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Title:	Friction connection in tubular towers for a wind turbine
Abstract:	Innovative solution for assembling joints of a tubular tower for wind turbines has been studied by a European consortium since 2005 and the HISTWIN (High-Strength Steel Tower for Wind Turbine) project provides background for design of the friction connection considered. This solution is simpler to produce and 80% less expensive than traditional flange connection. A feasibility study at the production plant indicates that the towers would be easy to assemble in-situ. In addition to the direct costs savings due to technical simplicity of the solution, the higher fatigue endurance than the flange connection is experimentally established. The loss of pretension forces in the friction connection with long opened slotted holes is studied using segment shortterm and long-term static tests, fatigue tests, down-scaled bending tests and by a specimen used in a feasibility study. The total reduction of the costs for tower is estimated to about 10% to 15% compared to the traditional tower with the flange connection. Reibverbindung für Türme von Windenergieanlagen. Im Rahmen des europäischen RFCS (Research Fund for Coal and Steel) Projektes HISTWIN wird seit 2005 eine innovative Reibverbindung für Verbindungsstöße von Windenergieanlagen entwickelt und untersucht. Im Vergleich zur konventionellen Flanschverbindung ist die untersuchte Lösung sowohl einfacher als auch kostengünstiger herzustellen, wobei mit Einsparungen von bis zu 80% für die Verbindung gerechnet wird. Der problemlose Zusammenbau vor Ort wurde durch eine im Werk durchgeführte Machbarkeitsstudie überprüft. Weiterhin wurden experimentelle Untersuchungen zur im Vergleich zu konventionellen Flanschverbindungen höheren Ermüdungsbeanspruchbarkeit der Verbindungsmittel durchgeführt. Der Vorspannkraftverlust in der Langlochverbindung wurde auf Basis von statischen Kurzzeit- und Langzeitversuchen, Ermüdungsversuchen sowie skalierten 4-Punkt Biegeversuchen untersucht. Die sich aus der neuen Verbindung ergebenden Kosteneinsparungen belaufen sich auf ca. 10 bis 15%.
Source:	Stahlbau 79 (2010), No. 9
Page/s:	660-668
Language of Publication:	English

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