Semicircular arch is an arch with intrados (inner surface) shaped like a semicircle. [1] [2] This type of arch was adopted and very widely used by the Romans, thus becoming permanently associated with the Roman architecture. [3]
When the arch construction involves the Roman techniques (either wedge-like stone voussoirs or thin Roman bricks), it is known as a Roman arch. [4] The semicircular arch is also known as a round arch. [5] [6]
The rise (height) of a round arch is limited to 1⁄2 of its span, [7] so it looks more "grounded" than a parabolic arch [3] or a pointed arch. [7] Whenever a higher semicircular arch was required (for example, for a narrow arch to match the height of a nearby broad one), either stilting or horseshoe shape were used, thus creating a stilted arch (also surmounted [8]) and horseshoe arch respectively. [9] These "shifts and dodges" were immediately dropped once the pointed arch with its malleable proportions was adopted. [7] Still, "the Romanesque arch is beautiful as an abstract line. Its type is always before us in that of the apparent vault of heaven, and horizon of the earth" ( John Ruskin, " The Seven Lamps of Architecture"). [10]
When the architecture of the building dictates the rise of he arch to be less that 1⁄2 of its span (for example, in Roman residential construction), a segmental arch with a rounded shape that is less than a semicircle can be used. [11]
The popularity of the semicircular arch is based on simplicity of its layout and construction, [12] not superior structural properties. The sides of this arch swing wider than the perfect funicular curve and therefore experience a bending moment with the force directed outwards. [13] To prevent buckling, heavy surcharge (fill), so called spandrel, needs to be applied outside of the haunches. [12]
In addition to the Imperial Roman construction, round arches are also associated with Byzantine, Romanesque (and Neo-Romanesque), Renaissance [14] and Rundbogenstil styles. While the semicircular arch was known in the Greek architecture, it mostly played there a decorative, not structural, role. [15]
Semicircular arch is an arch with intrados (inner surface) shaped like a semicircle. [1] [2] This type of arch was adopted and very widely used by the Romans, thus becoming permanently associated with the Roman architecture. [3]
When the arch construction involves the Roman techniques (either wedge-like stone voussoirs or thin Roman bricks), it is known as a Roman arch. [4] The semicircular arch is also known as a round arch. [5] [6]
The rise (height) of a round arch is limited to 1⁄2 of its span, [7] so it looks more "grounded" than a parabolic arch [3] or a pointed arch. [7] Whenever a higher semicircular arch was required (for example, for a narrow arch to match the height of a nearby broad one), either stilting or horseshoe shape were used, thus creating a stilted arch (also surmounted [8]) and horseshoe arch respectively. [9] These "shifts and dodges" were immediately dropped once the pointed arch with its malleable proportions was adopted. [7] Still, "the Romanesque arch is beautiful as an abstract line. Its type is always before us in that of the apparent vault of heaven, and horizon of the earth" ( John Ruskin, " The Seven Lamps of Architecture"). [10]
When the architecture of the building dictates the rise of he arch to be less that 1⁄2 of its span (for example, in Roman residential construction), a segmental arch with a rounded shape that is less than a semicircle can be used. [11]
The popularity of the semicircular arch is based on simplicity of its layout and construction, [12] not superior structural properties. The sides of this arch swing wider than the perfect funicular curve and therefore experience a bending moment with the force directed outwards. [13] To prevent buckling, heavy surcharge (fill), so called spandrel, needs to be applied outside of the haunches. [12]
In addition to the Imperial Roman construction, round arches are also associated with Byzantine, Romanesque (and Neo-Romanesque), Renaissance [14] and Rundbogenstil styles. While the semicircular arch was known in the Greek architecture, it mostly played there a decorative, not structural, role. [15]