Editing Plate girder bridge (section)

==Deck-type plate girder bridge==
In the deck-type bridge, a wood, steel or [[reinforced concrete]] bridge deck is supported on top of two or more plate girders, and may act [[composite material|compositely]] with them.  In the case of railroad bridges, the [[railroad ties]] themselves may form the bridge deck, or the deck may support [[Track ballast|ballast]] on which the track is laid. Additional beams may connect the main girders, for example in the form of bridge known as '''ladder-deck''' construction. Also, further elements may be attached to provide cross-bracing and prevent the girders from [[buckling]].