AT02 - Arch Flashcards
Learn architectural terms relating to Arch (62 cards)
A curved structure for spanning an opening, designed to support a vertical load primarily by axial compression.
ARCH
An arch constructed of individual stones or brick voussoirs.
MASONRY ARCH
Any of the wedge-shaped units in a masonry arch or vault, having side cuts converging at one of the arch centers.
VOUSSOIR
The first voussoir resting on the impost of an arch.
SPRINGER
The wedge-shaped, often embellished voussoir 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
The exterior curve, surface, or boundary of the visible face of an arch. Also called extrados.
BACK
A decorative molding or band on the face of an arch following the curve of the indrados.
ARCHIVOLT
The inner curve or surface of an arch forming the concave underside.
INTRADOS
The height of an arch from the spring line to the highest point of the intrados.
RISE
The point at which an arch, vault, or dome rises from its support. Also, springing.
SPRING
The point at which an arch, vault, or dome rises from its support. Also, spring.
SPRINGING
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 triangular-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 concentric 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
A crosspiece connecting the ribs in a centering. Also called lag.
BOLSTER
A temporary framework for supporting a masonry arch or vault during construction until the work can support itself.
CENTERING
An archway having sides or jambs not at right angles with the face of its abutments.
SKEW ARCH
A board used as centering for a flat arch, slightly crowned to allow for settling of the arch. Also called camber slip.
CAMBER PIECE
A board used as centering for a flat arch, slightly crowned to allow for settling of the arch. Also called camber piece.
CAMBER SLIP
The manner in which an arch transforms the vertical forces of a supported load into inclined components and transmits them to abutments on either side of the archway.
ARCH ACTION