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Author(s):	Osterminski, Kai; Hiemer, Florian
Title:
Abstract:	Infolge dynamischer Belastung von Stahlbetontragwerken (Windenergieanlagen) kann es auch bei Lasten unterhalb der statischen Festigkeit zu Materialermüdung im Betonstahl kommen. Materialseitig wird die dynamische Festigkeit im Dauerschwingversuch geprüft. Neben der Oberflächengeometrie, der chemischen Zusammensetzung hängt das Dauerschwingverhalten auch vom Belastungsregime ab. Im vorliegenden Beitrag wurden theoretische Berechnungen zur verrichteten physikalischen Arbeit während den Dauerschwingversuchen durchgeführt und in einer Parameterstudie für unterschiedliche Lastregime ausgewertet. Vergleichende experimentelle Untersuchungen zeigten, dass die Ergebnisse des Lastregimes mit fixierter Oberspannung zur Prüfung von Betonstahl nicht den theoretischen Berechnungen gleichen. Vor diesem Hintergrund ist zu diskutieren, inwieweit die Rahmenbedingungen des Dauerschwingversuchs die Absicht der Quantifizierung einer realitätsnahen Wöhlerlinie für Betonstahl tatsächlich erlauben. Investigations of the test methodology in fatigue tests of reinforcing steel - Considerations on physical work Cyclic loading of reinforced concrete structures (e. g. wind energy plants) can cause fatigue fractures in reinforcing steel even with loads far below its yield strength. The dynamic tensile strength of rebars is determined in the fatigue tests of which the results strongly depend on the geometry and chemical composition of the reinforcing steel. Furthermore, the influence of the load regime has to be taken into account. In this paper, theoretical calculations of the physical work borne during the fatigue tests were carried out on three different load regimes within a parameter study. Comparative experimental investigations showed that the results of the load regime with fixed upper stress level (for testing reinforcing steel according to DIN EN ISO 15630-1) could not be explained by theoretical calculations. The results seem to depend more on process factors and surface conditions of the rebars than on the tests boundary conditions. Hence, it should be discussed to what extent the boundary conditions of the fatigue test allow for an actual quantification of a S-N-curve for reinforcing steel.
Source:	Beton- und Stahlbetonbau 115 (2020), No. 11
Page/s:	858-867
Language of Publication:	German

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