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7.2 Ingenieurbau

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  • Frei, Vivian (5)
  • Pirskawetz, Stephan (2)
  • Rogge, Andreas (2)
  • Thiele, Marc (2)
  • Meng, Birgit (1)

Erscheinungsjahr

  • 2019 (3)
  • 2018 (2)

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  • Beitrag zu einem Tagungsband (2)
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  • Posterpräsentation (1)

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  • Englisch (4)
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  • High-strength concrete (5) (entfernen)

Organisationseinheit der BAM

  • 7.2 Ingenieurbau (5) (entfernen)

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Characterizing the Fatigue Behavior of High-Performance Concrete for Wind Energy Structures (2019)
Frei, Vivian ; Thiele, Marc ; Pirskawetz, Stephan ; Meng, Birgit ; Rogge, Andreas
Severe mechanical fatigue conditions for worldwide proliferating windfarms are a Major challenge for high-performance concrete in towers, connecting joints and foundations of wind turbines. High-performance concrete offers potential for the application in offshore windfarms, not only regarding its good mechanical, but also chemical resistivity due to low diffusivity in the highly densified microstructure. For a more reliable fatigue assessment, monitoring based on nondestructive testing can be a valuable complement to design rules. Both approaches demand reliable experimental data, information about scalability and the development of standardized testing methods. This article presents results of an ongoing research program of BAM (Bundesanstalt für Materialforschung und -prüfung), which is a part of a joint national project (WinConFat) funded by the German Federal Ministry for Economic Affairs and Energy. The subproject implemented by BAM examines the fatigue behavior in dependence of size and slenderness for varying concrete strength at different stress levels. Besides fatigue strength, nondestructive testing is carried out additionally. Methods used are strain measurement and ultrasonic testing. The change of strain, stiffness and ultrasonic pulse velocity in the fatigue process is discussed. Results disclose a deeper insight into the damage process under cyclic loading of high-performance concrete and contribute to improve nondestructive monitoring.
Experimental investigation of size effect on fatigue behavior of high strength concrete - concept and preliminary results (2018)
Frei, Vivian ; Pirskawetz, Stephan ; Thiele, Marc ; Rogge, Andreas
The worldwide spread of windfarms brings new challenges, especially for concrete structures as a part of towers, connecting joints and foundations of wind turbines. High-cyclic loadings in such structures lead to a high relevance of the subject of fatigue. A proper assessment of the fatigue strength of concrete demands therefore a basis of reliable experimental data and the development of standardized testing methods. This article presents first results of an ongoing research program of BAM (Bundesanstalt für Materialforschung und -prüfung) which is a part of a joint project (WinConFat) funded by the German Federal Ministry for Economic Affairs and Energy. The subproject investigates the effects of size and slenderness of the specimens on the fatigue behaviour of high strength concrete at different stress levels. Not only the fatigue strength, but also the fatigue process itself is monitored by means of several measurement methods. Strain measurements are used to calculate the load dependent elastic modulus in the fatigue hysteresis as indicators for fatigue development. Furthermore, the application of non-destructive methods like acoustic emission analysis and ultrasonic measurement in laboratory tests gives a deeper insight into damage processes under cyclic loading. The results shall be used to improve design rules for concrete members under fatigue load and to develop or improve non-destructive techniques for in-service structural health monitoring.
Experimental investigation of size effect on fatigue behavior of high strength concrete - concept and preliminary results (2018)
Frei, Vivian
The worldwide spread of windfarms brings new challenges, especially for concrete structures as a part of towers, connecting joints and foundations of wind turbines. High-cyclic loadings in such structures lead to a high relevance of the subject of fatigue. A proper assessment of the fatigue strength of concrete demands therefore a basis of reliable experimental data and the development of standardized testing methods. This article presents first results of an ongoing research program of BAM (Bundesanstalt für Materialforschung und -prüfung) which is a part of a joint project (WinConFat) funded by the German Federal Ministry for Economic Affairs and Energy. The subproject investigates the effects of size and slenderness of the specimens on the fatigue behaviour of high strength concrete at different stress levels. Not only the fatigue strength, but also the fatigue process itself is monitored by means of several measurement methods. Strain measurements are used to calculate the load dependent elastic modulus in the fatigue hysteresis as indicators for fatigue development. Furthermore, the application of non-destructive methods like acoustic emission analysis and ultrasonic measurement in laboratory tests gives a deeper insight into damage processes under cyclic loading. The results shall be used to improve design rules for concrete members under fatigue load and to develop or improve non-destructive techniques for in-service structural health monitoring.
Characterizing the Fatigue Behavior of High-Performance Concrete for Wind Energy Structures (2019)
Frei, Vivian
Severe mechanical fatigue conditions for worldwide proliferating windfarms are a Major challenge for high-performance concrete in towers, connecting joints and foundations of wind turbines. High-performance concrete offers potential for the application in offshore windfarms, not only regarding its good mechanical, but also chemical resistivity due to low diffusivity in the highly densified microstructure. For a more reliable fatigue assessment, monitoring based on nondestructive testing can be a valuable complement to design rules. Both approaches demand reliable experimental data, information about scalability and the development of standardized testing methods. This article presents results of an ongoing research program of BAM (Bundesanstalt für Materialforschung und -prüfung), which is a part of a joint national project (WinConFat) funded by the German Federal Ministry for Economic Affairs and Energy. The subproject implemented by BAM examines the fatigue behavior in dependence of size and slenderness for varying concrete strength at different stress levels. Besides fatigue strength, nondestructive testing is carried out additionally. Methods used are strain measurement and ultrasonic testing. The change of strain, stiffness and ultrasonic pulse velocity in the fatigue process is discussed. Results disclose a deeper insight into the damage process under cyclic loading of high-performance concrete and contribute to improve nondestructive monitoring.
WinConFat - Materialermüdung von On- und Offshore Windenergieanlagen aus Stahlbeton und Spannbeton unter hochzyklischer Beanspruchung - Teilvorhaben der BAM - Einfluss von Probengeometrie und -größe auf die Ermüdung von Beton (2019)
Frei, Vivian
Das weltweite Wachstum der Windindustrie birgt neue Herausforderungen im speziellen für Betonstrukturen als Teil von Türmen, Verbindungselementen und Fundamenten von Windkraftanlagen. Aus der hochzyklischen Belastung in diesen Strukturen folgt eine große Bedeutung für das Thema mechanische Ermüdung. Eine gründliche Abschätzung der Ermüdungsfestigkeit von Beton bedarf deshalb einer zuverlässigen und experimentellen Datenbasis sowie der Entwicklung von standardisierten Prüfmethoden. Dieses Poster präsentiert erste Ergebnisse eines laufenden Forschungsprojektes an der BAM, welches Teil des vom Bundesministerium für Wirtschaft und Energie finanzierten Verbundvorhabens WinConFat ist. Das Teilvorhaben untersucht den Einfluss der Probengröße und Schlankheit von verschiedenen Proben auf das Ermüdungsverhalten von ultrahochfestem. Neben der Ermüdungsfestigkeit wird der Ermüdungsprozess mit verschiedenen Methoden charakterisiert. Dehnungsmessungen werden verwendet um den lastabhängigen E-Modul zu berechnen. Darüber hinaus geben die Ultraschall- und Schallemissionsprüfung einen tieferen Einblick in den Schädigungsprozess. Die Ergebnisse werden zu der Verbesserung von Bemessungsvorschriften beitragen.
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