BeamBeam may refer to:*Beam , a construction element*Beam , the most extreme width of a nautical vessel, or a point alongside the ship at the mid-point of its length*A narrow, propagating stream of particles or energy:...
bridgesA bridge is a structure built to span a valley, road, body of water, or other physical obstacle, for the purpose of providing passage over the obstacle. Designs of bridges vary depending on the function of the bridge and the nature of the terrain where the bridge is constructed.-History:The first...
are the simplest kind of bridge today. They are a direct descendant of the
log bridgeA log bridge is a bridge that uses logs that fall naturally or are intentionally felled or placed across streams. The first manmade bridges with significant span were probably intentionally felled trees. The use of emplaced logs is now sometimes used in temporary bridges used for logging roads,...
, now more commonly made from shallow steel
'I' beamsI-beams are beams with an
I- or H-shaped cross-section. The horizontal elements are flanges, while the vertical element is the web...
,
box girdersA box girder bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. The box is typically rectangular or trapezoidal in cross-section...
,
reinforced concreteReinforced concrete is concrete in which steel reinforcement bars , plates or fibers have been incorporated to strengthen a material that would otherwise be brittle.-History:...
, 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.
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BeamBeam may refer to:*Beam , a construction element*Beam , the most extreme width of a nautical vessel, or a point alongside the ship at the mid-point of its length*A narrow, propagating stream of particles or energy:...
bridgesA bridge is a structure built to span a valley, road, body of water, or other physical obstacle, for the purpose of providing passage over the obstacle. Designs of bridges vary depending on the function of the bridge and the nature of the terrain where the bridge is constructed.-History:The first...
are the simplest kind of bridge today. They are a direct descendant of the
log bridgeA log bridge is a bridge that uses logs that fall naturally or are intentionally felled or placed across streams. The first manmade bridges with significant span were probably intentionally felled trees. The use of emplaced logs is now sometimes used in temporary bridges used for logging roads,...
, now more commonly made from shallow steel
'I' beamsI-beams are beams with an
I- or H-shaped cross-section. The horizontal elements are flanges, while the vertical element is the web...
,
box girdersA box girder bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. The box is typically rectangular or trapezoidal in cross-section...
,
reinforced concreteReinforced concrete is concrete in which steel reinforcement bars , plates or fibers have been incorporated to strengthen a material that would otherwise be brittle.-History:...
, 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.