Girder Bridges, including: Abernethy Bridge, Acosta Bridge, Box Girder Bridge, Cleddau Bridge, Sam Houston Ship Channel Bridge, North-south Expressway ... Dartmouth Bridge, Koror-babeldaob Bridge

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More info: A girder bridge, in general, is a bridge built of girders placed on bridge abutments and foundation piers. In turn, a bridge deck is built on top of the girders in order to carry traffic. There are several different subtypes of girder bridges: * A plate girder bridge is made out of (mostly) flat steel sections that are later welded or otherwise fabricated into an I-beam shape. Plate girders can have a greater height than rolled steel girders. Plate girder spans can be used for spans between 10 meters and more than 100 meters (33 feet to more than 330 feet). The web (vertical section) of a plate girder can be taller than that of a rolled steel girder, providing greater strength than a rolled steel girder. The thickness of the top and bottom flanges of a plate girder does not have to be constant; the thickness can be changed (typically at a field splice) to save on material costs. Stiffeners are occasionally welded between the compression flange and the web to increase the strength of the girder. * A box girder bridge is built from girders in a rectangular box shape instead of an I-beam shape.