THE ARCH Universidad Simon Bolivar Ingles II Prof. MarianelaNajul By Felix Vivas and Adriana Ruiz
Content • Historical Origins • Parts of the Arch • Structural Behavior • Classification of Arches • The Arch Actually
THE ARCH IN THE ANTIQUITY: BEAM VS. ARCH • Beam -> Arch • Produces tensile forces which couldn’t be absorbed by stone, the most usual material at that antiquity • Stone -> week in tension
STRUCTURAL BEHAVIOR OF AN ARCH • Vertical loads • Horizontal loads • Transit of the loads Both of them act on the arch’s support
Stone resists compression very well, but it is week to traction. • The result is that each voussoir works only in compression, and it allows a distance much bigger between columns than beams do.
PARABOLIC • Used by Antoni Gaudi and modern architects (sthetics motives). • It is the most difficult to build because each voussoir is different
If we turn a parabolic arch around, we obtain the guidelinefor a suspension bridge
CIRCUMFERENCE • It is the most used since Antique Romans. • Circumference is the only curve with a constant curvature; this makes it easier and cheaper to build.
OJIVAL ARCH • Produces the minimum possible of horizontal loads in the supports • The voussoirs can all have the same shape, just like a circumference-shapedarch • It is resistant and easy to build
OTHER ARCHES… Horseshoe Arch • Tudor Arch
“Throught the arch, the matter defeats itself” Cayo Lacer, author of the Alcatara’s bridge