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The flying buttress (arc-boutant, arch buttress) is a specific form of buttress composed of a ramping arch that extends from the upper portion of a wall to a pier of great mass, in order to convey to the ground the lateral forces that push a wall outwards, which are forces that arise from vaulted ceilings of stone and from wind-loading on roofs.
Ceiling of the lower chapel. Small gilded flying buttresses reinforce the arches The lower chapel, with the Fleur-de-Lys of Louis IX (symbol from his French Capet royal family heritage) and the castle, (symbol of the Spanish royal family of his mother, Blanche of Castile), decorating the columns
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.
The north and south walls of the long nave are supported by eleven flying buttresses on each side. These counterbalance the outward thrust of the ceiling vaults, and make possible the great height, thin walls and large windows that bring abundant light into the nave. The double arches of each buttress make a leap from heavy pillars to the upper ...
The tile roof of the cathedral is from a different tradition, that of the architecture of Burgundy. The flying buttresses that support the walls of the nave are largely hidden by walls of the adjoining cloister and chapel, but those of the hemispherical chevet at the east end are dramatically visible.
These buttresses are accented by heavy weatherings in lighter coloured stone (creating visual contrast while drawing attention to the points of stress on the building), and topped with pinnacles, thus emphasizing their massiveness, structural function, and verticality. They provide spatial rhythm on the east and west facades.
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