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Author(s):	Classen, Martin; Hegger, Josef
Title:
Abstract:	Experimentelle Untersuchungen aus der Literatur zeigen, dass die Schubtragfähigkeit von Verbunddübelleisten mit Ausstanzversagen durch Querrisse im Betongurt vermindert wird. Bisher sind allerdings weder die hierbei auftretenden Tragmechanismen geklärt noch wird der Querrisseinfluss in den einschlägigen Bemessungsmodellen für Verbunddübelleisten berücksichtigt. Daher werden im vorliegenden Beitrag 38 Abscherversuche im gerissenen Beton vorgestellt, die neue Erkenntnisse über das Schubtragverhalten von Verbunddübelleisten mit Ausstanzversagen im gerissenen Beton liefern. Die Versuche wurden in einem neuartigen Versuchstand durchgeführt, der eine gezielte Untersuchung der Einflüsse Rissabstand und Rissbreite ermöglicht. Anhand der Versuchsergebnisse werden die auftretenden Tragmechanismen analysiert und die Phänomenologie des Ausstanzens im gerissenen Beton erläutert. Alle hier vorgestellten Untersuchungen wurden im Rahmen von [1] durchgeführt. Pry-out of composite dowels in cracked concrete - experimental investigation. Experimental investigations from the literature show that the shear capacity of composite dowels with pry-out failure is strongly affected by transverse concrete cracks. But so far, the internal load carrying mechanisms of composite dowels in cracked concrete are not clarified and existing shear capacity models do not account for concrete cracking. Hence, the present paper illustrates the results of 38 shear tests, providing novel insights regarding the pry-out failure of composite dowels in cracked concrete. The shear tests were performed in an innovative test setup allowing to investigate the impact of crack pattern (crack spacing) and crack width. Using the test results the present paper analyzes the occurrent load carrying mechanisms and illustrates the phenomenology of pry-out failure in cracked concrete. All investigations are part of [1].
Source:	Stahlbau 86 (2017), No. 3
Page/s:	256-268
Language of Publication:	German

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