Arch

Front 1

A curved structure for spanning an opening designed to support a vertical load primarily by axial compression.

Back 1

ARCH

Front 2

An arch constructed of individual stone or brick voissoirs.

Back 2

MASONRY ARCH

Front 3

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

Back 3

VOISSOIR

Front 4

The first voissoir restingo n the impost of an arch.

Back 4

SPRINGER

Hint 4

Front 5

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

Back 5

KEYSTONE

Hint 5

Front 6

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

Back 6

RISE

Hint 6

Front 7

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

Back 7

EXTRADOS

Hint 7

Front 8

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

Back 8

ARCHIVOLT

Hint 8

Front 9

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

Back 9

INTRADOS

Hint 9

Front 10

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

Back 10

SPRING

Hint 10

Front 11

The highest part or point of a corvex construction as an arcn, vault or roadway.

Back 11

CROWN

Hint 11

Front 12

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

Back 12

HAUNCH

Hint 12

Front 13

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

Back 13

IMPOST

Hint 13

Front 14

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 called Spandril.

Back 14

SPANDREL

Hint 14

Front 15

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

Back 15

SKEW ARCH

Hint 15

Front 16

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

Back 16

LAG

Hint 16

#2

Front 17

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

Back 17

ORDER

Hint 17

#1

Front 18

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

Back 18

CENTERING

Front 19

A board used as centering for a flat arch slightly crowned to allow for settling of the arch. Also called camber slip.

Back 19

CAMBER PIECE

Front 20

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 Ioading pattern. As with any funicular structure, this is subject to bending if the loading pattern changes.

Back 20

FUNICULAR ARCH

Front 21

The manner in wicn an arch transforms the vertlcaI forces of a supported load into inclined components and transmits them to abutments on either side of the archway.

Back 21

ARCH ACTION

Hint 21

#1

Front 22

The median line of an arched structure.

Back 22

ARCH AXIS

Hint 22

#2

Front 23

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, this must coincide with the arch axis.

Back 23

LINE OF THRUST

Hint 23

#3

Front 24

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

Back 24

THRUST

Hint 24

#1

Front 25

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

Back 25

DRIFT

Hint 25

#2

Front 26

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

Back 26

RIGID ARCH

Hint 26

#1

Front 27

A fixed frame structure having an arched form.

Back 27

FIXED ARCH

Hint 27

#2

Front 28

A two-hinged frame structure having an arched form.

Back 28

TWO-HINGED ARCH

Hint 28

#3

Front 29

A three-hinged frame structure having an arched form.

Back 29

THREE-HINGED ARCH

Hint 29

#4

Front 30

A part of a structure receiving and supportingthe thrust of an arch, vault or strut.

Back 30

ABUTMENT

Hint 30

#5

Front 31

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

Back 31

TIE ROD

Hint 31

#6

Front 32

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

Back 32

FLAT ARCH

Hint 32

Front 33

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

Back 33

FRENCH ARCH

Hint 33

Front 34

A primitive form of arch consisting of two stones laid diagonally to support each other over an opening.

Back 34

TRIANGULAR ARCH

Hint 34

Front 35

A false arch contructed 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.

Back 35

CORBEL ARCH

Hint 35

Front 36

An arch having a continuously curved intrados. esp. a semicircular one.

Back 36

ROUND ARCH

Hint 36

#1

Front 37

An arch having a semicircular intrados.

Back 37

ROMAN ARCH

Hint 37

Front 38

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

Back 38

SEGMENTAL ARCH

Hint 38

Front 39

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

Back 39

SKEWBACK

Hint 39

Front 40

An arch having one impost higher than the other.

Back 40

RAMPANT ARCH

Hint 40

Front 41

An arch resting on an impost treated as downward continuations of the archivolt.

Back 41

STILTED ARCH

Hint 41

Front 42

A round arch resting on two large corbels with curved faces.

Back 42

BELL ARCH

Hint 42

Front 43

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

Back 43

HORSESHOE ARCH

Hint 43

Front 44

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

Back 44

TREFOIL ARCH

Hint 44

Front 45

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.

Back 45

BASKET-HANDLE ARCH

Hint 45

Front 46

An arch having a pointed crown.

Back 46

POINTED ARCH

Hint 46

Front 47

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

Back 47

EQUILATERAL ARCH

Hint 47

Front 48

A pointed arch esp. one having two centers and equal radii.

Back 48

GOTHIC ARCH

Front 49

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

Back 49

LANCET ARCH

Hint 49

Front 50

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

Back 50

DROP ARCH

Hint 50

Front 51

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

Back 51

TUDOR ARCH

Hint 51

Front 52

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

Back 52

SURBASED ARCH

Hint 52

Front 53

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

Back 53

OGEE ARCH

Hint 53