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Author(s):	Unterweger, Harald; Kampleitner, Andreas
Title:
Abstract:	Fachwerkträger im schweren Stahlbau weisen meist Druckdiagonalen mit geschweißten Kastenquerschnitten auf. Dabei sind in der Regel nur die seitlichen Gurtbleche direkt an die Fachwerkgurte angeschlossen, sodass hinsichtlich Biegeknicken aus der Fachwerkebene ein für einen Knickstab untypisches Tragverhalten vorliegt. Nach der Darstellung der untersuchten Anschlussdetails im Zuge einer begrenzten Parameteruntersuchung wird auf das spezielle Tragverhalten der Druckdiagonalen näher eingegangen. Es wird ein FEM-Modell vorgestellt, das es ermöglicht, die Druckdiagonale isoliert zu betrachten. Abschließend wird ein Ingenieurmodell dargestellt, das es erlaubt, ohne FEM-Berechnung die Drucktragfähigkeit der Diagonalstäbe zu bestimmen. Die Hintergründe des Ingenieurmodells sowie die Treffsicherheit gegenüber einer realitätsnahen 3D-Systemberechnung werden ebenfalls erläutert. Compression member capacity of truss diagonals with hollow section and joints with only flange connections Trusses for high loads often have diagonals with hollow sections and joints with only flange connections to the truss chords. Therefore, for buckling out of plane an untypical behaviour, compared to column buckling, is relevant. First the geometric details of the studied members and joints are presented. Then the typical load carrying behaviour of these diagonals in compression is shown. An equivalent member is suggested, to determine the compression member capacity of the diagonals. Finally, an engineering model for the design of the diagonals in compression is presented, which doesn't need a comprehensive FE-model calculation. The background of the model is shown and the accuracy for practical examples will be summed up.
Source:	Stahlbau 88 (2019), No. 5
Page/s:	414-427
Language of Publication:	German

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