A corbel arch (or corbeled / corbelled arch) is an arch-like construction method that uses the architectural technique of corbeling to span a space or void in a structure, such as an entranceway in a wall or as the span of a bridge. A corbel vault uses this technique to support the superstructure of a building's roof.
A corbel arch is constructed by offsetting successive courses of stone (or brick) at the springline of the walls so that they project towards the archway's center from each supporting side, until the courses meet at the apex of the archway (often, the last gap is bridged with a flat stone). For a corbeled vault covering the technique is extended in three dimensions along the lengths of two opposing walls.
Although an improvement in load-bearing efficiency over the post and lintel design, corbeled arches are not entirely self-supporting structures, and the corbeled arch is sometimes termed a "false arch" for this reason. Unlike "true" arches, not all of the structure's tensile stresses caused by the weight of the superstructure are transformed into compressive stresses. Corbel arches and vaults require significantly thickened walls and an abutment of other stone or fill to counteract the effects of gravity, which otherwise would tend to collapse each side of the archway inwards.
Other articles related to "corbel arch, arch":
... Angkorian engineers tended to use the corbel arch in order to construct rooms, passageways and openings in buildings ... A corbel arch is constructed by adding layers of stones to the walls on either side of an opening, with each successive layer projecting further towards the centre than the one supporting it from below ... The corbel arch is structurally weaker than the true arch, of which the Angkorian engineers appear to have been ignorant ...
... See also Corbel arch Corbel arch built from Cyclopean masonry, in the Greek Arkadiko bridge Corbel arch in the shape of an isosceles triangle, supporting the ... The steps of the masonry may be trimmed to make the arch have a rounded shape ... The corbel arch does not produce thrust, or outward pressure at the bottom of the arch, and is not considered a true arch ...
... Stone corbelled arch forms the hallways in the Palace at Palenque Brickwork corbelled arch at Ubud in Bali, Indonesia Stone corbelled arches at Borobodur in Java ... Notice to "T" shaped central stones Stone corbelled gateway arch to walls of Angkor Thom in Cambodia A brick corbelled arch disintegrating slowly at My ...
Famous quotes containing the word arch:
“Concords little arch does not span all our fate, nor is what transpires under it law for the universe.”
—Henry David Thoreau (18171862)