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Author(s):	Hugenschmidt, Johannes; Fischer, Andreas; Schiavi, Lucio
Title:
Abstract:	Mittels Radaruntersuchungen werden Betondeckenbereiche einer Fläche von 2 × 0,9 m2 in Stützennähe in ausgewählten Einstellhallen zerstörungsfrei mit dem Ziel untersucht, typische Bewehrungselemente zur Erhöhung des Durchstanzwiderstands zu erkennen. Im Untersuchungsergebnis zeigte sich, dass diese Elemente, wie z.B. Bewehrungsstäbe, Stahlpilze oder Dübelleisten, mit hoher Wahrscheinlichkeit identifiziert werden können. Die Messdaten liefern für die meisten untersuchten Elementtypen spezifische, reproduzierbare Datenmuster. Mithilfe von Radaruntersuchungen ist es deshalb möglich, auf nicht dokumentierte Bewehrungselemente im Bauwerk zu schließen. Die Bauingenieure können so den Durchstanzwiderstand von Flachdecken im Bereich ihrer Stützen besser beurteilen. Das eröffnet Prüfmöglichkeiten zur Durchstanzproblematik in Bezug auf die Einhaltung technisch verbindlicher Normen sowie zur Untersuchung von Bauschäden oder deren Prophylaxe. Non-destructive inspection of punching shear reinforcement in concrete flat slabs In selected car parks, ground penetrating radar (GPR) surveys were carried out on ceiling areas in the vicinity of piles. The areas inspected were 0.9 m × 2.0 m each. The aim of the surveys was the detection Punching shear reinforcement (PSR). It was shown that several types of PSR can be detected reliably. The acquired GPR data show distinctive reflection patterns for most types of PSR. It is therefore possible to detect punching shear reinforcement in cases where appropriate documentation of the construction details is missing. Thus, GPR surveys can provide information relevant for the engineer for assessing the safety of buildings. This facilitates testing options related to the punching problem. Objects can be tested for compliance with existing standards, for the evaluation of structural damage or for prevention.
Source:	Beton- und Stahlbetonbau 109 (2014), No. 4
Page/s:	257-264
Language of Publication:	German

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