Arch

An arch is a structure that spans a space while supporting weight. Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture and their systematic use started with the Ancient Romans who were the first to apply the technique to a wide range of structures. In terms of structure is very convenient the use of arch, beacuse it provides a structure that eliminates tensile stress in spanning open spaces. All forces are resolved into compressive stress. The advantage of this property in terms of materials is that many construction materials such as stone, cast iron and concrete can strongly resist compression but are very week when tension.