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A column or pillar in
architecture Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and constructing building ...
and
structural engineering Structural engineering is a sub-discipline of civil engineering in which structural engineers are trained to design the 'bones and muscles' that create the form and shape of man-made structures. Structural engineers also must understand and cal ...
is a structural element that transmits, through
compression Compression may refer to: Physical science *Compression (physics), size reduction due to forces *Compression member, a structural element such as a column *Compressibility, susceptibility to compression * Gas compression *Compression ratio, of a ...
, the weight of the structure above to other structural elements below. In other words, a column is a
compression member Compression members are structural elements that are pushed together or carry a load; more technically, they are subjected only to axial compressive forces. That is, the loads are applied on the longitudinal axis through the centroid of the mem ...
. The term ''column'' applies especially to a large round support (the shaft of the column) with a capital and a base or
pedestal A pedestal (from French ''piédestal'', Italian ''piedistallo'' 'foot of a stall') or plinth is a support at the bottom of a statue, vase, column, or certain altars. Smaller pedestals, especially if round in shape, may be called socles. In ...
, which is made of stone, or appearing to be so. A small wooden or metal support is typically called a ''
post Post or POST commonly refers to: *Mail, the postal system, especially in Commonwealth of Nations countries **An Post, the Irish national postal service **Canada Post, Canadian postal service **Deutsche Post, German postal service **Iraqi Post, Ira ...
''. Supports with a rectangular or other non-round section are usually called ''
piers Piers may refer to: * Pier, a raised structure over a body of water * Pier (architecture), an architectural support * Piers (name), a given name and surname (including lists of people with the name) * Piers baronets, two titles, in the baronetages ...
''. For the purpose of
wind Wind is the natural movement of air or other gases relative to a planet's surface. Winds occur on a range of scales, from thunderstorm flows lasting tens of minutes, to local breezes generated by heating of land surfaces and lasting a few ho ...
or earthquake engineering, columns may be designed to resist lateral forces. Other compression members are often termed "columns" because of the similar stress conditions. Columns are frequently used to support
beam Beam may refer to: Streams of particles or energy *Light beam, or beam of light, a directional projection of light energy **Laser beam *Particle beam, a stream of charged or neutral particles **Charged particle beam, a spatially localized grou ...
s or arches on which the upper parts of walls or ceilings rest. In architecture, "column" refers to such a structural element that also has certain proportional and decorative features. A column might also be a decorative element not needed for structural purposes; many columns are
engaged An engagement or betrothal is the period of time between the declaration of acceptance of a marriage proposal and the marriage itself (which is typically but not always commenced with a wedding). During this period, a couple is said to be ''fi ...
, that is to say form part of a wall. A long sequence of columns joined by an entablature is known as a
colonnade In classical architecture, a colonnade is a long sequence of columns joined by their entablature, often free-standing, or part of a building. Paired or multiple pairs of columns are normally employed in a colonnade which can be straight or cur ...
.


History


Antiquity

All significant
Iron Age The Iron Age is the final epoch of the three-age division of the prehistory and protohistory of humanity. It was preceded by the Stone Age ( Paleolithic, Mesolithic, Neolithic) and the Bronze Age ( Chalcolithic). The concept has been mostl ...
civilizations of the Near East and
Mediterranean The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western Europe, Western and Southern Europe and Anatolia, on the south by North Africa ...
made some use of columns.


Egyptian

In ancient Egyptian architecture as early as 2600 BC, the architect Imhotep made use of stone columns whose surface was carved to reflect the organic form of bundled reeds, like
papyrus Papyrus ( ) is a material similar to thick paper that was used in ancient times as a writing surface. It was made from the pith of the papyrus plant, '' Cyperus papyrus'', a wetland sedge. ''Papyrus'' (plural: ''papyri'') can also refer to a ...
, lotus and
palm Palm most commonly refers to: * Palm of the hand, the central region of the front of the hand * Palm plants, of family Arecaceae **List of Arecaceae genera * Several other plants known as "palm" Palm or Palms may also refer to: Music * Palm (ba ...
. In later Egyptian architecture faceted cylinders were also common. Their form is thought to derive from archaic reed-built shrines. Carved from stone, the columns were highly decorated with carved and painted
hieroglyphs A hieroglyph (Greek for "sacred carvings") was a character of the ancient Egyptian writing system. Logographic scripts that are pictographic in form in a way reminiscent of ancient Egyptian are also sometimes called "hieroglyphs". In Neoplatonis ...
, texts, ritual imagery and natural motifs. Egyptian columns are famously present in the Great Hypostyle Hall of Karnak (circa 1224 BC), where 134 columns are lined up in sixteen rows, with some columns reaching heights of 24 metres. One of the most important type are the papyriform columns. The origin of these columns goes back to the 5th Dynasty. They are composed of lotus (papyrus) stems which are drawn together into a bundle decorated with bands: the capital, instead of opening out into the shape of a bellflower, swells out and then narrows again like a flower in bud. The base, which tapers to take the shape of a half-sphere like the stem of the lotus, has a continuously recurring decoration of stipules. The grammar of ornament (1868) (14587326250).jpg, Illustration of papyriform capitals, in ''
The Grammar of Ornament Owen Jones (15 February 1809 – 19 April 1874) was a British architect. A versatile architect and designer, he was also one of the most influential design theorists of the nineteenth century. He helped pioneer modern colour theory, and his th ...
'' Lepsius-Projekt tw 1-2-108.jpg, Illustration of various types of capitals, drawn by the egyptologist Karl Richard Lepsius Mammisi Philae2.JPG, Columns with
Hathor Hathor ( egy, ḥwt-ḥr, lit=House of Horus, grc, Ἁθώρ , cop, ϩⲁⲑⲱⲣ, Meroitic: ) was a major goddess in ancient Egyptian religion who played a wide variety of roles. As a sky deity, she was the mother or consort of the sk ...
ic capitals The double row of columns with papyrus bundle capitals - The Court of Amonhotep III - Luxor Temple (14075179947).jpg, Papyriform columns of the
Luxor Temple The Luxor Temple ( ar, معبد الأقصر) is a large Ancient Egyptian temple complex located on the east bank of the Nile River in the city today known as Luxor (ancient Thebes) and was constructed approximately 1400 BCE. In the Egyptian lang ...


Greek and Roman

The Minoans used whole tree-trunks, usually turned upside down in order to prevent re-growth, stood on a base set in the stylobate (floor base) and topped by a simple round capital. These were then painted as in the most famous Minoan palace of
Knossos Knossos (also Cnossos, both pronounced ; grc, Κνωσός, Knōsós, ; Linear B: ''Ko-no-so'') is the largest Bronze Age archaeological site on Crete and has been called Europe's oldest city. Settled as early as the Neolithic period, the na ...
. The Minoans employed columns to create large open-plan spaces, light-wells and as a focal point for religious rituals. These traditions were continued by the later
Mycenaean civilization Mycenaean Greece (or the Mycenaean civilization) was the last phase of the Bronze Age in Ancient Greece, spanning the period from approximately 1750 to 1050 BC.. It represents the first advanced and distinctively Greek civilization in mainland ...
, particularly in the megaron or hall at the heart of their palaces. The importance of columns and their reference to palaces and therefore authority is evidenced in their use in heraldic motifs such as the famous lion-gate of
Mycenae Mycenae ( ; grc, Μυκῆναι or , ''Mykē̂nai'' or ''Mykḗnē'') is an archaeological site near Mykines in Argolis, north-eastern Peloponnese, Greece. It is located about south-west of Athens; north of Argos; and south of Corinth. ...
where two lions stand each side of a column. Being made of wood these early columns have not survived, but their stone bases have and through these we may see their use and arrangement in these palace buildings. The Egyptians, Persians and other civilizations mostly used columns for the practical purpose of holding up the roof inside a building, preferring outside walls to be decorated with
relief Relief is a sculptural method in which the sculpted pieces are bonded to a solid background of the same material. The term '' relief'' is from the Latin verb ''relevo'', to raise. To create a sculpture in relief is to give the impression that th ...
s or painting, but the Ancient Greeks, followed by the Romans, loved to use them on the outside as well, and the extensive use of columns on the interior and exterior of buildings is one of the most characteristic features of classical architecture, in buildings like the
Parthenon The Parthenon (; grc, Παρθενών, , ; ell, Παρθενώνας, , ) is a former temple on the Athenian Acropolis, Greece, that was dedicated to the goddess Athena during the fifth century BC. Its decorative sculptures are considere ...
. The Greeks developed the
classical orders An order in architecture is a certain assemblage of parts subject to uniform established proportions, regulated by the office that each part has to perform. Coming down to the present from Ancient Greek and Ancient Roman civilization, the arch ...
of architecture, which are most easily distinguished by the form of the column and its various elements. Their
Doric Doric may refer to: * Doric, of or relating to the Dorians of ancient Greece ** Doric Greek, the dialects of the Dorians * Doric order, a style of ancient Greek architecture * Doric mode, a synonym of Dorian mode * Doric dialect (Scotland) * Doric ...
, Ionic, and
Corinthian Corinthian or Corinthians may refer to: *Several Pauline epistles, books of the New Testament of the Bible: **First Epistle to the Corinthians **Second Epistle to the Corinthians **Third Epistle to the Corinthians (Orthodox) *A demonym relating to ...
orders were expanded by the Romans to include the Tuscan and
Composite Composite or compositing may refer to: Materials * Composite material, a material that is made from several different substances ** Metal matrix composite, composed of metal and other parts ** Cermet, a composite of ceramic and metallic materials ...
orders. Knossos 03.JPG, Minoan columns at the West Bastion of the Palace of
Knossos Knossos (also Cnossos, both pronounced ; grc, Κνωσός, Knōsós, ; Linear B: ''Ko-no-so'') is the largest Bronze Age archaeological site on Crete and has been called Europe's oldest city. Settled as early as the Neolithic period, the na ...
EB1911 Capital Fig. 5 Early Greek Capital from the Tomb of Agamemnon, Mycenae.jpg, Illustration of the end of a Mycenaean column, from the Tomb of Agamemnon Fotothek df tg 0001022 Architektur ^ Säule ^ dorische Ordnung ^ Brücke.jpg, Illustration of the
Tuscan order The Tuscan order (Latin ''Ordo Tuscanicus'' or ''Ordo Tuscanus'', with the meaning of Etruscan order) is one of the two classical orders developed by the Romans, the other being the composite order. It is influenced by the Doric order, but with ...
DoricParthenon.jpg, Illustration of the
Doric order The Doric order was one of the three orders of ancient Greek and later Roman architecture; the other two canonical orders were the Ionic and the Corinthian. The Doric is most easily recognized by the simple circular capitals at the top of c ...
Ionic order J.L.Leroy.jpg, Illustration of the Ionic order Evolution of the Corinthian Capital 138.jpg, Evolution of the Corinthian order Fotothek df tg 0001039 Architektur ^ Säule ^ komposite Ordnung.jpg, Illustration of the
Composite order The Composite order is a mixed order, combining the volutes of the Ionic order capital with the acanthus leaves of the Corinthian order.Henig, Martin (ed.), ''A Handbook of Roman Art'', p. 50, Phaidon, 1983, In many versions the composite or ...
Femme en priere entre deux colonnes ioniques - Louvre.jpg, Praying Woman between two ionic columns, 2nd century, marble, in the
Louvre The Louvre ( ), or the Louvre Museum ( ), is the world's most-visited museum, and an historic landmark in Paris, France. It is the home of some of the best-known works of art, including the ''Mona Lisa'' and the ''Venus de Milo''. A central l ...


Persian

Some of the most elaborate columns in the ancient world were those of the
Persia Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...
ns, especially the massive stone columns erected in
Persepolis , native_name_lang = , alternate_name = , image = Gate of All Nations, Persepolis.jpg , image_size = , alt = , caption = Ruins of the Gate of All Nations, Persepolis. , map = , map_type ...
. They included double-bull structures in their capitals. The Hall of Hundred Columns at Persepolis, measuring 70 × 70 metres, was built by the
Achaemenid The Achaemenid Empire or Achaemenian Empire (; peo, 𐎧𐏁𐏂, , ), also called the First Persian Empire, was an ancient Iranian empire founded by Cyrus the Great in 550 BC. Based in Western Asia, it was contemporarily the largest emp ...
king Darius I (524–486 BC). Many of the ancient
Persian column Persian columns or Persepolitan columns are the distinctive form of column developed in the Achaemenid architecture of ancient Persia, probably beginning shortly before 500 BCE. They are mainly known from Persepolis, where the massive main columns ...
s are standing, some being more than 30 metres tall. Tall columns with bull's head capitals were used for porticoes and to support the roofs of the hypostylehall, partly inspired by the ancient Egyptian precedent. Since the columns carried timber beams rather than stone, they could be taller, slimmer and more widely spaced than Egyptian ones.


Middle Ages

Columns, or at least large structural exterior ones, became much less significant in the architecture of the
Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire ...
. The classical forms were abandoned in both
Byzantine The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...
and
Romanesque architecture Romanesque architecture is an architectural style of medieval Europe characterized by semi-circular arches. There is no consensus for the beginning date of the Romanesque style, with proposals ranging from the 6th to the 11th century, this lat ...
in favour of more flexible forms, with capitals often using various types of foliage decoration, and in the West scenes with figures carved in
relief Relief is a sculptural method in which the sculpted pieces are bonded to a solid background of the same material. The term '' relief'' is from the Latin verb ''relevo'', to raise. To create a sculpture in relief is to give the impression that th ...
. During the Romanesque period, builders continued to reuse and imitate ancient Roman columns wherever possible; where new, the emphasis was on elegance and beauty, as illustrated by twisted columns. Often they were decorated with mosaics. SantApollinare Nuovo Pulpito marmoreo.jpg, Byzantine columns from
Basilica of Sant'Apollinare Nuovo The Basilica of Sant'Apollinare Nuovo is a basilica church in Ravenna, Italy. It was erected by the Ostrogothic king Theodoric the Great as his palace chapel during the first quarter of the 6th century (as attested to in the ''Liber Pontificalis ...
(
Ravenna Ravenna ( , , also ; rgn, Ravèna) is the capital city of the Province of Ravenna, in the Emilia-Romagna region of Northern Italy. It was the capital city of the Western Roman Empire from 408 until its collapse in 476. It then served as the ca ...
, Italy) Hagia_Sophia_(15468276434).jpg, The capital of a Byzantine column from
Hagia Sophia Hagia Sophia ( 'Holy Wisdom'; ; ; ), officially the Hagia Sophia Grand Mosque ( tr, Ayasofya-i Kebir Cami-i Şerifi), is a mosque and major cultural and historical site in Istanbul, Turkey. The cathedral was originally built as a Greek Ortho ...
(
Istanbul ) , postal_code_type = Postal code , postal_code = 34000 to 34990 , area_code = +90 212 (European side) +90 216 (Asian side) , registration_plate = 34 , blank_name_sec2 = GeoTLD , blank_i ...
, Turkey) Igreja de São Tiago, Coimbra. Capiteis y colunelos.jpg, Romanesque columns from the 12th century Neuwiller StPierre-Paul 117.JPG, Gothic columns of a church from
Neuwiller-lès-Saverne Neuwiller-lès-Saverne (, literally ''Neuwiller near Saverne''; german: Neuweiler; gsw-FR, Neiwiller) is a commune in the Bas-Rhin department in Grand Est in north-eastern France. Landmarks The handsome 1873 synagogue survived the war. See ...
(France) File:Gelnhausen, Marienkirche, Südportal-20160804-007.jpg, Slender Gothic columns at a portal of (
Gelnhausen Gelnhausen () is a town, and the capital of the Main-Kinzig-Kreis, in Hesse, Germany. It is located approximately 40 kilometers east of Frankfurt am Main, between the Vogelsberg mountains and the Spessart range at the river Kinzig. It is one o ...
, Germany) File:20131204_Istanbul_085.jpg, Column use is common in
Ottoman architecture Ottoman architecture is the architectural style that developed under the Ottoman Empire. It first emerged in northwestern Anatolia in the late 13th century and developed from earlier Seljuk Turkish architecture, with influences from Byzantine a ...
, an example in
Topkapı Palace The Topkapı Palace ( tr, Topkapı Sarayı; ota, طوپقپو سرايى, ṭopḳapu sarāyı, lit=cannon gate palace), or the Seraglio, is a large museum in the east of the Fatih district of Istanbul in Turkey. From the 1460s to the complet ...
(
Istanbul ) , postal_code_type = Postal code , postal_code = 34000 to 34990 , area_code = +90 212 (European side) +90 216 (Asian side) , registration_plate = 34 , blank_name_sec2 = GeoTLD , blank_i ...
, Turkey)


Renaissance and later styles

Renaissance architecture Renaissance architecture is the European architecture of the period between the early 15th and early 16th centuries in different regions, demonstrating a conscious revival and development of certain elements of Ancient Greece, ancient Greek and ...
was keen to revive the classical vocabulary and styles, and the informed use and variation of the classical orders remained fundamental to the training of architects throughout Baroque,
Rococo Rococo (, also ), less commonly Roccoco or Late Baroque, is an exceptionally ornamental and theatrical style of architecture, art and decoration which combines asymmetry, scrolling curves, gilding, white and pastel colours, sculpted moulding, ...
and
Neo-classical architecture Neoclassical architecture is an architectural style produced by the Neoclassical movement that began in the mid-18th century in Italy and France. It became one of the most prominent architectural styles in the Western world. The prevailing style ...
.


Structure

Early columns were constructed of stone, some out of a single piece of stone. Monolithic columns are among the heaviest stones used in architecture. Other stone columns are created out of multiple sections of stone, mortared or dry-fit together. In many classical sites, sectioned columns were carved with a centre hole or depression so that they could be pegged together, using stone or metal pins. The design of most classical columns incorporates
entasis In architecture, entasis is the application of a convex curve to a surface for aesthetic purposes. Its best-known use is in certain orders of Classical columns that curve slightly as their diameter is decreased from the bottom upward. It also may ...
(the inclusion of a slight outward curve in the sides) plus a reduction in diameter along the height of the column, so that the top is as little as 83% of the bottom diameter. This reduction mimics the parallax effects which the eye expects to see, and tends to make columns look taller and straighter than they are while entasis adds to that effect. There are flutes and fillets that run up the shaft of columns. The flute is the part of the column that is indented in with a semi circular shape. The fillet of the column is the part between each of the flutes on the Ionic order columns. The flute width changes on all tapered columns as it goes up the shaft and stays the same on all non tapered columns. This was done to the columns to add visual interest to them. The Ionic and the Corinthian are the only orders that have fillets and flutes. The Doric style has flutes but not fillets. Doric flutes are connected at a sharp point where the fillets are located on Ionic and Corinthian order columns.


Nomenclature

Most classical columns arise from a basis, or base, that rests on the
stylobate In classical Greek architecture, a stylobate ( el, στυλοβάτης) is the top step of the crepidoma, the stepped platform upon which colonnades of temple columns are placed (it is the floor of the temple). The platform was built on a level ...
, or
foundation Foundation may refer to: * Foundation (nonprofit), a type of charitable organization ** Foundation (United States law), a type of charitable organization in the U.S. ** Private foundation, a charitable organization that, while serving a good cause ...
, except for those of the
Doric order The Doric order was one of the three orders of ancient Greek and later Roman architecture; the other two canonical orders were the Ionic and the Corinthian. The Doric is most easily recognized by the simple circular capitals at the top of c ...
, which usually rest directly on the stylobate. The basis may consist of several elements, beginning with a wide, square slab known as a
plinth A pedestal (from French ''piédestal'', Italian ''piedistallo'' 'foot of a stall') or plinth is a support at the bottom of a statue, vase, column, or certain altars. Smaller pedestals, especially if round in shape, may be called socles. In ...
. The simplest bases consist of the plinth alone, sometimes separated from the column by a convex circular cushion known as a
torus In geometry, a torus (plural tori, colloquially donut or doughnut) is a surface of revolution generated by revolving a circle in three-dimensional space about an axis that is coplanar with the circle. If the axis of revolution does not tou ...
. More elaborate bases include two toruses, separated by a concave section or channel known as a scotia or trochilus. Scotiae could also occur in pairs, separated by a convex section called an
astragal An astragal is a moulding profile composed of a half-round surface surrounded by two flat planes ( fillets). An astragal is sometimes referred to as a miniature torus. It can be an architectural element used at the top or base of a column, b ...
, or bead, narrower than a torus. Sometimes these sections were accompanied by still narrower convex sections, known as annulets or fillets.
Hewson Clarke Hewson Clarke (1787 – 1845 or later) was an English author, known for historical works. In literary circles he became unpopular by satirising Lord Byron. Life Clarke was born in Maryport, Cumberland, and went to work for a Mr. Huntley, a chemis ...
and John Dougall, ''The Cabinet of Arts'', T. Kinnersley, London (1817), pp. 271, 272.
"Architectural Glossary", in ''The Universal Decorator'', Francis Benjamin Thompson, Ed., vol. III (1859). At the top of the shaft is a capital, upon which the roof or other architectural elements rest. In the case of Doric columns, the capital usually consists of a round, tapering cushion, or echinus, supporting a square slab, known as an abax or
abacus The abacus (''plural'' abaci or abacuses), also called a counting frame, is a calculating tool which has been used since ancient times. It was used in the ancient Near East, Europe, China, and Russia, centuries before the adoption of the Hi ...
.
Ionic capitals The Ionic order is one of the three canonic orders of classical architecture, the other two being the Doric and the Corinthian. There are two lesser orders: the Tuscan (a plainer Doric), and the rich variant of Corinthian called the composite o ...
feature a pair of
volute A volute is a spiral, scroll-like ornament that forms the basis of the Ionic order, found in the capital of the Ionic column. It was later incorporated into Corinthian order and Composite column capitals. Four are normally to be found on an Ion ...
s, or scrolls, while
Corinthian capitals The Corinthian order (Greek: Κορινθιακός ρυθμός, Latin: ''Ordo Corinthius'') is the last developed of the three principal classical orders of Ancient Greek architecture and Roman architecture. The other two are the Doric order w ...
are decorated with reliefs in the form of acanthus leaves. Either type of capital could be accompanied by the same moldings as the base. In the case of free-standing columns, the decorative elements atop the shaft are known as a finial. Modern columns may be constructed out of steel, poured or precast concrete, or brick, left bare or clad in an architectural covering, or veneer. Used to support an arch, an impost, or pier, is the topmost member of a column. The bottom-most part of the arch, called the springing, rests on the impost.


Equilibrium, instability, and loads

As the axial load on a perfectly straight slender column with elastic material properties is increased in magnitude, this ideal column passes through three states: stable equilibrium, neutral equilibrium, and instability. The straight column under load is in stable equilibrium if a lateral force, applied between the two ends of the column, produces a small lateral deflection which disappears and the column returns to its straight form when the lateral force is removed. If the column load is gradually increased, a condition is reached in which the straight form of equilibrium becomes so-called neutral equilibrium, and a small lateral force will produce a deflection that does not disappear and the column remains in this slightly bent form when the lateral force is removed. The load at which neutral equilibrium of a column is reached is called the critical or
buckling In structural engineering, buckling is the sudden change in shape ( deformation) of a structural component under load, such as the bowing of a column under compression or the wrinkling of a plate under shear. If a structure is subjected to a ...
load. The state of instability is reached when a slight increase of the column load causes uncontrollably growing lateral deflections leading to complete collapse. For an axially loaded straight column with any end support conditions, the equation of static equilibrium, in the form of a differential equation, can be solved for the deflected shape and critical load of the column. With hinged, fixed or free end support conditions the deflected shape in neutral equilibrium of an initially straight column with uniform cross section throughout its length always follows a partial or composite sinusoidal curve shape, and the critical load is given by f_\equiv\frac\qquad (1) where ''E'' =
elastic modulus An elastic modulus (also known as modulus of elasticity) is the unit of measurement of an object's or substance's resistance to being deformed elastically (i.e., non-permanently) when a stress is applied to it. The elastic modulus of an object is ...
of the material, ''Imin'' = the minimal moment of inertia of the cross section, and ''L'' = actual length of the column between its two end supports. A variant of (1) is given by f_\equiv\frac\qquad (2) where ''r'' =
radius In classical geometry, a radius ( : radii) of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the latin ''radius'', meaning ray but also the ...
of gyration of column cross-section which is equal to the square root of (I/A), ''K'' = ratio of the longest half sine wave to the actual column length, ''E''''t'' = tangent modulus at the stress ''F''cr, and ''KL'' = effective length (length of an equivalent hinged-hinged column). From Equation (2) it can be noted that the buckling strength of a column is inversely proportional to the square of its length. When the critical stress, ''F''cr (''F''cr =''P''cr/''A'', where ''A'' = cross-sectional area of the column), is greater than the proportional limit of the material, the column is experiencing inelastic buckling. Since at this stress the slope of the material's stress-strain curve, ''E''''t'' (called the
tangent modulus {{Use dmy dates, date=November 2017 In solid mechanics, the tangent modulus is the slope of the stress– strain curve at any specified stress or strain. Below the proportional limit (the limit of the linear elastic regime) the tangent modulus is eq ...
), is smaller than that below the proportional limit, the critical load at inelastic buckling is reduced. More complex formulas and procedures apply for such cases, but in its simplest form the critical buckling load formula is given as Equation (3), f_\equiv-\frac\left(\frac\right)\qquad (3) A column with a cross section that lacks symmetry may suffer torsional buckling (sudden twisting) before, or in combination with, lateral buckling. The presence of the twisting deformations renders both theoretical analyses and practical designs rather complex. Eccentricity of the load, or imperfections such as initial crookedness, decreases column strength. If the axial load on the column is not concentric, that is, its line of action is not precisely coincident with the centroidal axis of the column, the column is characterized as eccentrically loaded. The eccentricity of the load, or an initial curvature, subjects the column to immediate bending. The increased stresses due to the combined axial-plus-flexural stresses result in a reduced load-carrying ability. Column elements are considered to be massive if their smallest side dimension is equal to or more than 400 mm. Massive columns have the ability to increase in carrying strength over long time periods (even during periods of heavy load). Taking into account the fact, that possible structural loads may increase over time as well (and also the threat of progressive failure), massive columns have an advantage compared to non-massive ones.


Extensions

When a column is too long to be built or transported in one piece, it has to be extended or spliced at the construction site. A
reinforced concrete column A reinforced concrete column is a structural member designed to carry compressive loads, composed of concrete with an embedded steel frame to provide reinforcement. For design purposes, the columns are separated into two categories: short colum ...
is extended by having the steel reinforcing bars protrude a few inches or feet above the top of the concrete, then placing the next level of reinforcing bars to overlap, and pouring the concrete of the next level. A steel column is extended by welding or bolting splice plates on the flanges and webs or walls of the columns to provide a few inches or feet of load transfer from the upper to the lower column section. A timber column is usually extended by the use of a steel tube or wrapped-around sheet-metal plate bolted onto the two connecting timber sections.


Foundations

A column that carries the load down to a foundation must have means to transfer the load without overstressing the foundation material. Reinforced concrete and masonry columns are generally built directly on top of concrete foundations. When seated on a concrete foundation, a steel column must have a base plate to spread the load over a larger area, and thereby reduce the bearing pressure. The base plate is a thick, rectangular steel plate usually welded to the bottom end of the column.


Orders

The
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *'' Epistle to the Romans'', shortened to ''Romans'', a lette ...
author
Vitruvius Vitruvius (; c. 80–70 BC – after c. 15 BC) was a Roman architect and engineer during the 1st century BC, known for his multi-volume work entitled '' De architectura''. He originated the idea that all buildings should have three attribut ...
, relying on the writings (now lost) of
Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...
authors, tells us that the ancient
Greeks The Greeks or Hellenes (; el, Έλληνες, ''Éllines'' ) are an ethnic group and nation indigenous to the Eastern Mediterranean and the Black Sea regions, namely Greece, Cyprus, Albania, Italy, Turkey, Egypt, and, to a lesser extent, oth ...
believed that their Doric order developed from techniques for building in wood. The earlier smoothed tree-trunk was replaced by a stone cylinder.


Doric order

The
Doric order The Doric order was one of the three orders of ancient Greek and later Roman architecture; the other two canonical orders were the Ionic and the Corinthian. The Doric is most easily recognized by the simple circular capitals at the top of c ...
is the oldest and simplest of the classical orders. It is composed of a vertical
cylinder A cylinder (from ) has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an infin ...
that is wider at the bottom. It generally has neither a base nor a detailed capital. It is instead often topped with an inverted
frustum In geometry, a (from the Latin for "morsel"; plural: ''frusta'' or ''frustums'') is the portion of a solid (normally a pyramid or a cone) that lies between two parallel planes cutting this solid. In the case of a pyramid, the base faces are ...
of a shallow cone or a cylindrical band of carvings. It is often referred to as the masculine order because it is represented in the bottom level of the
Colosseum The Colosseum ( ; it, Colosseo ) is an oval amphitheatre in the centre of the city of Rome, Italy, just east of the Roman Forum. It is the largest ancient amphitheatre ever built, and is still the largest standing amphitheatre in the world t ...
and the
Parthenon The Parthenon (; grc, Παρθενών, , ; ell, Παρθενώνας, , ) is a former temple on the Athenian Acropolis, Greece, that was dedicated to the goddess Athena during the fifth century BC. Its decorative sculptures are considere ...
, and was therefore considered to be able to hold more weight. The height-to-thickness ratio is about 8:1. The shaft of a Doric Column is almost always
fluted Fluting may refer to: *Fluting (architecture) * Fluting (firearms) * Fluting (geology) * Fluting (glacial) *Fluting (paper) Arts, entertainment, and media *Fluting on the Hump ''Fluting on the Hump'' is the first album by avant-garde band Kin ...
. The Greek Doric, developed in the western Dorian region of Greece, is the heaviest and most massive of the orders. It rises from the
stylobate In classical Greek architecture, a stylobate ( el, στυλοβάτης) is the top step of the crepidoma, the stepped platform upon which colonnades of temple columns are placed (it is the floor of the temple). The platform was built on a level ...
without any base; it is from four to six times as tall as its diameter; it has twenty broad flutes; the capital consists simply of a banded necking swelling out into a smooth echinus, which carries a flat square abacus; the Doric entablature is also the heaviest, being about one-fourth the height column. The Greek Doric order was not used after c. 100 B.C. until its “rediscovery” in the mid-eighteenth century.


Tuscan order

The
Tuscan order The Tuscan order (Latin ''Ordo Tuscanicus'' or ''Ordo Tuscanus'', with the meaning of Etruscan order) is one of the two classical orders developed by the Romans, the other being the composite order. It is influenced by the Doric order, but with ...
, also known as Roman Doric, is also a simple design, the base and capital both being series of cylindrical disks of alternating diameter. The shaft is almost never fluted. The proportions vary, but are generally similar to Doric columns. Height to width ratio is about 7:1.


Ionic order

The Ionic column is considerably more complex than the Doric or Tuscan. It usually has a base and the shaft is often fluted (it has grooves carved up its length). The capital features a
volute A volute is a spiral, scroll-like ornament that forms the basis of the Ionic order, found in the capital of the Ionic column. It was later incorporated into Corinthian order and Composite column capitals. Four are normally to be found on an Ion ...
, an ornament shaped like a scroll, at the four corners. The height-to-thickness ratio is around 9:1. Due to the more refined proportions and scroll capitals, the Ionic column is sometimes associated with academic buildings. Ionic style columns were used on the second level of the Colosseum.


Corinthian order

The Corinthian order is named for the Greek
city-state A city-state is an independent sovereign city which serves as the center of political, economic, and cultural life over its contiguous territory. They have existed in many parts of the world since the dawn of history, including cities such as ...
of
Corinth Corinth ( ; el, Κόρινθος, Kórinthos, ) is the successor to an ancient city, and is a former municipality in Corinthia, Peloponnese (region), Peloponnese, which is located in south-central Greece. Since the 2011 local government refor ...
, to which it was connected in the period. However, according to the architectural historian
Vitruvius Vitruvius (; c. 80–70 BC – after c. 15 BC) was a Roman architect and engineer during the 1st century BC, known for his multi-volume work entitled '' De architectura''. He originated the idea that all buildings should have three attribut ...
, the column was created by the sculptor
Callimachus Callimachus (; ) was an ancient Greek poet, scholar and librarian who was active in Alexandria during the 3rd century BC. A representative of Ancient Greek literature of the Hellenistic period, he wrote over 800 literary works in a wide varie ...
, probably an
Athenian Athens ( ; el, Αθήνα, Athína ; grc, Ἀθῆναι, Athênai (pl.) ) is both the capital and largest city of Greece. With a population close to four million, it is also the seventh largest city in the European Union. Athens dominates ...
, who drew acanthus leaves growing around a votive basket. In fact, the oldest known Corinthian capital was found in
Bassae Bassae ( la, Bassae, grc, Βάσσαι - ''Bassai'', meaning "little vale in the rocks") is an archaeological site in Oichalia, a municipality in the northeastern part of Messenia, Greece. In classical antiquity, it was part of Arcadia. Bassae ...
, dated at 427 BC. It is sometimes called the feminine order because it is on the top level of the Colosseum and holding up the least weight, and also has the slenderest ratio of thickness to height. Height to width ratio is about 10:1.


Composite order

The
Composite order The Composite order is a mixed order, combining the volutes of the Ionic order capital with the acanthus leaves of the Corinthian order.Henig, Martin (ed.), ''A Handbook of Roman Art'', p. 50, Phaidon, 1983, In many versions the composite or ...
draws its name from the capital being a composite of the Ionic and Corinthian capitals. The acanthus of the Corinthian column already has a scroll-like element, so the distinction is sometimes subtle. Generally the Composite is similar to the Corinthian in proportion and employment, often in the upper tiers of
colonnade In classical architecture, a colonnade is a long sequence of columns joined by their entablature, often free-standing, or part of a building. Paired or multiple pairs of columns are normally employed in a colonnade which can be straight or cur ...
s. Height to width ratio is about 11:1 or 12:1.


Solomonic

A
Solomonic column The Solomonic column, also called Barley-sugar column, is a helical column, characterized by a spiraling twisting shaft like a corkscrew. It is not associated with a specific classical order, although most examples have Corinthian or Composite c ...
, sometimes called "
barley sugar Barley sugar (or barley sugar candy) is a traditional variety of boiled sweet (hard candy), often yellow or orange in colour, which is usually made with an extract of barley Barley (''Hordeum vulgare''), a member of the grass family, is a ma ...
", begins on a base and ends in a capital, which may be of any order, but the shaft twists in a tight spiral, producing a dramatic, serpentine effect of movement. Solomonic columns were developed in the ancient world, but remained rare there. A famous marble set, probably 2nd century, was brought to
Old St. Peter's Basilica Old St. Peter's Basilica was the building that stood, from the 4th to 16th centuries, where the new St. Peter's Basilica stands today in Vatican City. Construction of the basilica, built over the historical site of the Circus of Nero, began dur ...
by
Constantine I Constantine I ( , ; la, Flavius Valerius Constantinus, ; ; 27 February 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337, the first one to Constantine the Great and Christianity, convert to Christiani ...
, and placed round the saint's shrine, and was thus familiar throughout the Middle Ages, by which time they were thought to have been removed from the
Temple of Jerusalem The Temple in Jerusalem, or alternatively the Holy Temple (; , ), refers to the two now-destroyed religious structures that served as the central places of worship for Israelites and Jews on the modern-day Temple Mount in the Old City of Jerusa ...
.J. Ward-Perkins, "The shrine of St. Peter's and its twelve spiral columns" ''Journal of Roman Studies'' 42 (1952) p 21ff. The style was used in bronze by Bernini for his spectacular St. Peter's baldachin, actually a ciborium (which displaced Constantine's columns), and thereafter became very popular with Baroque and
Rococo Rococo (, also ), less commonly Roccoco or Late Baroque, is an exceptionally ornamental and theatrical style of architecture, art and decoration which combines asymmetry, scrolling curves, gilding, white and pastel colours, sculpted moulding, ...
church architects, above all in
Latin America Latin America or * french: Amérique Latine, link=no * ht, Amerik Latin, link=no * pt, América Latina, link=no, name=a, sometimes referred to as LatAm is a large cultural region in the Americas where Romance languages — languages derived f ...
, where they were very often used, especially on a small scale, as they are easy to produce in wood by turning on a lathe (hence also the style's popularity for spindles on furniture and stairs).


Caryatid

A Caryatid is a sculpted female figure serving as an architectural support taking the place of a column or a pillar supporting an entablature on her head. The
Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...
term literally means "maidens of Karyai", an ancient town of Peloponnese.


Engaged columns

In architecture, an engaged column is a column embedded in a wall and partly projecting from the surface of the wall, sometimes defined as semi or three-quarter detached. Engaged columns are rarely found in classical Greek architecture, and then only in exceptional cases, but in Roman architecture they exist in abundance, most commonly embedded in the
cella A cella (from Latin for small chamber) or naos (from the Greek ναός, "temple") is the inner chamber of an ancient Greek or Roman temple in classical antiquity. Its enclosure within walls has given rise to extended meanings, of a hermit's or ...
walls of pseudoperipteral buildings.


Pillar tombs

Pillar tomb A pillar tomb is a type of monumental grave wherein the central feature is a single, prominent Column, pillar or column, often made of stone. Overview A number of world cultures incorporated pillars into tomb structures. Examples of such edifices ...
s are monumental graves, which typically feature a single, prominent pillar or column, often made of stone. A number of world cultures incorporated pillars into tomb structures. In the
ancient Greek Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic p ...
colony of
Lycia Lycia ( Lycian: 𐊗𐊕𐊐𐊎𐊆𐊖 ''Trm̃mis''; el, Λυκία, ; tr, Likya) was a state or nationality that flourished in Anatolia from 15–14th centuries BC (as Lukka) to 546 BC. It bordered the Mediterranean Sea in what is ...
in
Anatolia Anatolia, tr, Anadolu Yarımadası), and the Anatolian plateau, also known as Asia Minor, is a large peninsula in Western Asia and the westernmost protrusion of the Asian continent. It constitutes the major part of modern-day Turkey. The ...
, one of these edifices is located at the tomb of
Xanthos Xanthos ( Lycian: 𐊀𐊕𐊑𐊏𐊀 ''Arñna'', el, Ξάνθος, Latin: ''Xanthus'', Turkish: ''Ksantos'') was an ancient major city near present-day Kınık, Antalya Province, Turkey. The remains of Xanthos lie on a hill on the left b ...
. In the town of
Hannassa Hannassa is a proto-Somali historic town in southern Somalia. History Built on a promontory, Hanassa contains ruins of houses with archways and courtyards. It also features sites with pillar tombs, including a rare octagonal tomb. Additionally ...
in southern
Somalia Somalia, , Osmanya script: 𐒈𐒝𐒑𐒛𐒐𐒘𐒕𐒖; ar, الصومال, aṣ-Ṣūmāl officially the Federal Republic of SomaliaThe ''Federal Republic of Somalia'' is the country's name per Article 1 of thProvisional Constituti ...
, ruins of houses with archways and
courtyard A courtyard or court is a circumscribed area, often surrounded by a building or complex, that is open to the sky. Courtyards are common elements in both Western and Eastern building patterns and have been used by both ancient and contemporary ...
s have also been found along with other pillar tombs, including a rare octagonal tomb.


Gallery

File:Decorated pillars. Mosque. Kashgar.jpg, Decorated pillars. Mosque. Kashgar File:Great Hypostyle Hall.jpg, The Great Hypostyle Hall from
Karnak The Karnak Temple Complex, commonly known as Karnak (, which was originally derived from ar, خورنق ''Khurnaq'' "fortified village"), comprises a vast mix of decayed temples, pylons, chapels, and other buildings near Luxor, Egypt. Constr ...
(Egypt) File:Columns of the Temple of Apollo at Delphi, Greece.jpeg, Columns found at the Temple of Apollo in Delphi File:Rocaille detail in a column - St. Peter - Mainz - Germany 2017.jpg,
Rococo Rococo (, also ), less commonly Roccoco or Late Baroque, is an exceptionally ornamental and theatrical style of architecture, art and decoration which combines asymmetry, scrolling curves, gilding, white and pastel colours, sculpted moulding, ...
detail of a column from St. Peter's Church (
Mainz Mainz () is the capital and largest city of Rhineland-Palatinate, Germany. Mainz is on the left bank of the Rhine, opposite to the place that the Main joins the Rhine. Downstream of the confluence, the Rhine flows to the north-west, with Ma ...
, Germany) File:Solomonic columns at St Peters Vatican (cropped).jpg, At right, two of the
Solomonic column The Solomonic column, also called Barley-sugar column, is a helical column, characterized by a spiraling twisting shaft like a corkscrew. It is not associated with a specific classical order, although most examples have Corinthian or Composite c ...
s brought to Rome by Constantine, in their present-day location on a pier in
St. Peter's Basilica The Papal Basilica of Saint Peter in the Vatican ( it, Basilica Papale di San Pietro in Vaticano), or simply Saint Peter's Basilica ( la, Basilica Sancti Petri), is a church built in the Renaissance style located in Vatican City, the papal e ...
(Rome). In the foreground at left is part of Bernini's Baldachin, inspired by the original columns. File:Colonne-p1040009.jpg, Ionic capital File:Western colonnade at courtyard, UVa 2004.jpg, Tuscan columns can be seen at the
University of Virginia The University of Virginia (UVA) is a public research university in Charlottesville, Virginia. Founded in 1819 by Thomas Jefferson, the university is ranked among the top academic institutions in the United States, with highly selective ad ...
File:San prospero colonne reggio emilia.jpg, Church of San Prospero ( Reggio Emilia,
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...
) File:Construction of Sigismund Column.JPG, Construction of
Sigismund's Column Sigismund's Column ( pl, Kolumna Zygmunta), originally erected in 1644, is located at Castle Square, Warsaw, Poland and is one of Warsaw's most famous landmarks as well as the first secular monument in the form of a column in modern history. The ...
in
Warsaw Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland, and its population is officia ...
, detail of the 1646 engraving. File:Columns in the inner court of the Bel Temple Palmyra Syria.JPG, These are composed of stacked segments and finished in the
Corinthian Corinthian or Corinthians may refer to: *Several Pauline epistles, books of the New Testament of the Bible: **First Epistle to the Corinthians **Second Epistle to the Corinthians **Third Epistle to the Corinthians (Orthodox) *A demonym relating to ...
style, at the
Temple of Bel The Temple of Bel ( ar, معبد بعل), sometimes also referred to as the "Temple of Baal", was an ancient temple located in Palmyra, Syria. The temple, consecrated to the Mesopotamian god Bel, worshipped at Palmyra in triad with the lunar g ...
(Syria) File:Bankstownreservoir.jpg, The pillars of
Bankstown Reservoir Bankstown Reservoir is a heritage-protected water tower and a local landmark situated in the suburb of Bankstown, Sydney, New South Wales, Australia. Located west of Sydney CBD, the reservoir is elevated and was built on reinforced concrete p ...
( Sydney, Australia) File:MosqueeKairouan 6bis.jpg, Reused
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *'' Epistle to the Romans'', shortened to ''Romans'', a lette ...
columns and capitals in the
Great Mosque of Kairouan The Great Mosque of Kairouan ( ar, جامع القيروان الأكبر), also known as the Mosque of Uqba (), is a mosque situated in the UNESCO World Heritage town of Kairouan, Tunisia and is one of the most impressive and largest Islamic mo ...
File:France-002353 - Square House (15866951852).jpg, Engaged columns embedded in the side walls of the
cella A cella (from Latin for small chamber) or naos (from the Greek ναός, "temple") is the inner chamber of an ancient Greek or Roman temple in classical antiquity. Its enclosure within walls has given rise to extended meanings, of a hermit's or ...
of the
Maison Carrée Maison (French for "house") may refer to: People * Edna Maison (1892–1946), American silent-film actress * Jérémy Maison (born 1993), French cyclist * Leonard Maison, New York state senator 1834–1837 * Nicolas Joseph Maison (1771–1840), Ma ...
in Nîmes (France)


See also

*
Huabiao Huabiao () is a type of ceremonial column used in traditional Chinese architecture. ''Huabiao'' are traditionally erected in pairs in front of palaces and tombs. The prominence of their placement have made them one of the emblems of traditional ...
*
Marian and Holy Trinity columns Marian columns are religious monuments depicting Virgin Mary on the top, often built in thanksgiving for the ending of a plague (plague columns) or for some other reason. The purpose of the Holy Trinity columns was usually simply to celebrate th ...
*
Spur (architecture) In architecture, a spur (French , German ) is the ornament carved on the angles of the base of early columns. Ornament A spur consists of a projecting claw, which, emerging from the lower torus of the base, rests on the projecting angle of the sq ...
*
Structural engineering Structural engineering is a sub-discipline of civil engineering in which structural engineers are trained to design the 'bones and muscles' that create the form and shape of man-made structures. Structural engineers also must understand and cal ...
*
Linga A lingam ( sa, लिङ्ग , lit. "sign, symbol or mark"), sometimes referred to as linga or Shiva linga, is an abstract or aniconic representation of the Hindu god Shiva in Shaivism. It is typically the primary ''murti'' or devotional ...
*
Lingodbhava Lingōdbhava ''(also called Lingobhava, the "emergence of the Linga")'' is an iconic representation of Hindu god Shiva, commonly seen in the South Indian Hindu temples. The icon depicts the legend of the origin of the linga, Shiva's iconic represe ...
* Our Lady of the Pillar * Columnar jointing (geology)


References

Chisholm, Hugh, ed. (1911). "Engaged Column". Encyclopædia Britannica. 9 (11th ed.). Cambridge University Press. pp. 404–405. Stierlin, Henri The Roman Empire: From the Etruscans to the Decline of the Roman Empire, TASCHEN, 2002 Alderman, Liz (7 July 2014). "Acropolis Maidens Glow Anew". The New York Times. Retrieved 9 July 2014. Stokstad, Marilyn; Cothren, Michael (2014). Art History (Volume 1 ed.). New Jersey: Pearson Education, Inc. p. 110.


External links

* {{Authority control Architectural elements Structural system Earthquake engineering