Technical testing influences on the fatigue behaviour of highstrength grouting mortar High-strength grouting concretes are commonly used in the wind energy industry, where they are exposed to high cyclic stresses. However, so far, concerning the fatigue behaviour of these concretes is hardly any research available. Therefore, there are still considerable uncertainties regarding the fatigue behaviour of high-strength grouting concretes. At the Institute of Building Materials Science, Leibniz Universität Hannover, deviating fatigue behaviour of high-strength grouting concretes compared to a common high-strength concrete could be determined in first investigations. The results of the investigations indicate that the differences in the fatigue behaviour are occurring due to various technical test influences, which exercise a stronger influence on the fatigue behaviour for high-strength grouting concrete than common concrete. In particular, the testing frequency has a strong influence on the results of the fatigue investigations. Along with the testing frequency, the specimen heating due to the cyclic loading influences the results of the fatigue investigations. In this paper first results of the investigations concerning the fatigue behaviour of highstrength grouting mortar and technical testing influences and their impact on the fatigue behaviour are presented.
Die aktuellen Entwicklungen in der Windenergiebranche führen zu Windenergieanlagen mit immer höherer Leistungsfähigkeit. Als Konsequenz aus dieser Entwicklung steigen mit der Leistungsfähigkeit der Anlagen auch die Beanspruchungen der Konstruktion. Hochleistungsbetone mit selbstverdichtenden Eigenschaften werden in Windenergieanlagen schon seit einiger Zeit zur Herstellung von Verbindungen zwischen den einzelnen Bauteilen verwendet. Darüber hinaus werden derzeit aufgelöste Gründungskonstruktionen und Türme aus Spannbeton, für die hochfester Beton eingesetzt wird, entwickelt. Diese Hochleistungsbetone sind für den Grenzzustand der Ermüdung zu bemessen, was zukünftig nach fib‐Model Code 2010 erfolgen wird. Dieser enthält ein geändertes Ermüdungsbemessungsmodell für Beton, das auch für hochfeste Betone zu sicheren und wirtschaftlichen Bemessungsergebnissen führt. Am Institut für Baustoffe der Leibniz Universität Hannover wird seit Jahren das Ermüdungsverhalten von Hochleistungsbetonen untersucht. Darüber hinaus wird auch der Einfluss von Stahlfasern auf das Ermüdungsverhalten von Hochleistungsbetonen erforscht. In diesem Beitrag werden aktuelle Forschungsergebnisse zum Ermüdungsverhalten verschiedener Hochleistungsbetone mit und ohne Stahlfaserverstärkung vorgestellt und darauf aufbauend der praktische Einsatz dieser Betone diskutiert. Die Ergebnisse der durchgeführten Untersuchungen werden im Kontext zum neuen Ermüdungsbemessungsmodell des fib‐Model Code 2010 interpretiert.Fatigue behaviour of high performance concretes for wind turbinesNew developments in the wind energy sector will lead to wind turbines with enormous capacities. As a result, the loads of the supporting structures are also increasing. For some time now, high performance concretes with self‐compacting properties have been used in wind turbines for structural connections. Furthermore, slender foundations and prestressed concrete supporting structures made out of high‐strength concrete are under development. In future, fatigue design of these high performance concretes is to be done according to the new fib‐Model Code 2010. This code includes a new fatigue design model which enables a safe and economic fatigue design, even for high strength concrete. Extensive research with regard to the fatigue behaviour of different types of high performance concrete has been carried out at the Institute of Building Materials Science, Leibniz Universität Hannover. As part of these research activities, the influences of steel fibre reinforcement on the fatigue behaviour of high performance concretes are being investigated. In this paper, interim results of these investigations are presented and the potential for the practical applications of high performance concrete is discussed. The results of the conducted investigations are presented in comparison with the new fatigue design model of the fib‐Model Code 2010.
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