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.
Read more about Corbel Arch: Gallery
Famous quotes containing the word arch:
“Men themselves have wondered
What they see in me.
They try so much
But they can’t touch
My inner mystery.
When I try to show them,
They say they still can’t see.
I say,
It’s in the arch of my back,
The sun of my smile,
The ride of my breasts,
The grace of my style.
I’m a woman
Phenomenally.
Phenomenal woman,
That’s me.”
—Maya Angelou (b. 1928)