Arch - wikipedia Arch This article is about the architectural construct. For other uses of arch or arches, see Arch ( disambiguation ). A masonry arch 1. Keystone 2. Voussoir 3. Extrados 4. Impost 5. Intrados 6. Rise 7. Clear span 8. Abutment An arch is a curved structure that spans an elevated space and may or may not support the weight above it. Arches may be synonymous with vaults, but a vault may be distinguished as a continuous arch forming a roof. Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture, and their systematic use started with the ancient Romans, who were the first to apply the technique to a wide range of structures. Contents 1 Basic concepts 1.1 Fixed vs hinged arch 1.2 Types of arches 2 History 3 Construction 4 Other types 5 Gallery 6 See also 7 References 8 Further reading 9 External links Basic concepts An arch is a soft compression form. It can span a large area by resolving forces into compressive stresses and, in turn eliminating tensile stresses. This is sometimes referred to as arch action. As the forces in the arch are carried to the ground, the arch will push outward at the base, called thrust. As the rise, or height of the arch decreases, the outward thrust increases. In order to maintain arch action and prevent the arch from collapsing, the thrust needs to be restrained, either with internal ties or external bracing, such as abutments. Fixed vs hinged arch Rossgraben bridge ( Rüeggisberg ) near Bern, Switzerland, showing the hinge at mid-span of this three - hinged arch. The most common true arch configurations are the fixed arch, the two - hinged arch, and the three - hinged arch. The fixed arch is most often used in reinforced concrete bridge and tunnel construction, where the spans are short. Because it is subject to additional internal stress caused by thermal expansion and contraction, this type of arch is considered to be statically indeterminate. The two - hinged arch is most often used to bridge long spans. This type of arch has pinned connections at the base. Unlike the fixed arch, the pinned base is able to rotate, allowing the structure to move freely and compensate for the thermal expansion and contraction caused by changes in outdoor temperature. However, this can result in additional stresses, so the two - hinged arch is also statically indeterminate, although not to the degree of the fixed arch. The three - hinged arch is not only hinged at its base, like the two - hinged arch, but at the mid-span as well. The additional connection at the mid-span allows the three - hinged arch to move in two opposite directions and compensate for any expansion and contraction. This type of arch is thus not subject to additional stress caused by thermal change. The three - hinged arch is therefore said to be statically determinate. It is most often used for medium - span structures, such as large building roofs. Another advantage of the three - hinged arch is that the pinned bases are more easily developed than fixed ones, allowing for shallow, bearing - type foundations in medium - span structures. In the three - hinged arch, `` thermal expansion and contraction of the arch will cause vertical movements at the peak pin joint but will have no appreciable effect on the bases, '' further simplifying the foundation design. Types of arches Arches have many forms, but all fall into three basic categories : circular, pointed, and parabolic. Arches can also be configured to produce vaults and arcades. Arches with a circular form, also referred to as rounded arches, were commonly employed by the builders of ancient, heavy masonry arches. Ancient Roman builders relied heavily on the rounded arch to span large, open areas. Several rounded arches placed in - line, end - to - end, form an arcade, such as the Roman aqueduct. Semi-circular arches using brick and / or stone block construction at the Great Wall, China Roman aqueduct near Nîmes, France : an arcade, employing the circular arch Horseshoe arches in the 9th - century Mosque of Uqba, in Kairouan, Tunisia Pointed arches were most often used by builders of Gothic - style architecture. The advantage to using a pointed arch, rather than a circular one, is that the arch action produces less thrust at the base. This innovation allowed for taller and more closely spaced openings, typical of Gothic architecture. Cathedral of St. Michael and St. Gudula in Brussels, Belgium, with a central pointed arch window, typical of Gothic architecture Vaults are essentially `` adjacent arches ( that ) are assembled side by side. '' If vaults intersect, complex forms are produced with the intersections. The forms, along with the `` strongly expressed ribs at the vault intersections, were dominant architectural features of Gothic cathedrals. '' Interior vaulted ceiling of Notre Dame de Paris, showing the ribs at the intersection of several arches The parabolic arch employs the principle that when weight is uniformly applied to an arch, the internal compression resulting from that weight will follow a parabolic profile. Of all arch types, the parabolic arch produces the most thrust at the base, but can span the largest areas. It is commonly used in bridge design, where long spans are needed. Tyne Bridge in Newcastle upon Tyne, England : a parabolic arch used in bridge design A series of parabolic arches on the Móra d'Ebre bridge, Catalonia The catenary arch has a shape different from the parabolic curve. The shape of the curve traced by a loose span of chain or rope, the catenary is the structurally ideal shape for a freestanding arch of constant thickness. Types of arches displayed chronologically, roughly in the order in which they were developed : Triangular arch Round arch, or semi-circular arch Segmental arch is less than a semicircle Unequal round arch, or rampant round arch Lancet arch Equilateral pointed arch Shouldered flat arch ( see also : jack arch ) Trefoil arch, or three - foiled cusped arch Horseshoe arch Three - centered arch Elliptical arch Inflexed arch Ogee arch Reverse ogee arch Tudor arch Parabolic arch History True arches, as opposed to corbel arches, were known by a number of civilizations in the ancient Near East and the Levant, but their use was infrequent and mostly confined to underground structures, such as drains where the problem of lateral thrust is greatly diminished. A rare exception is the Bronze Age arched Canaanite city gate of Ashkelon in modern - day Israel, dating to c. 1850 B.C. An early example of a voussoir arch appears in the Greek Rhodes Footbridge. Corbel arches were found in other parts of ancient Asia, Africa, Europe and the Americas. In 2010, a robot discovered a long arch - roofed passageway underneath the Pyramid of Quetzalcoatl, which stands in the ancient city of Teotihuacan north of Mexico City, dated to around 200 AD. In ancient Persia, the Achaemenid Empire built small barrel vaults ( essentially a series of arches built together to form a hall ) known as iwan, which became massive, monumental structures during the later Parthian Empire. This architectural tradition was continued by the Sasanian Empire, which built the Taq Kasra at Ctesiphon in the 6th century, the largest free - standing vault until modern times. The ancient Romans learned the arch from the Etruscans, refined it and were the first builders to tap its full potential for above ground buildings : The Romans were the first builders in Europe, perhaps the first in the world, fully to appreciate the advantages of the arch, the vault and the dome. Throughout the Roman empire, their engineers erected arch structures such as bridges, aqueducts, and gates. They also introduced the triumphal arch as a military monument. Vaults began to be used for roofing large interior spaces such as halls and temples, a function that was also assumed by domed structures from the 1st century BC onwards. The segmental arch was first built by the Romans who realized that an arch in a bridge did not have to be a semicircle, such as in Alconétar Bridge or Ponte San Lorenzo. They were also routinely used in house construction, as in Ostia Antica ( see picture ). In ancient China, most architecture was wooden, including the few known arch bridges from literature and one artistic depiction in stone - carved relief. Therefore, the only surviving examples of architecture from the Han Dynasty ( 202 BC -- 220 AD ) are rammed earth defensive walls and towers, ceramic roof tiles from no longer existent wooden buildings, stone gate towers, and underground brick tombs that, although featuring vaults, domes, and archways, were built with the support of the earth and were not free - standing. China 's oldest surviving stone arch bridge is the Anji Bridge, built between 595 and 605 during the Sui Dynasty ; it is the oldest open - spandrel segmental arch bridge in stone. However, the ancient Romans had virtually all of these components beforehand ; for example, Trajan 's Bridge had open spandrels built in wood on stone pillars. Arch of Caracalla at Theveste The first example of an early Gothic arch in Europe is in Sicily in the Greek fortifications of Gela. The semicircular arch was followed in Europe by the pointed Gothic arch or ogive, whose centreline more closely follows the forces of compression and which is therefore stronger. The semicircular arch can be flattened to make an elliptical arch, as in the Ponte Santa Trinita. Parabolic arches were introduced in construction by the Spanish architect Antoni Gaudí, who admired the structural system of the Gothic style, but for the buttresses, which he termed `` architectural crutches ''. The first examples of the pointed arch in the European architecture are in Sicily and date back to the Arab - Norman period. The horseshoe arch is based on the semicircular arch, but its lower ends are extended further round the circle until they start to converge. The first known built horseshoe arches are from the Kingdom of Aksum in modern - day Ethiopia and Eritrea, dating from ca. 3rd -- 4th century. This is around the same time as the earliest contemporary examples in Roman Syria, suggesting either an Aksumite or Syrian origin for the type. In India, Bhitargaon temple ( 450 AD ) and Mahabodhi temple ( 7th century AD ) built in by Gupta Dynasty are the earliest surviving examples of the use of voussoir arch vault system in India. The earlier uses semicircular arch, while the later contains examples of both gothic style pointed arch and semicircular arches. Although introduced in the 5th century, arches did n't gain prominence in the indian architecture until 12th century after Islamic conquest. The Gupta era arch vault system was later used extensively in Burmese Buddhist temples in Pyu and Bagan in 11th and 12th centuries.. Construction Since it is a pure compression form, the arch is useful because many building materials, including stone and unreinforced concrete, can resist compression, but are weak when tensile stress is applied to them. An arch is held in place by the weight of all of its members, making construction problematic. One answer is to build a frame ( historically, of wood ) which exactly follows the form of the underside of the arch. This is known as a centre or centring. Voussoirs are laid on it until the arch is complete and self - supporting. For an arch higher than head height, scaffolding would be required, so it could be combined with the arch support. Arches may fall when the frame is removed if design or construction has been faulty. The first attempt at the A85 bridge at Dalmally, Scotland suffered this fate, in the 1940s. The interior and lower line or curve of an arch is known as the intrados. Old arches sometimes need reinforcement due to decay of the keystones, forming what is known as bald arch. In reinforced concrete construction, the principle of the arch is used so as to benefit from the concrete 's strength in resisting compressive stress. Where any other form of stress is raised, such as tensile or torsional stress, it has to be resisted by carefully placed reinforcement rods or fibres. Other types Delicate Arch, a natural arch in Arches National Park near Moab, Utah A rock balance sculpture in the form of an arch A blind arch is an arch infilled with solid construction so it can not function as a window, door, or passageway. A special form of the arch is the triumphal arch, usually built to celebrate a victory in war. A famous example is the Arc de Triomphe in Paris, France. Rock formations may form natural arches through erosion, rather than being carved or constructed. Structures such as this can be found in Arches National Park. Some rock balance sculptures are in the form of an arch. The arches of the foot support the weight of the human body. Gallery Restored Canaanite city gate of Ashkelon, Ashkelon, Israel ( 2014 ) Reconstructed Ishtar Gate of Babylon in the Pergamon Museum, Berlin ( 2014 ) Taq Kasra ( Archway of Ctesiphon ), Salman Pak, Iraq ( 1864 ) Arch of Augustus, Rimini, Emilia - Romagna, Italy ( 2015 ) Arch of Gallienus, Rome ( 2006 ) Arch of Hadrian, Athens, Greece ( 2013 ) Arch of Constantine, Rome, commemorating a victory by Constantine I in 312 AD ( 2007 ) The Arc de Triomphe, Paris ; a 19th - century triumphal arch modelled on the classical Roman design ( 1998 ) Washington Square Arch, Greenwich Village, Manhattan, New York City ( 2010 ) Soldiers ' and Sailors ' Arch in the Grand Army Plaza, Brooklyn, New York City ( 2007 ) Gateway Arch in St. Louis, Missouri ; a sculpture based on a catenary arch ( 2011 ) Pont Flavien over the River Touloubre in Saint - Chamas, Bouches - du - Rhône, France ( 2008 ) Bridge of Seonamsa Temple, Suncheon, South Jeolla Province, South Korea ( 1979 ) Grosvenor Bridge over the River Dee in Chester, Cheshire, England, UK ( 2007 ) Union Arch Bridge carrying the Washington Aqueduct and MacArthur Boulevard ( formerly named Conduit Road ) in Cabin John, Montgomery County, Maryland ( 2008 ) Anji Bridge over the Xiaohe River, Hebei Province, China ( 2007 ) The dry stone bridge, so called Porta Rosa ( 4th century BC ), in Elea, Province of Salerno, Campania, Italy ( 2005 ) Bridge of Sighs, Venice, Italy ( 2001 ) Pont du Gard, a Roman aqueduct in Vers - Pont - du - Gard, Gard, France ( 2014 ) Bridge in Český Krumlov, Czech Republic ( 2004 ) Rialto Bridge over the Grand Canal in Venice, Italy ( 2011 ) Pont de Bercy over the River Seine, Paris, carrying the Paris Métro on its upper deck and a boulevard extension on its lower deck ( 2006 ) Arlington Memorial Bridge over the Potomac River in Washington, D.C. ( 2007 ) Francis Scott Key Bridge over the Potomac River in Washington, D.C. ( 2006 ) Woodrow Wilson Memorial Bridge carrying Interstate 95 ( I - 95 ) and the Capital Beltway over the Potomac River between Alexandria, Virginia and Oxon Hill, Maryland ( 2007 ) Rainbow Bridge over the Niagara River connecting Niagara Falls, New York and Niagara Falls, Ontario, Canada ( 2012 ) Tyne Bridge over the River Tyne, Newcastle upon Tyne, England, UK ( 2004 ) Hell Gate Bridge over the East River, New York City Sydney Harbour Bridge, Sydney, New South Wales, Australia ( 2010 ) Ludendorff Bridge over the Rhine River, Remagen, Germany, showing damage before collapse during the Battle of Remagen in World War II ( 1945 ) Lianxiang bridge over the Xiang River, Xiangtan, Hunan Province, China ( 2007 ) Zhivopisny Bridge over the Moskva River, Moscow, Russia ( 2009 ) Margaret Hunt Hill Bridge over the Trinity River in Dallas, Texas ( 2012 ) Juscelino Kubitschek Bridge crossing Paranoá Lake, Brasília, Brazil ( 2007 ) Gateshead Millennium Bridge over the River Tyne, Newcastle upon Tyne, England, UK ( 2005 ) Eiffel Tower, Paris ( 2009 ) Arch supporting the Eiffel Tower, Paris ( 2015 ) The second Wembley Stadium in London, built in 2007 ( 2007 ) The first San Mamés Stadium, in Bilbao, arch built in 1953, demolished 2013 ( 2013 ) St Pancras railway station, London ( 2011 ) Train shed in St Pancras railway station, London ( 2010 ) Train shed in Victoria Station, London ( 2006 ) Lucerne railway station, Switzerland ( 2010 ) Train shed in Lucerne railway station, Switzerland ( 2016 ) Central railway station, Frankfurt, Germany ( 2008 ) Train shed in Central railway station, Frankfurt, Germany ( 2005 ) Grand Central Terminal, Manhattan, New York City ( 2008 ) Arches in Main Concourse, Grand Central Terminal, Manhattan, New York City ( 2014 ) Washington Union Station, Washington, D.C ( 2015 ) Interior arches in Washington Union Station, Washington, D.C ( 2006 ) Chicago Union Station, Chicago, Illinois ( 1974 ) Arches in Great Hall, Chicago Union Station, Chicago, Illinois ( 2010 ) Haus der Kulturen der Welt, Berlin, Germany ( 2011 ) The Colosseum in Rome ( 2013 ) Arches inside the Colosseum in Rome ( 2005 ) Amir Chakhmaq Complex, Yazd, Iran ( 2014 ) Stonework arches seen in a ruined stonework building -- Burg Lippspringe, Germany ( 2005 ) Several arches at the Casa Simón Bolívar in Havana, Cuba ( 2006 ) Kings College, University of Cambridge in Cambridge, England ( 2007 ) Arches in dining hall at Kings College, University of Cambridge, Cambridge, England ( 2007 ) Memorial Hall, Harvard University, Cambridge, Massachusetts ( circa 1897 - 1924 photochrom post card ) Arches inside transept, Memorial Hall, Harvard University, Cambridge, Massachusetts ( 2016 ) Arches inside Annenberg Hall, Memorial Hall, Harvard University, Cambridge, Massachusetts ( 2016 ) Healy Hall, Georgetown University, Washington, D.C. ( 2009 ) Arches inside Healy Hall, Georgetown University, Washington, D.C. ( 2010 ) Central Tower, Erasmus Hall High School, Brooklyn, New York City ( 2013 ) Neuschwanstein Castle, Bavaria, Germany ( 2006 ) Arches in throne room of Neuschwanstein Castle, Bavaria, Germany ( 1886 photochrom print ) Arches in the nave of the church in monastery of Alcobaça, Portugal ( 2008 ) North facade of Chartres Cathedral, Chartres, France ( 2008 ) Arches in choir of Chartres Cathedral, Chartres, France ( 2013 ) Western facade, Westminster Abbey, City of Westminster, London ( 2013 ) Arches in nave of Westminster Abbey, City of Westminster, London ( 2006 ) Washington National Cathedral in Washington, D.C. ( Between 1990 and 2006 ) Arches inside the Washington National Cathedral, Washington, D.C. ( 2005 ) Main facade of St. Peter 's Basilica, Vatican City, Rome ( 2015 ) Interior arches in St. Peter 's Basilica, Vatican City ( 2009 ) Hagia Sophia in Istanbul, Turkey ( 2013 ) Arches inside the Hagia Sophia in Istanbul, Turkey ( 1983 ) Arches inside the western upper gallery, Hagia Sophia, Istanbul, Turkey ( 2007 ) Interior arches in Masjid al - Haram, Mecca, Saudi Arabia ( 2008 ) Roof of Masjid al - Haram, Mecca, Saudi Arabia ( 2008 ) Dome of the Rock, Old City of Jerusalem ( 2010 ) Arches inside Dome of the Rock, Old City of Jerusalem ( 2014 ) Taj Mahal in Agra, Uttar Pradesh, India ( 2009 ) The Great Gate ( Darwaza - i - rauza ) : Entrance to grounds of Taj Mahal, Agra, Uttar Pradesh, India ( 2004 ) Arches inside the Taj Majal, Agra, Uttar Pradesh, India East side of United States Capitol in Washington, D.C. ( 2005 ) Arches in corridor of United States Capitol, Washington, D.C. ( 2006 ) Thomas Jefferson Building, Library of Congress, Washington, D.C. ( 2008 ) Arches in Main Reading Room, Thomas Jefferson Building, Library of Congress, Washington, D.C. ( 2009 ) Arches in Great Hall, Thomas Jefferson Building, Library of Congress, Washington, D.C. ( 2007 ) Art Deco arches on Chrysler Building, Manhattan, New York City ( 2005 ) New York Public Library Main Branch, Manhattan, New York City ( 2016 ) Arches inside entrance of New York Public Library Main Branch, Manhattan, New York City ( 2012 ) Metropolitan Museum of Art, Manhattan, New York City ( 2012 ) Arches in Great Hall, Metropolitan Museum of Art, Manhattan, New York City ( 2012 ) Arches in Sculpture Gallery, West Building, National Gallery of Art, Washington, D.C. ( 2007 ) Winter Palace, Hermitage Museum, St. Petersburg, Russia ( 2016 ) Arches near the Jordan Staircase, Winter Palace, Hermitage Museum, St. Petersburg, Russia ( 2015 ) Arches in Pavilion Hall, Small Hermitage, Hermitage Museum, St. Petersburg, Russia ( 2015 ) Cour Carrée, Louvre Palace, Paris ( 2010 ) Arches in Salle du Manège, Louvre Palace, Paris ( 2007 ) Palace of Versailles, Versailles, Yvelines, France ( 2012 ) Arches in Galerie des Batailles, Palace of Versailles, Versailles, Yvelines, France ( 2013 ) Arches in Hall of Mirrors, Palace of Versailles, Versailles, Yvelines, France ( 2011 ) Palace of Westminster, City of Westminster, London ( 2010 ) Arches in Westminster Hall, Palace of Westminster, City of Westminster, London ( 2011 ) Arches in St. Stevens Hall, Palace of Westminster, City of Westminster, London ( 2007 ) Aljafería Palace in Zaragoza, Spain ( 2005 ) Horseshoe arch inside Aljafería Palace, Zaragoza, Spain ( 2004 ) Multifoil arches inside Aljafería Palace, Zaragoza, Spain ( 2004 ) Catenary arches inside Casa Milà in Barcelona, Spain by Antoni Gaudí ( 2010 ) Rajasthani style arches inside the 16th - century City Palace, Udaipur, India ( 2013 ) Main façade of the Itamaraty Palace in Brasília, Brazil, decorated with many arches ( 2005 ) Smithsonian Institution Building ( `` The Castle '' ), Washington, D.C. ( 2007 ) Arches inside the Smithsonian Institution Building ( `` The Castle '' ), Washington, D.C. ( 2012 ) National Building Museum ( formerly Pension Building ), Washington, D.C. ( 2005 ) Arches inside the National Building Museum ( formerly Pension Building ), Washington, D.C. ( 2007 ) Main facade of the Old Post Office Building ( now the Trump International Hotel ) in Washington, D.C. ( 2012 ) Bankstown Reservoir, Sydney, Australia ( 2018 ) Front entrance of the Old Post Office Building in Washington, D.C. ( 2006 ) Arches inside Old Post Office Building in Washington, D.C. ( 2009 ) Arches in Merzouga, Morocco ( 2011 ) Crypt of the Popes in the Catacomb of Callixtus, Rome ( 2007 ) Chinese Eastern Han Dynasty ( 25 -- 220 AD ) tomb chamber, Luoyang ( 2008 ) Entrance to Washington family tomb at Mount Vernon, Fairfax County, Virginia ( 2014 ) Natural Bridge in Rockbridge County, Virginia ( 2014 ) Landscape Arch, Arches National Park, Utah ( 2009 ) Double O Arch, Arches National Park, Utah ( 2007 ) Rainbow Bridge, Rainbow Bridge National Monument, Utah ( 2012 ) Aloba Arch, Ennedi - Est Region, Chad ( 2015 ) Medial longitudinal arch of the human foot ( Gray 's Anatomy ) See also Arch bridge Catenary arch Dome Golden Arches List of post-Roman triumphal arches List of Roman triumphal arches Natural arch Order moulding Skew arch Suspension bridge References Jump up ^ `` arch, n. 2 '' Oxford English Dictionary 2nd ed. 2009. Jump up ^ `` vault, n. 2. '' The Century Dictionary and Cyclopedia Dwight Whitney, ed... vol. 10. New York. 1911. 6707. Print. Jump up ^ `` Ancient Mesopotamia : Architecture ''. The Oriental Institute of the University of Chicago. Retrieved 16 May 2012. Jump up ^ Vaidyanathan, R ( 2004 ). Structural Analysis, Volume 2. USA : Laxmi Publications. p. 127. ISBN 81 - 7008 - 584 - 5. Jump up ^ Ambrose, James ( 2012 ). Building Structures. Hoboken, New Jersey : John Wiley & Sons, Inc. p. 30. ^ Jump up to : Ambrose, James ( 2012 ). Building Structures. Hoboken, New Jersey : John Wiley & Sons, Inc. p. 31. ISBN 978 - 0 - 470 - 54260 - 6. ^ Jump up to : Reynolds, Charles E ( 2008 ). Reynolds 's Reinforced Concrete Designer 's Handbook. New York, NY : Psychology Press. p. 41. ISBN 0 - 419 - 25820 - 5. Jump up ^ Luebkeman, Chris H. `` Support and Connection Types ''. MIT.edu Architectonics : The Science of Architecture. MIT.edu. Retrieved 3 February 2013. ^ Jump up to : Ambrose, James ( 2012 ). Building Structures. Hoboken, New Jersey : John Wiley & Sons, Inc. p. 32. ISBN 978 - 0 - 470 - 54260 - 6. Jump up ^ Oleson, John ( 2008 ). The Oxford Handbook of Engineering and Technology in the Classical World. USA : Oxford University Press. p. 299. ISBN 0 - 19 - 518731 - 8. Jump up ^ Crossley, Paul ( 2000 ). Gothic Architecture. New Haven, CT : Yale University Press. p. 58. ISBN 0 - 300 - 08799 - 3. Jump up ^ Hadrovic, Ahmet ( 2009 ). STRUCTURAL SYSTEMS IN ARCHITECTURE. On Demand Publishing. p. 289. ISBN 1 - 4392 - 5944 - 5. Jump up ^ MHHE. `` STRUCTURAL SYSTEMS IN ARCHITECTURE ''. MHHE.com. Archived from the original on 13 March 2013. Retrieved 3 February 2013. Jump up ^ Rasch 1985, p. 117 Jump up ^ Lefkovits, Etgar ( April 8, 2008 ). `` Oldest arched gate in the world restored ''. Jerusalem : The Jerusalem Post. Archived from the original on August 14, 2013. Retrieved January 21, 2018. Jump up ^ Galliazzo 1995, p. 36 ; Boyd 1978, p. 91 Jump up ^ Jorge Barrera ( 2010 - 11 - 12 ). `` Teotihuacan ruins explored by a robot, AP report in the Christian Science Monitor, November 12, 2010 ''. Csmonitor.com. Retrieved 2013 - 06 - 08. Jump up ^ Brosius, Maria ( 2006 ), The Persians : An Introduction, London & New York : Routledge, p. 128, ISBN 0 - 415 - 32089 - 5. Jump up ^ Garthwaite, Gene Ralph ( 2005 ), The Persians, Oxford & Carlton : Blackwell Publishing, Ltd., p. 84, ISBN 1 - 55786 - 860 - 3. Jump up ^ Schlumberger, Daniel ( 1983 ), `` Parthian Art '', in Yarshater, Ehsan, Cambridge History of Iran, 3.2, London & New York : Cambridge University Press, p. 1049, ISBN 0 - 521 - 20092 - X. Jump up ^ Wright, G.R.H., Ancient building technology vol. 3. Leiden, Netherlands. Koninklijke Brill NV. 2009. p. 237. Print. Jump up ^ Robertson, D.S. : Greek and Roman Architecture, 2nd edn., Cambridge 1943, p. 231 Jump up ^ Galliazzo 1995, pp. 429 -- 437 Jump up ^ O'Connor 1993, p. 171 Jump up ^ Needham, Joseph ( 1986 ), Science and Civilization in China : Volume 4, Physics and Physical Technology, Part 3, Civil Engineering and Nautics, Taipei : Caves Books, pp 161 - 188, ISBN 0 - 521 - 07060 - 0. Jump up ^ Needham, Joseph ( 1986 ), Science and Civilisation in China : Volume 4, Physics and Physical Technology ; Part 2, Mechanical Engineering, Taipei : Caves Books, pp 171 - 172 ISBN 0 - 521 - 05803 - 1. Jump up ^ Liu, Xujie ( 2002 ), `` The Qin and Han dynasties '', in Steinhardt, Nancy S., Chinese Architecture, New Haven : Yale University Press, p. 56, ISBN 0 - 300 - 09559 - 7. Jump up ^ Wang, Zhongshu ( 1982 ), Han Civilization, translated by K.C. Chang and Collaborators, New Haven and London : Yale University Press, pp 1, 30, 39 - 40, ISBN 0 - 300 - 02723 - 0. Jump up ^ Chang, Chun - shu ( 2007 ), The Rise of the Chinese Empire : Volume II ; Frontier, Immigration, & Empire in Han China, 130 B.C. -- A.D. 157, Ann Arbor : University of Michigan Press, pp 91 - 92, ISBN 0 - 472 - 11534 - 0. Jump up ^ Morton, William Scott ; Lewis, Charlton M. ( 2005 ), China : Its History and Culture ( Fourth ed. ), New York City : McGraw - Hill, p. 56, ISBN 0 - 07 - 141279 - 4. Jump up ^ Liu, Xujie ( 2002 ), `` The Qin and Han dynasties '', in Steinhardt, Nancy S., Chinese Architecture, New Haven : Yale University Press, p. 55, ISBN 0 - 300 - 09559 - 7. ' Jump up to : ^ Steinhardt, Nancy Shatzman ( 2005 ), `` Pleasure tower model '', in Richard, Naomi Noble, Recarving China 's Past : Art, Archaeology, and Architecture of the ' Wu Family Shrines, New Haven and London : Yale University Press and Princeton University Art Museum, pp. 279 -- 280, ISBN 0 - 300 - 10797 - 8. Jump up ^ Wang, Zhongshu ( 1982 ), Han Civilization, translated by K.C. Chang and Collaborators, New Haven and London : Yale University Press, pp 175 - 178, ISBN 0 - 300 - 02723 - 0. Jump up ^ Watson, William ( 2000 ), The Arts of China to AD 900, New Haven : Yale University Press, p. 108, ISBN 0 - 300 - 08284 - 3. Jump up ^ Knapp, Ronald G. ( 2008 ). Chinese Bridges : Living Architecture From China 's Past. Singapore : Tuttle Publishing. pp. 122 -- 127. ISBN 978 - 0 - 8048 - 3884 - 9. Jump up ^ Needham, Joseph. The Shorter Science and Civilisation in China. Cambridge University Press, 1994. ISBN 0 - 521 - 29286 - 7. Pages 145 - 147. Jump up ^ This title strictly applies only to the sum of attributes given ( O'Connor, Colin : Roman Bridges, Cambridge University Press 1993, ISBN 0 - 521 - 39326 - 4, p. 171 ) : Various Roman stone pillar bridges featured wooden open - spandrel segmental arches as early as the 2nd century CE, among them Trajan 's bridge, the longest bridge of the world to have been built for over a thousand years. Also, a dozen or more Roman close - spandrel stone segmental arch bridges are known from the 1st century BC onwards, such as the Ponte San Lorenzo ( Padua ), Alconétar Bridge and the Makestos Bridge ( Turkey ), the last having half - open spandrels. The 27 segmental arches of the Bridge at Limyra ( 300 ce ) feature span to rise ratios between 5.3 and 6.5 to 1, making it an earlier example of a stone quarter circle segmental arch bridge. This leaves the Anji bridge the title of `` the oldest open - spandrel stone quarter circle segmental arch bridge in the world ''. Jump up ^ Stuart Munro - Hay, Aksum : A Civilization of Late Antiquity. Edinburgh : University Press. 199 Jump up ^ Chihara, Daigorō ( 1996 ). Hindu - Buddhist Architecture in Southeast Asia. BRILL. ISBN 9004105123. Jump up ^ Le, Huu Phuoc ( 2010 ). Buddhist Architecture. Grafikol. ISBN 9780984404308. Jump up ^ Reid, Esmond ( 1984 ). Understanding Buildings : A Multidisciplinary Approach. Cambridge, MA : MIT Press. p. 12. ISBN 0 - 262 - 68054 - 8. Jump up ^ Allen, Edward ( 2009 ). Fundamentals of Building Construction. Hoboken, NJ : John Wiley & Sons. p. 529. ISBN 978 - 0 - 470 - 07468 - 8. Jump up ^ Davies, David ( 2014 - 04 - 17 ). Cambridge IGCSE Geography Revision Guide Student 's Book. Cambridge University Press. ISBN 9781107674820. Further reading Boyd, Thomas D. ( 1978 ), `` The Arch and the Vault in Greek Architecture '', American Journal of Archaeology, 82 ( 1 ) : 83 -- 100 ( 91 ), doi : 10.2307 / 503797 Galliazzo, Vittorio ( 1995 ), I ponti romani, Vol. 1, Treviso : Edizioni Canova, ISBN 88 - 85066 - 66 - 6 O'Connor, Colin ( 1993 ), Roman Bridges, Cambridge University Press, ISBN 0 - 521 - 39326 - 4 Rasch, Jürgen ( 1985 ), `` Die Kuppel in der römischen Architektur. Entwicklung, Formgebung, Konstruktion '', Architectura, 15, pp. 117 -- 139 Roth, Leland M ( 1993 ). Understanding Architecture : Its Elements History and Meaning. Oxford, UK : Westview Press. ISBN 0 - 06 - 430158 - 3. pp. 27 -- 8 External links Wikiquote has quotations related to : Arch Wikimedia Commons has media related to Arch. Wikimedia Commons has media related to Arches. Physics of Stone Arches by Nova : a model to build an arch without it collapsing InteractiveTHRUST : interactive applets, tutorials DIYinfo. org 's Constructing Brick Arches Wiki - A wiki on how to construct brick arches around the house DIYinfo. org 's Constructing Timber Framed Arches Wiki - Similar to the brick arches but extra information for timber arches Paper about the three - hinged arch of the Galerie des Machines of 1889 Whitten by Javier Estévez Cimadevila & Isaac López César. Rooms and spaces of a house Shared residential rooms Billiard room Bonus room Common room Den Dining room Ell Family room Garret Great room Hearth room Home cinema Home office Kitchen Dirty kitchen Kitchenette Living room Man cave Recreation room Shrine Study Sunroom Spaces Atrium Balcony Breezeway Catio Conversation pit Deck Elevator Entryway / Genkan Foyer Hallway Lanai Loft Loggia Overhang Patio Porch screened sleeping Ramp Secret passage Stairs Terrace Veranda Vestibule Utility and storage Attic Basement Box room Carport Cloakroom Closet Electrical room Equipment room Furnace room / Boiler room Garage Janitorial closet Larder Laundry room / Utility room Mechanical room / floor Pantry Root cellar Semi-basement Spear closet Storm cellar / Safe room Studio Subbasement Wardrobe Wine cellar Wiring closet / Demarcation point Workshop Private rooms Bathroom Bedroom / Guest room Boudoir Cabinet Jack and Jill bathroom Nursery Suite Toilet Walk - in closet Great house areas Antechamber Ballroom Butler 's pantry Buttery Conservatory Courtyard Drawing room Fainting room Great chamber Great hall Long gallery Lumber room Parlour Porte - cochère Saucery Sauna Scullery Servants ' hall Servants ' quarters Smoking room Solar Spicery State room Still room Swimming pool Undercroft Other Building Furniture House plan Multi-family residential Secondary suite Single - family detached home Studio apartment Architectural elements Arch Baluster Ceiling Colonnade Column Floor Gate Lighting Medallion Ornament Portico Roof Vault Architecture portal Design portal Engineering portal Bridges portal GND : 4146210 - 5 NDL : 00560402 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Arch&oldid=835318688 '' Categories : Arch bridges Arches and vaults Natural arches Bridge components Hidden categories : Use British English Oxford spelling from August 2016 Wikipedia articles needing page number citations from September 2010 All articles with unsourced statements Articles with unsourced statements from February 2011 All articles with dead external links Articles with dead external links from March 2017 Articles with permanently dead external links Wikipedia articles with GND identifiers Talk Contents About Wikipedia Wikiquote Afrikaans Alemannisch Aragonés Asturianu Azərbaycanca বাংলা Bân - lâm - gú Башҡортса Беларуская Беларуская ( тарашкевіца ) ‎ Български Bosanski Brezhoneg Буряад Català Čeština Cymraeg Dansk Deutsch Eesti Ελληνικά Español Esperanto Euskara فارسی Fiji Hindi Français Frysk Gaeilge Galego 贛 語 한국어 Հայերեն हिन्दी Hrvatski Ilokano Bahasa Indonesia Interlingua Íslenska Italiano עברית ქართული Қазақша Kiswahili Кыргызча Latina Latviešu Lëtzebuergesch Lietuvių Ligure Magyar മലയാളം Bahasa Melayu မြန်မာဘာသာ Nederlands 日本 語 Norsk Norsk nynorsk Nouormand Occitan Oʻzbekcha / ўзбекча ਪੰਜਾਬੀ پنجابی پښتو Patois Polski Português Română Runa Simi Русский Scots Sicilianu Simple English Slovenščina کوردی Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska Tagalog தமிழ் Татарча / tatarça తెలుగు ไทย Türkçe Українська اردو Tiếng Việt Võro West - Vlams Winaray ייִדיש 粵語 中文 Kabɩyɛ 87 more Edit links This page was last edited on 7 April 2018, at 23 : 32. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: what do pointed arches do with the weight of a structure
Answer: less thrust at the base