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The most common form of the Gothic pointed arch in windows and arches was based upon an equilateral triangle, in which the three sides have an equal length (the span of the arch is equal to the arc radii). This so called equilateral arch had the great advantage of simplicity. Stone cutters, or hewers, could precisely draw the arc on the stone ...
Since the sides of a triangular arch are experiencing bending stress, it is a false arch [3] in a structural sense (historically preceding the invention of true arches [8] and going back to Neolithic times [9]). The design was used in Anglo-Saxon England until the late 11th century (St Mary Goslany) over small openings. [2] [1]
by the material used (stone, brick, concrete, steel) and construction approach. [26] For example, the wedge-shaped voussoirs of a brick arch can be made by cutting the regular bricks ("axed brick" arch) or manufactured in the wedge shape ("gauged brick" arch); [28] structurally, by the number of hinges (movable joints) between solid components ...
Construction of a four-centred arch. A four-centred arch (Commonwealth spelling) or four-centered arch (American spelling) is a low, wide type of arch with a pointed apex.Its structure is achieved by drafting two arcs which rise steeply from each springing point on a small radius, and then turning into two arches with a wide radius and much lower springing point.
Multifoil arch in the Aljafería, Zaragoza, Spain. A multifoil arch (or polyfoil arch), also known as a cusped arch, [1] [2] polylobed arch, [3] [4] or scalloped arch, [5] is an arch characterized by multiple circular arcs or leaf shapes (called foils, lobes, or cusps) that are cut into its interior profile or intrados.
In contemporary architecture and interior design, the term architrave also refers to the mouldings that frame doors and windows. Unlike classical architraves, which were primarily structural and often ornate, modern architraves are typically decorative and functional, concealing the gap between the wall and the door or window frame.
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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 and horseshoe arch respectively. [8]