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Author(s):	Schlaich, Mike; El Shenawy, El Araby
Title:
Abstract:	Extradosed Brücken, von relativ flachen Seilen getragene steife Trägerbrücken, sind im Spannweitenbereich zwischen 100 und 200 m eine wirtschaftliche Alternative zu Betonhohlkastenträgern einerseits und Schrägseilbrücken anderseits. Während die Seilkräfte von Schrägseilbrücken mit schlankem Stahlbetonüberbau in der Regel so eingestellt werden, dass sie fast die ganzen ständigen Lasten tragen und der Überbau sich dann wie ein Durchlaufträger auf starren Stützen verhält, müssen Extradosed Brücken mit ihrem schweren und steifen Überbau anders behandelt werden. In diesem Artikel werden die typischen Eigenschaften der Extradosed Brücken beschrieben und gezeigt, wie deren Seilkräfte und der Verlauf der Biegemomente im Überbau unter ständigen Lasten einfach und wirtschaftlich eingestellt werden können. Auch die zusätzliche Anordnung von Spanngliedern im Überbau zur weiteren Reduktion dieser Momente im Brückenträger wird behandelt. Extradosed bridges Extradosed bridges with their flat/shallow stay cables and stiff decks are an economic alternative to box girder bridges and cable-stayed bridges for spans of 100 to 200 m. The structural system of extradosed bridges is considered also as a transition between the structural systems of the box girder bridges and the cable-stayed bridges. The stay cables for extradosed bridges are normally designed to carry nearly the full permanent load and the deck behaves as a continuous beam on rigid supports. The method, used usually for the determination of the stay cable forces under permanent load for cables-stayed bridges, cannot be followed for the extradosed bridges with their heavy and stiff decks. The typical configurations for such type of bridges will be presented in this paper. Further, a simple and an economic method for the determination of the stay cable forces and the corresponding bending moment distribution along the deck elements under permanent load, for extradosed bridges, will be proposed. Additionally, the arrangement of the prestressing tendons inside the concrete deck elements, to nearly eliminate the bending moments under permanent load, will be consistently handled.
Source:	Bautechnik 90 (2013), No. 7
Page/s:	410-420
Language of Publication:	German

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