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Abstract:	Im Rahmen eines Forschungsvorhabens an der TU München wurde eine optimierte Bauweise für Windkrafttürme aus Brettsperrholz entwickelt. Der Turmschaft besteht dabei aus Brettsperrholzplatten in straßentransportfähigen Abmessungen, welche in einer Taktstation am Boden zu vieleckigen Turmabschnitten zusammengefügt und anschließend als vorgefertigte ringförmige Elemente vertikal zu einem Turm verbunden werden. Die horizontalen Verbindungen werden über formschlüssige Kontaktstöße realisiert. Biegezugspannungen in Turmlängsrichtung, vor allem infolge von Windeinwirkungen, werden durch dauerhaft wirksame vertikale Vorspannkräfte überdrückt. Anhand eines Beispielturms mit 100 m Nabenhöhe wurden alle Bauzustände, die Tragfähigkeit und das Langzeitverhalten rechnerisch untersucht. Die Spannkraftverluste sind beherrschbar und liegen nicht wesentlich höher als bei vergleichbaren vertikal vorgespannten Türmen in Spannbetonbauweise. Prestressed CLT wind-turbine towers Within a research project at the Technical University of Munich, an optimized construction was developed for wind turbine towers made of cross-laminated timber. The tower shaft consists of panels of cross-laminated timber in transportable dimensions, which are joined in a station at the bottom of the tower to form polygonal tower sections, which are subsequently connected afterwards as prefabricated elements to form the tower. The horizontal joints are realized by form-fitting contact. Stresses in bending tension in the longitudinal direction of the tower, mainly due to the effects of winds, are superposed by permanently effective vertical prestressing forces. By means of an example a tower with a hub height of 100 m, all building conditions, the load bearing capacity and long-term behavior were investigated and calculated. Prestress losses are predictable and not significantly higher compared to vertically prestressed towers of reinforced concrete.
Source:	Bautechnik 94 (2017), No. 11
Page/s:	804-811
Language of Publication:	German

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