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Abstract:	Der folgende Beitrag stellt ein praxisorientiertes Bemessungskonzept für Grout-Verbindungen von Tragstrukturen für Offshore-Windenergieanlagen vor. Es werden zylindrische Verbindungen mit Schubrippen betrachtet. Die kombinierte Einwirkung von Biegemomenten und Normalkräften wird in dem Konzept direkt berücksichtigt und die übliche Nachweisführung über empirische Bemessungsformeln verlassen. Die wirklichkeitsnahe Abbildung der physikalischen Effekte in den Kontaktfugen erfolgt in zwei aufeinander abgestimmten Finite-Elemente-Modellen. Nach einer detaillierten Betrachtung der auftretenden Tragmechanismen in einer Verbindung ohne Schubrippen werden die vorhandenen physikalischen Effekte beim Vorhandensein von Schubrippen in einem Submodell untersucht. Die daraus gewonnenen Erkenntnisse über die Kraftverteilung zwischen Druckstreben und Reibverbund werden anschließend über vereinfachte Federmodelle in das globale numerische Modell integriert. Auf diese Weise kann mit vertretbarem numerischem Aufwand das reale Tragverhalten einer Grout-Verbindung mit Schubrippen zuverlässig nachgewiesen werden. Design of grouted joints of structures for offshore wind turbines taking the loading situation into consideration. The following article presents a practical design concept for grouted joints of structures for offshore wind turbines. Cylindrical connections with shear keys are considered. In this concept the combined action of bending moments and normal forces is directly taken into account thus the usage of empirical design formulas can be omitted. The realistic representation of physical effects in the contact joint is carried out in two complementary finite element models. After a detailed examination of the structural mechanisms that occur in a connection without shear keys, the existing physical effects in the presence of shear keys are examined in a sub model. The knowledge about the force distribution between the struts and the friction stresses is subsequently integrated in the global numerical model using simplified spring models. In this way the design calculations for a grouted joint with shear keys can be carried out with reasonable numerical effort taking into account the real structural behaviour.
Source:	Stahlbau 80 (2011), No. 9
Page/s:	687-692
Language of Publication:	German

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