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Author(s):	Willers, Kerstin; Gerlach, Lutz; Herrmann, Nico; Dehn, Frank
Title:
Abstract:	Bei zyklisch beanspruchten Betontragwerken besteht die Herausforderung, die Nutzungsdauer zunehmend filigraner Baustrukturen und vorgespannter Systeme mit sehr hohen Lastwechselzahlen N = 107 bemessungstechnisch abzusichern. Dies erfordert technische Spezifikationen, die unter Berücksichtigung eines hinreichend genauen Materialverständnisses das Ermüdungsverhalten unter sehr hohen Lastwechselzahlen realitätsnah abbilden. Die derzeitigen Bemessungsgrundlagen in Form von Wöhlerlinien beschränken sich für Betonbauteile bisher auf versuchstechnisch verifizierte Lastwechselzahlen bis N = 107. Durch die Entwicklung einer gezielt zum Schwingen anregbaren Versuchsvorrichtung war es am IMB/MPA Karlsruhe des Karlsruher Instituts für Technologie (KIT) möglich, erste Versuche an einem hochfesten Beton C120 unter Nutzung eines Hochfrequenzpulsators zur Erzeugung von Druckschwellbeanspruchungen durchzuführen. Der Beitrag fasst die Untersuchungsergebnisse zusammen und weist auf weitergehende thematische Fragestellungen bezüglich des Ermüdungsverhaltens von Beton unter sehr hohen Lastwechselzahlen hin. Fatigue characteristics of high-strength concrete with very high numbers of load cycles For more and more filigreed as well as prestressed concrete structures very high numbers of load cycles N = 107 occur during service life. This shall be implemented in adequate design rules. Therefore, technical specifications reflecting cyclic actions with very high numbers of load cycles and a sufficient precise understanding of fatigue behavior of the building materials are necessary. Currently available design rules based on S-N curves for concrete building components are verified by testing up to a number of load cycles N of not more than N = 107. Using a special test rig at IMB/MPA Karlsruhe of Karlsruhe Institute of Technology (KIT), tests with specimens made of a high-strength concrete grade C120 were carried out, including the development and verification of the suitability of this test method. The following article summarizes the test results and points out unknown thematic aspects due to fatigue of concrete structures with very high numbers of load cycles.
Source:	Beton- und Stahlbetonbau 115 (2020), No. 11
Page/s:	848-857
Language of Publication:	German

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