An arch constructed of individual stone or brick voussoirs.

Any of the wedge-shaped units in a masonry arch or vault, having side cuts converging at one of the arch centers.

The first voussoir resting on the impost of an arch.

The height of an arch from the spring line to the highest point of the intrados.

The wedge-shaped, often embellished voussoir at the crown of an arch, serving to lock the other voussoirs in place.

The point at which an arch, vault, or dome rise from its support. Also, springing

The exterior curve, surface, or boundary of the visible face of an arch. Also called back.

A decorative molding or band on the face of an arch following the curve of the intrados.

The inner curve or surface of an arch forming the concave underside.

A crosspiece connecting the ribs in a centering. Also called bolster.

A board used as centering for a flat arch, slightly crowned to allow for setting of the arch.

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.

The highest part or point of a convex construction, such as an arch, vault, or roadway.

The uppermost part of an abutment, often in the form of a block, capital, or molding, from which an arch springs.

A temporary framework for supporting a masonry arch or vault during construction until the work can support itself

Any of several concentric rings of masonry forming an arch, esp, when each projects beyond the one below.

An archway having sides or jambes not at right angles with the face of its abutments

Either side of an arch curving down from the crown to the impost.

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.

The set of resultants of thrust and weight each part of an arch imposes on the next lower one. For bending to be eliminated throughout an arch, the line of thrust must coincide with the arch axis.

The median line of an arched structure.

An arch shaped to develop only axial compression under a given loading. This shape may be found by inverting the funicular shape for a cable carrying a similar loading patter As with any funicular structure, a funicular arch is subject to bending if the loading pattern changes.

The outward force or pressure exerted by one part of a structure against another.

The thrust of an arched structure on its abutments, proportional to the total load and span, and inversely proportional to the rise.

An arched structure of timber, steel, or reinforced concrete, constructed as a rigid body capable of carrying bending stresses.

A two-hinged frame structure having an arched form.

A fixed frame structure having an arched form.

A three-hinged frame structure having an arched form.

The part of a structure receiving and supporting the thrust of an arch, vault, or strut.

An iron or steel rod serving as a structural tie, esp. one keeping the lower ends of an arch or frame from spreading.

An arch having a horizontal intrados with voussoirs radiating from a center below often built with a slight camber to allow for settling. Also called jack arch.

A flat arch having voussoirs inclined to the same angle on each side of the center.

A pointed arch, each haunch of which is a double curve with the concave side uppermost

A pointed arch having two centers and radii less than the span.

An arch having a rise of less than half the span.

A pointed arch having two centers and radi greater than the span.

A pointed arch, esp. one having two centers and equal radi

A pointed arch having two centers and radii equal to the span.

A four centered arch having an inner pair of curves with a radius much greater than that of the outer pair.

An arch having a pointed crown.

A round arch resting on two large corbels with curved faces

An arch having an intrados that widens above the springing before narrowing to a rounded crown. Also called Moorish arch

An arch having a cusped intrados with three round or pointed foils.

A three-centered arch having a crown with a radius much greater than that of the outer pair of curves. Also called anse de panier.

A false arch constructed by corbeling courses from each side of an opening until they meet at a midpoint where a capstone is laid to complete the work. The stepped reveals may be smoothed, but no arch action is effected

An arch having one impost higher than the other

An arch resting on imposts treated as downward continuations of the archivolt

A stone or course of masonry having a sloping face against which the end of a segmental arch rests.

An arch having a continuously curved Intrados, esp. a semicircular one.

An arch struck from one or more centers below the springing line.

An arch having a semicircular Intrados