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Author(s):	Gajda, Joanna; Kurz, Wolfgang
Title:
Abstract:	Verbundkonstruktionen aus Stahl und Beton haben sich in den letzten Jahrzehnten zu einer wirtschaftlichen und konkurrenzfähigen Bauweise im Hoch- und Brückenbau entwickelt. An die innovativen Verbundmittel wie Betondübel werden aufgrund der neuen Entwicklungen der Konstruktionen hohe Anforderungen hinsichtlich der Tragfähigkeit und der Verformbarkeit gestellt. Die Verbundmittel werden in immer schlankeren Konstruktionen eingesetzt. Die Betondübel in der Nähe des Plattenrandes können, ähnlich wie die liegenden Kopfbolzendübel, bei Einleitung der Längsschubkräfte versagensrelevante Spaltzugspannungen in Plattendickenrichtung erzeugen. Dieser Versagensmechanismus für Betondübel mit geringer Betondeckung senkrecht zur Verbundmittelachse wurde bislang in den Bemessungsmodellen nicht explizit berücksichtigt. Erste Versuche zur Bestimmung der Trag- und Verformungsfähigkeit randnaher Betondübel in Abscher- und Ausziehversuchen wurden durchgeführt. Relevante Parameter, die Einfluss auf das Trag- und Verformungsverhalten bei randnahen Betondübeln haben, werden anhand der Versuche diskutiert. Load bearing behavior of concrete dowels in a location close to a free surface under longitudinal shear stress. Over the last decades, composite structures made of steel and concrete have been developed in order to allow for the economic and competitive construction of buildings and bridges. Due to the new developments of innovative shear connectors such as concrete dowels, high requirements are expected for the load-bearing capacity and the ductility. The shear connectors are often used in slender structures. Concrete dowel close to a free concrete surface of a slab introduce longitudinal shear forces, which cause failure- relevant splitting stresses in direction of the slab thickness, similar to the horizontal lying headed studs. This failure mechanism of concrete dowels with a low concrete cover perpendicular to the central axis of the shear connectors has not been explicitly considered in the structural design models. First experiments in order to investigate the load-bearing capacity and the ductility of concrete dowels in a location close to a free surface in shear and pull-out tests were carried out. Some relevant parameters that have influence on the load-deformation behavior of concrete dowels located closely to the surface are discussed with reference to the experiments.
Source:	Stahlbau 82 (2013), No. 9
Page/s:	636-642
Language of Publication:	German

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