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An extradosed bridge employs a structure that combines the main elements of both a prestressed box girder bridge and a cable-stayed bridge. [1] [2]: 85 [3] The name comes from the word extrados, the exterior or upper curve of an arch, and refers to how the "stay cables" on an extradosed bridge are not considered as such in the design, but are instead treated as external prestressing tendons ...
The deck is raised on posts above the main cables. Stressed ribbon bridge: a modern descendant of the simple suspension bridge. The deck lies on the main cables, but is stiff, not flexible. Suspension bridge (more precisely, suspended-deck suspension bridge): the most familiar type. Though technically all the types listed here are suspension ...
The deck is a 2.4 m depth tri-cellular concrete box girder and it is suspended by the cable-stays spaced at 12 m. The deck is internally post-tensioned with longitudinal and transverse tendons. The 50 m high central tower is a reinforced concrete tower with a rectangular cross section and variable width in both directions.
Øresund Bridge from Malmö to Copenhagen in Sweden and Denmark. A cable-stayed bridge has one or more towers (or pylons), from which cables support the bridge deck. A distinctive feature are the cables or stays, which run directly from the tower to the deck, normally forming a fan-like pattern or a series of parallel lines.
When supporting the deck, the cables will instead form a parabola, assuming the weight of the cables is small compared to the weight of the deck. One can see the shape from the constant increase of the gradient of the cable with linear (deck) distance, this increase in gradient at each connection with the deck providing a net upward support force.
The definition of cable-stayed bridge deck length used here is: A continuous part of the bridge deck that is supported only by stay-cables and pylons, or are free spans. This means that columns supporting the side span as for example found in Pont de Normandie , excludes most of the side span decks from the cable-stayed deck length.
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