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Extrados

The outer exposed curve of an arch; defines the lower arc of a spandrel.

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Related terms

extrados
Construction; Bridge

The outer exposed curve of an arch; defines the lower arc of a spandrel.

extrados
Engineering; Civil engineering

The curved upstream surface of horizontal arch elements in an arch dam. See intrados.

extrados
Architecture; General architecture

The convex curve formed by the outer edge of an arch. The inner edge is called the intrados.

extrados
Mining; General mining; Mineral mining

The exterior arc of an arch, as in a tunnel.

extrados
Construction; Bridge

The convex curve of a masonry arch. The upper surface of the voussoirs when in position.

extrados
Construction; Masonry

A construction line denoting outer limit of the arch. It is used in the setting out.

cellular construction
Construction; Bridge

In early 20th century American suspension bridges, the method of constructing towers from relatively small welded steel box units.

beam bridge
Construction; Bridge

A bridge built of beams, either classified as a short-span or long-span beam bridge, which is supported on beams whose ends rest on piers or abutments.

welded joint
Construction; Bridge

A joint in which the assembled elements and members are united through fusion of metal.

footing
Construction; Bridge

The enlarged lower portion of the substructure or foundation that rests directly on the soil, bedrock or piles; usually below grade and not visible.

pre-tensioning
Construction; Bridge

The method of making prestressed concrete with steel strands under tension as the concrete sets.

flange
Construction; Bridge

The flat top and bottom plates of a box-girder.

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