Beam bridge

Beams bridge
This footbridge was made from beams and boards obtained from logs from the surrounding forest.
Ancestor:	Log bridge
Related:	None
Descendant:	Box girder bridge, Plate girder bridge, trestle, truss bridge, moon bridge
Carries:	Pedestrians, automobiles, trucks, light rail, heavy rail
Span range:	Short
Material:	Timber, iron, steel, reinforced concrete, prestressed concrete
Movable:	No
Design effort:	Low
Falsework required:	No, unless cast-in place reinforced concrete is used
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Beam bridges are the simplest kind of bridge today. They are a direct descendant of the log bridge, now more commonly made from shallow steel 'I' beams, box girders, reinforced concrete, or post-tensioned concrete. It is frequently used in pedestrian bridges and for highway overpasses and flyovers. As is its ancestor, this bridge is in structural terms the simplest of the many bridge types.

Like most bridges that are characterized by how they are supported, beam bridges consist of one horizontal beam with 2 supports usually on either end.

Decorative beam bridges, commonly built from cedar, pine, and redwood, can span a koi pond or country creek. These free standing bridges are usually built as functional walkways or just for decoration.

Beam bridges are usually poles supporting a beam or board.

A steel pedestrian footbridge over a busy road in Swansea, typical of many beam bridges (the superstructure supports only the fence, not the bridge).

BP Pedestrian Bridge is a concealed box girder beam bridge in Millennium Park with sculptural qualities.

External links

Wikimedia Commons has media related to: Beam bridges

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