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A pointed arch, ogival arch, or Gothic arch is an arch with a pointed crown meet at an angle at the top of the arch. [1] Also known as a two-centred arch, its form is derived from the intersection of two circles. [2] This architectural element was particularly important in Gothic architecture.
An important feature of Gothic architecture was the flying buttress, a half-arch outside the building which carried the thrust of weight of the roof or vaults inside over a roof or an aisle to a heavy stone column. The buttresses were placed in rows on either side of the building, and were often topped by heavy stone pinnacles, both to give ...
Early Gothic architecture was the result of the emergence in the 12th century of a powerful French state centered in the Île-de-France.King Louis VI of France (1081–1137), had succeeded, after a long struggle, in bringing the barons of northern France under his control, and successfully defended his domain against attacks by the English King, Henry I of England (1100–1135).
The vertical plan of early Gothic cathedrals had three levels, each of about equal height; the clerestory, with arched windows which admitted light on top, under the roof vaults; the triforium a wider covered arcade, in the middle; and, on the ground floor, on either side of the nave, wide arcades of columns and pillars, which supported the weight of the ceiling vaults through the ribs
The style evolved to one that was less heavy, had larger windows, lighter-weight vaulting supported on stone ribs and above all, the pointed arch which is the defining characteristic of the style now known as Gothic. With thinner walls, larger windows and high pointed arched vaults, the distinctive flying buttresses developed as a means of support.
A hammer-beam is a form of timber roof truss, allowing a hammerbeam roof to span greater than the length of any individual piece of timber.In place of a normal tie beam spanning the entire width of the roof, short beams – the hammer beams – are supported by curved braces from the wall, and hammer posts or arch-braces are built on top to support the rafters and typically a collar beam.