essential to solve some existing uncertainties, some of which relate to foundations. These foundations are important for this type of project. As foundations represent approximately 35% of the total cost of an offshore wind project, it is essential that they receive special attention. There are different types of foundations that are used in the offshore wind industry. The most common types are steel monopiles, gravity-based structures (GBS), tripods, and jackets. However, there are some other types, such as suction caissons, tripiles, etc. For high water depths, the alternative to the previously mentioned foundations is the use of floating supports. Some offshore wind installations currently in operation have GBS-type foundations (also known as GBF: Gravity-based foundation). Although this typology has not been widely used until now, there is research that has highlighted its advantages over other types of foundation for both small and large water depth sites. There are no doubts over the importance of GBS. In fact, the offshore wind industry is trying to introduce improvements so as to turn GBF into a competitive foundation alternative, suitable for the widest ranges of water depth. The present article deals with GBS foundations. The article begins with the current state of the field, including not only the concepts of GBS constructed so far, but also other concepts that are in a less mature state of development. Furthermore, we also present a classification of this type of structure based on the GBS of offshore wind facilities that are currently in operation, as well as some reflections on future GBS alternatives.

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Wave Loads and Stability of New Foundation Structure for Offshore Wind Turbines Made of Ocean Brick System (Obs)

Pfoertner

Oumeraci

Kudella

et al. 2011

Int. Conf. Coastal. Eng.

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The Ocean Brick System (OBS) is a modular system consisting of hollow concrete precast blocs (10m x 10m x 10m) piled up like cubes and interconnected to create a stiff, light and strong structure which can be used for artificial islands, artificial reefs, elevation of vulnerable low lands, deep water ports, breakwaters and foundation of offshore wind turbines. The paper focuses on the experimental results on the wave loading and the stability of the OBS used as a foundation of the support structure of offshore wind turbines. Diagrams for the prediction of total horizontal forces, vertical forces and overturning moments induced by irregular waves on the OB-structure are derived and verified through additional stability tests and stability analysis.

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Ocean Brick System (OBS) as a foundation structure for offshore wind turbine - An experimental study for wave loads and stability

Cited by 3 publications

References 0 publications

Analysis, design and construction of gravity offshore structure; state-of-the-art

Analysis, design and construction of gravity offshore structure; state-of-the-art

Gravity-Based Foundations in the Offshore Wind Sector

Wave Loads and Stability of New Foundation Structure for Offshore Wind Turbines Made of Ocean Brick System (Obs)

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