Information AboutArches |
| CATEGORIES ABOUT ARCH | |
| arch bridges | |
| arches and vaults | |
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An arch is a curved structure capable of , Egypt , Assyria , Etruria , and later refined in Ancient Rome . The arch became an important technique in Cathedral building and is still used today in some modern structures such as Bridge s. TECHNICAL ASPECTS The arch is significant because, in theory at least, it provides a structure which eliminates Tensile Stress es in spanning an open space. All the forces are resolved into Compressive Stress es. This is useful because several of the available building materials such as Stone , Cast Iron and Concrete can strongly resist compression but are very weak when Tension , Shear or Torsional stress is applied to them. By using the arch configuration, significant spans can be achieved. The arch is a very useful structure as it is completely self-supporting. This is because all the compressive forces hold it together in a state of equilibrium. This even applies to frictionless surfaces. This same principle holds when the Force acting on the arch is not vertical such as in spanning a doorway, but horizontal, such as in arched Retaining Wall s or Dam s. Even when using concrete, where the structure may be monolithic, 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, it has to be resisted by carefully placed Reinforcement Rods or fibres. (See Arch Bridge .) The following gallery shows examples of arch forms displayed in roughly the order in which they were developed. |
Image:Rundbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Round_arch" class="copylinks">Round Arch or Semi-circular arch |
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Image:Segmentbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Segmental_arch" class="copylinks">Segmental Arch |
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Image:Stigande BågepngUnequal Round Arch Or
| "http://wwwinformationdelightinfo/encyclopedia/entry/Rampant_round_arch" class="copylinks">Rampant Round Arch |
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Image:Lansettbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Lancet_arch" class="copylinks">Lancet Arch |
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Image:Spetsbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Equilateral_pointed_arch" class="copylinks">Equilateral Pointed Arch |
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Image:Skulderbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Shouldered_flat_arch" class="copylinks">Shouldered Flat Arch |
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Image:TrepassbågepngThree-foiled
| "http://wwwinformationdelightinfo/encyclopedia/entry/cusped_arch" class="copylinks">Cusped Arch |
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Image:Hästskobågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Horseshoe_arch" class="copylinks">Horseshoe Arch |
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Image:Korgbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Three-centred_arch" class="copylinks">Three-centred Arch |
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Image:Ellipsbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Elliptical_arch" class="copylinks">Elliptical Arch |
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Image:Draperibågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Inflexed_arch" class="copylinks">Inflexed Arch |
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Image:Kölbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Ogee_arch" class="copylinks">Ogee Arch |
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Image:Karnisbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Ogee_arch" class="copylinks">Reverse Ogee Arch |
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Image:Tudorbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Tudor_arch" class="copylinks">Tudor Arch |
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Image:Parabelbågepng
| "http://wwwinformationdelightinfo/encyclopedia/entry/Catenary" class="copylinks">Catenary or Parabolic Arch |
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