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Author(s):	Collmann, Mareike; Kohlmeier, Martin; Widerspan, Viktor; Schenk, Alexander
Title:
Abstract:	Tragstrukturen von Windenergieanlagen sind längst Serienprodukte. Allein in der deutschen Nord- und Ostsee sind mittlerweile etwa 1 350 Offshore-Windenergieanlagen (OWEA) installiert. Die großen Dimensionen, die hohen dynamischen Beanspruchungen und die spezifischen Umgebungsbedingungen offshore sind besonders herausfordernd und im Grenzbereich dessen, was Bemessungsvorschriften abdecken. Dennoch treten an Tragstrukturen bisher wenige schwerwiegende Schäden auf. Dies ist selbstredend positiv, bedeutet auf der anderen Seite aber auch, dass möglicherweise Potenzial besteht, die Strukturen schlanker auszulegen. Der Kostendruck erfordert es, diese Traglastreserven genauer zu quantifizieren und Potenziale aufzuzeigen. Insbesondere großmaßstäbliche Versuche bieten die Möglichkeit, Konstruktion und Auslegung individueller und damit effizienter zu gestalten. Seit 2014 werden im Testzentrum Tragstrukturen Hannover (TTH) großmaßstäblich Komponenten und Bauteile analysiert, geprüft und damit Berechnungsgrundlagen validiert. In diesem Beitrag werden wesentliche Ergebnisse aus der Projektbearbeitung der jüngeren Vergangenheit vorgestellt. Die betrachteten Projekte adressieren die Erarbeitung von Turmkonzepten in Stahlbauweise für große Nabenhöhen, die Untersuchung des Ermüdungsverhaltens dickwandiger Schweißkonstruktionen auch unter dem Aspekt des Korrosionsschutzes und die Untersuchung eines Structural-Health-Monitoring-Systems zur Überwachung der Zuverlässigkeit von Grout-Verbindungen. Design at the limit - opportunities of large scale physical testing for an efficient design Support structures for wind energy converters have become serial products. More than 1 350 wind turbines are installed offshore only in the German North and Baltic Sea. Structures of large dimensions being highly dynamically loaded and located in a harsh offshore environment are challenging and moving at the limit of design standards. However, serious damages are rare. This is obviously positive, but meaning on the other side that there might be potential for dimensioning structures more efficiently. Driven by high cost pressure these reserves have to be quantified and potentials have to be demonstrated. Large scale experiments in particular offer possibilities for a more individual design of structures. With the objective of validating and optimising design approaches the Test Center for Support Structures in Hannover was founded in 2014. Here, large scale components and structures can be analysed and tested. This paper summarises the findings of research projects in the recent past. The regarded projects deal with the development of new tower concepts in steel for large hub heights, with the fatigue of thick-walled welded structures considering special aspects of corrosion, and with the development of a structural health monitoring system in order to ensure the reliability of grouted connections.
Source:	Stahlbau 88 (2019), No. 6
Page/s:	540-548
Language of Publication:	German

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