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# An introduction to arches

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An introduction to Arches:-- It explains the basic understanding about Arches before students start drafting in their drawing sheets. This presentation could be shown to first year B.Architecture students to make them a clear idea about Arches.

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### An introduction to arches

1. 1. HRISHIRAJ SARMA | A.P.I.E.D | 2014 1
2. 2. What is an Arch?  An Arch may be defined as mechanical arrangement of wedge-shaped blocks of stones or bricks mutually supporting each other and supported at the end by piers or abutments.  An arch is a structure that spans a space and supports structure and weight below it.  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. Function of an Arch  The function of an Arch is to carry weight of the structure above the opening.  Because of their shape, the blocks support each other by mutual pressure of their own weight.  Hence, the structure remains in the position by the resistance from the support. HRISHIRAJ SARMA | A.P.I.E.D | 2014 2
3. 3. Basic concept An arch is a pure 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. 1. Keystone 2. Voussoir 3. Extrados 4. Impost 5. Intrados 6. Rise 7. Clear span 8. Abutment HRISHIRAJ SARMA | A.P.I.E.D | 2014 3
4. 4. Type of Arch Materials of Construction Geometry 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Flat Arch. Semi-circular Arch. Segmental Arch. Relieving Arch. Dutch of French Arch. Elliptical Arch. Parabolic Arch. Four centered Arch. Five centered Arch. Seven centered Arch. 11. 12. 13. 14. 15. Tree foil Arch. Moorish Arch. Ogee Arch. Multifoil Arch. Tudor Arch. 1. Stone Arch. Rubble Arch, Aslar Arch. 2.Brick Arch. Rough Arch, Axed Brick Arch, Gauged Brick Arch, Arch of Brick bonds. 3. Concrete Arch Concrete block Arch Monolithic Concrete Arch R.C.C Arch 4. Wooden Arch. 5. Metal Arch. HRISHIRAJ SARMA | A.P.I.E.D | 2014 4
5. 5. Types of Arches on Geometry Flat Arch Semi circular Arch French of Dutch Arch Segmental Arch HRISHIRAJ SARMA | A.P.I.E.D | 2014 5
6. 6. Types of Arches on Geometry Relieving Arch Different Types of Arches HRISHIRAJ SARMA | A.P.I.E.D | 2014 6
7. 7. Types Of Arches on Geometry HRISHIRAJ SARMA | A.P.I.E.D | 2014 7
8. 8. Types Of Arches on Geometry Different Types of Arches HRISHIRAJ SARMA | A.P.I.E.D | 2014 8
9. 9. Types Of Arches on Geometry HRISHIRAJ SARMA | A.P.I.E.D | 2014 9
10. 10. Types Of Arches on Geometry HRISHIRAJ SARMA | A.P.I.E.D | 2014 10
11. 11. Types Of Arches on Material of Construction Rough Brick Arch HRISHIRAJ SARMA | A.P.I.E.D | 2014 Axed Brick Arch 11
12. 12. Types Of Arches on Material of Construction Rubble Arch R.C.C Arch AshlarArch Metal Arch HRISHIRAJ SARMA | A.P.I.E.D | 2014 Monolithic Concrete Arch Wooden Arch 12
13. 13. Uses of Arch  Arches with a circular form, also referred to as rounded arch, were commonly employed by the builders of ancient history, 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. Roman aqueduct near Nimes, France Horseshoe arches (9th century) in the Mosque of Uqba, in Kairouan, Tunisia HRISHIRAJ SARMA | A.P.I.E.D | 2014 13
14. 14. Uses of Arch  Pointed arches were most often used by builders of Gothicstyle architecture.  The advantage to using a pointed arch, rather than a circular arch, is that the arch action in a pointed arch 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 its central, pointed arch window, typical of Gothic architecture. HRISHIRAJ SARMA | A.P.I.E.D | 2014 14
15. 15. Uses of Arch  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 any arch type, 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. HRISHIRAJ SARMA | A.P.I.E.D | 2014 15
16. 16. Uses of Arch  Vaults are essentially "adjacent arches 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. HRISHIRAJ SARMA | A.P.I.E.D | 2014 16
17. 17. History of Arch  True arches, as opposed to corbel arches, were known by a number of civilizations in the Ancient Near East, the Levant, and Mexico, but their use was infrequent and mostly confined to underground structures such as drains where the problem of lateral thrust is greatly diminished. Arch of the Near East Arch of Levant HRISHIRAJ SARMA | A.P.I.E.D | 2014 Mayan Corbel Arch 17
18. 18. History of Arch  A rare exception is the bronze age arched city gate of Ashkelon (modern day Israel), dating to ca. 1850 B.C.  An early example of a voussoir arch appears in the Greek Rhodes Footbridge.  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 City gate of Ashkelon Greek Rhodes Footbridge HRISHIRAJ SARMA | A.P.I.E.D | 2014 Arch-roofed passageway underneath the Pyramid 18 of Quetzalcoatl
19. 19. History of Arch  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.  Throughout the Roman empire, their engineers erected arch structures such as bridges, aqueducts, and gates. HRISHIRAJ SARMA | A.P.I.E.D | 2014 19
20. 20. History of Arch  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 which was also assumed by domed structures from the 1st century BC onwards. Arch of Constantine, Rome Arch of Triumph in Genoa, Italy HRISHIRAJ SARMA | A.P.I.E.D | 2014 20
21. 21. Examples of Arches Gothic Arch Muslim Arch Roman Arch HRISHIRAJ SARMA | A.P.I.E.D | 2014 Hindu Arch 21
22. 22. Why Arch is Important  The arch is important because it is a marvelous way to structurally support the mass of a building roof, a railway line, or an aqueduct, like the ones the Romans built.  Some of the arches built by Ancient Romans still stand today, and they offer a mute testament to the effectiveness of the arch in engineering.  The arch is still in wide use today, and we even see big glue-lams (wood glued to laminate it to make large beams) in the shape of arches. The arch has a long history in structures man has built HRISHIRAJ SARMA | A.P.I.E.D | 2014 22