A curved compressive structural member, spanning openings or recesses; also built flat.
Back Arch: A concealed arch carrying the backing of a wall where the exterior facing is carried by a lintel. Jack Arch: One having horizontal or nearly horizontal upper and lower surfaces. Also called flat or straight arch. Major Arch: Arch with spans greater than 6 ft and equivalent to uniform loads greater than 1000 lb. per ft. Typically known as Tudor arch, semicircular arch, Gothic arch or parabolic arch. Has rise to span ratio greater than 0.15. Minor Arch: Arch with maximum span of 6 ft and loads not exceeding 1000 lb. per ft. Typically known as jack arch, segmental arch or multicentered arch. Has rise to span ratio less than or equal to 0.15. Relieving Arch: One built over a lintel, flat arch, or smaller arch to divert loads, thus relieving the lower member from excessive loading. Also known as discharging or safety arch. Trimmer Arch: An arch, usually a low rise arch of brick, used for supporting a fireplace hearth.
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