Arch Flashcards
A curved structure for spanning an opening, designed to support a vertical load primarily by axial compression.
Arch
An arch constructed of individual stone or brick voussoirs.
Masonry Arch
The first voussoir resting on the impost of an arch.
Springer
The wedge-shaped, often embellished voussoirs at the crown of an arch, serving to lock the other voussoirs in place.
Keystone
The exterior curve, surface, or boundary of the visible face of an arch. Also called BACK.
Extrados
A decorative moulding or band on the face of an arch following the curve of the intrados.
Archivolt
The inner curve or surface of an arch forming the concave underside.
Intrados
Any of the wedge-shaped units in a masonry arch or vault, having side cuts converging at one of the arch centers.
Voussoir
The point at which an arch, vault, or dome rises from its support. Also , SPRINGING.
Spring
The highest part or point of a convex construction, such as an arch, vault, or roadway.
Crown
Either side of an arch curving down from the crown to the impost.
Haunch
The uppermost part of an abutment, often in the form of a block, capital, or molding, from which an arch springs.
Impost
The triangle-shaped, sometimes ornamented area between the extrados of two adjoining arches, or between the left or right extrados of an arch and the rectangular framework surrounding it. Also SPANDRIL.
Spandrel
Any of several concrete rings of masonry forming an arch, esp. when each projects beyond the one below.
Order
A crosspiece connecting the ribs in a centering. Also called BOLSTER.
Lag
