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Schaumann P.,Leibniz University of Hanover | Bechtel A.,Leibniz University of Hanover | Lochte-Holtgreven S.,Grbv Ingenieure im Bauwesen GmbH | Wilke F.,RWE Offshore Logistics Company GmbH
Stahlbau | Year: 2014

Grouted joints as hybrid tube-to-tube connections with high-strength concrete annulus are often used in monopile substructures for offshore wind energy conversion systems. Compared to jackets or tripods, grouted joints in monopiles are loaded by predominant bending moments. Currently, only a limited number of design and calculation methods for the stress design are available. Besides simplified engineering models based on linear shell theory, numerical calculation methods and models have been developed in recent years. Those models include material and geometrical nonlinearities of a grouted joint under predominant bending. In this paper three different analysis methods are presented, their accuracy is described by calculated and measured displacements and stresses. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source


Lochte-Holtgreven S.,Grbv Ingenieure im Bauwesen GmbH | Bechtel A.,Leibniz University of Hanover
Stahlbau | Year: 2014

Grouted joints in monopile substructures are exposed to high cyclic loads. Based on theoretical and experimental investigations, this paper presents discovered reasons and discusses the design driving parameters for these grouted joints in the context of vertical settlements in grouted joints without shear keys which have become public knowledge in 2009. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source


Schwegmann D.,E.ON | Kossel T.,Grbv Ingenieure im Bauwesen GmbH | Gohlmann J.,Grbv Ingenieure im Bauwesen GmbH | Lochte-Holtgreven S.,Grbv Ingenieure im Bauwesen GmbH
Stahlbau | Year: 2014

The offshore wind farm Amrumbank West is located 35 km in the north of Helgoland and 35 km kilometers in the west of the island of Amrum in the exclusive economic zone of Germany. The installation of Amrumbank West is currently ongoing. After more than three years of development and certification, this paper deals with the main topics of planning and certification of the offshore wind farm. Besides the design driving parameters which have been already considered during the conceptual design phase of the 80 monopile substructures in nearly 25 m water depths, specific features of the certification process will be discussed. Furthermore, first milestones of the installation and special technical solutions are presented. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

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