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Ermüdung von Verbundkonstruktionen mit Verbunddübelleisten (lokales Tragverhalten)


Medium: journal article
Language(s): de 
Published in: Beton- und Stahlbetonbau, , n. 6, v. 110
Page(s): 382-393
DOI: 10.1002/best.201400121

Fatigue of composite constructions with composite dowels (local behavior)

Composite dowels are innovative shear connectors with great potential to benefit the construction of steel-concrete composite bridges with small and medium spans. Contrary to headed stud connectors, where initial steel cracks already occur after a few load cycles, the lifetime of composite dowels is predominately characterized by the compression of the multiaxial stressed concrete in front of the composite dowel, where shear forces are transferred between steel and concrete. Here, plastic concrete compression strains occur, that accumulate over the load cycles and lead to a cyclical increase of relative displacements in the composite connection. Certain proportions of these relative displacements remain constant in the connection, even after release of external loading. These permanent displacements are called inelastic slip. The initially rigid connection between steel and concrete degrades over the lifetime and rearrangements of internal forces between the composite partners occur, which may not be neglected in fatigue design. The present paper describes cyclic shear tests investigating the processes of cyclic slip increase. Here, the impacts of load-dependent parameters (upper load level and load range) onto the inelastic slip evolution are analyzed. Furthermore an engineering model is proposed, which can be used to consider cyclic slip increase in fatigue design.

composite construction composite dowels fatigue ver concrete fatigue cyclic shear tests inelastic slip multiaxial stress state cyclic dowel curve
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