Arch Flashcards

Triangular Arch

Reverse o Gee Arch

Ogee Arch

Lancet Arch

Rampant Round Arch

inflexed arch

Equilateral Pointed Arch

Segmental Arch
(less than the semi circle, remember “Parts of the circle, which are arc, segment and sector”

Parabolic Arch

Three Centered arch

horse shoe arch

Tudor Arch

Elliptical Arch

Shouldered Flat Arch

Tre Foiled Arch
A curved structure for spanning and opening, designed to support a vertical load primarily by axial compression.
Arch

An arch constructed of individual stone 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 wedge-shaped, often embellished voissor at the crown of an arch, serving to lock the other voussoirs in place.
Keystone
(Crown means top or highest level, remember crown in Pipe sections - Invert and Crown)

The exterior curve, surface or boundary of the visible face of an arch.
Extrados or Back

A decorative molding 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

The height of an arch from the spring line to the highest point of the intrados (sometimes at the bottom of the Keystone).
Rise
The point at which an arch, vault or dome rises from its support.
Spring or Springing

The first voussoir resting on the impost of an arch.
Springer

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.
Spandrel or Spandril

Any of several concentric rings of masonry forming an arch, especially when each projects beyond the one below.
Order
A crosspiece connecting the ribs in a centering.
Lag or Bolster
An archway having sides or jambs not at right angles with the face of its abutments.
Skew Arch
(tabingi yung isang dulo ng arch)

Skew
hindi parallel hindi din right angle, in short “Tabingi”
A temporary framework for supporting a masonry arch or vault during construction until the work can support itself.
Centering
A board used as centering for a flat arch, slightly crowned to allow for settling of the arch.
Camber Piece or 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
The median line of an arched structure.
Arch Axis
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.
Line of Thrust
Coincide
magtugma, mag sang ayon sa isat isa
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 pattern. As with any funicular structure, a funucular arch is subject to bending if the loading pattern changes.
- An inverted catenary is the funicular shape for an arch carrying a vertical load uniformly distributed along the length of the arch axis.*
- The parabola is the funicular shape for an arch carrying a vertical load uniformly distributed over its horizontal projection.*
Funicular Arch
The outward force or pressure exerted by one part of a structure against another.
Thrust
The thrust of an arched structure on its abutments, proportional to the total load and span, and inversely proportional to the rise.
Drift
An arch structure of timber, steel or reinforced concrete, constructed as a rigid body capable of carrying bending stresses.
Rigid Arch
A fixed frame structure having an arched form.
Fixed Arch

A two-hinged frame structure having an arched form.
Two Hinged arch

A three-hinged frame structure having an arched form.
Three-hinged arch

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

An iron or steel rod serving as a structural tie, specially one keeping the lower ends of an arch or frame from spreading.
Tie Rod
An arch having a horizontal intrados with voussors radiating from a center below, often building with a slight camber to allow for settling.
Flat Arch or jack arch
A flat arch having voussoirs inclined to the same angle on each side of the center.
French arch
A primitive form of arch consisting of two stones laid diagonally to support each other over an opening.
Triangular Arch
A false arch constructed by corbelling 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.
Corbel Arch
An arch having a continuously curved intrados especially a semicircular one.
Round arch
An arch having a semicircular intrados.
Roman Arch
An arch having one impost higher than the other.
Rampant arch
An arch resting on imposts trated as downward continuation of the archivolt.
Stilted Arch
A round arch resting on two large corbels with curved faces.
Bell Arch
An arch having an intrados that widens above the springing before narrowing to a rounded crown.
Moorish arch or Horseshoe Arch

An arch having a cusped intrados with three round or pointed foils.
Trefoil Arch
A three-centered arch having a crown with a radius much greater than that of the outer pair of curves.
Basket Handle Arch or Anse De Panier
An arch struck from one or more centers below the springing line.
Segmental Arch
A stone or course of masonry having a sloping face against which the end of a segmental arch rests.
Skewback
An arch having a pointed crown.
Pointed Arch
A pointed arch having two centers and radii equal to the span.
Equilateral arch
A pointed arch especially one having two centers and equal radii
Gothic Arch

A pointed arch having two centers and raii greater than the span.
Lancet Arch
A pointed arch having two centers and raii less than the span.
Drop Arch
A four-centered arch having an inner pair of curves with a radius much greater than that of the outer pair.
Tudor Arch
An arch having a rise of less than half the span.
Surbased Arch
A pointed arch, each haunch of which is a double curve with the concave side uppermost.
Ogee Arch