Types of dome
The dome has a long history in the built environment, and has been a design feature of many different kinds of architecture around the world. Domes are prominent features of Persian, Roman, Byzantine, Islamic, and Italian Renaissance design.
In its simplest form, a dome is a hollow semi-spherical structural element. However, there are many variations on this basic shape, and The ‘Building Construction Handbook’ describes domes as: ‘Double curvature shells which can be rotationally formed by any curved geometrical plane figure rotating about a central vertical axis.’
Domes evolved from arches, originally being adapted only to small buildings such as huts and tombs; however, as construction and design techniques developed, they became more popular as a means of showcasing grand structures such as cathedrals, legislative buildings and, more recently, leisure buildings such as sports stadia.
In historical terms, the representational efficiency of the dome has made it popular among those seeking to reinforce the notion of a centralised and singular power system, whether absolute monarchy, monotheism, hegemonic dictatorship, fascism, and so on.
Some of the terminology that is often associated with domes include:
- Apex: The uppermost point of a dome (also known as the ‘crown’).
- Cupola: A small dome located on a roof or turret.
- Extrados: The outer curve of a dome.
- Haunch: Part of an arch that that lies roughly halfway between the base and the top.
- Intrados: The inner curve of a dome.
- Springing: The point from which the dome rises.
Domes can be constructed from a variety of materials, from traditional masonry and concrete, to cast iron, timber and steel. More recently, lightweight materials such as architectural fabrics and cable structures have also been used to create ‘domes’; for the most part these are not true domes as their components have an anticlastic shape, however inflated fabric structures can be dome shaped.
Traditional domes can be highly-efficient structures, similar to arches. They are self-supporting, stabilised by the force of gravity acting on their weight to hold them in compression. They are able to span large areas and require no intermediary columns, creating a free space below.
However, the weight of traditional domes produces downward and outward thrusts. The downward thrust must be transferred to the foundations, whilst the outward thrust must be resisted to prevent the dome from collapsing. This resistance can be provided by the mass of the supporting walls, by buttresses, or by a tension element such as a perimeter ring, cable or chain.
 Types of dome
Dating back to Paleolithic construction, this is one of the earliest dome forms, also known as a ‘beehive dome’. They are not domes in the strict sense, as they are formed by horizontal masonry layers that are slightly cantilevered until meeting in the centre.
This is one of the earliest type of ribbed vault where the ribs, instead of meeting in the dome’s centre, are intertwined to form polygons, leaving an empty space in the centre. The earliest known example is in Spain’s Great Mosque of Cordoba, dating back to the 10th century.
Geodesic domes are sphere-like structures consisting of a network of triangles which provide a self-balancing structural framework whilst using minimal materials. They were developed by the American engineer and architect Buckminster Fuller in the late 1940s.
For more information, see Geodesic dome.
These domes are characterised by the way they bulge out beyond their base diameters and taper smoothly in an ogee (S-curve) profile. Their height usually exceeds their width and they are often gilded or brightly painted. These are traditionally associated with Russian architecture, in particular their multi-domed churches. For more information, see St. Basil’s Cathedral.
Also known as ‘hemispherical domes’, these are one half of a sphere, constructed on a circular ring beam.
Also known as a ‘ribbed’, ‘parachute’ or ‘scalloped’ dome. These are divided into curved segments that follow the elevation’s curve. Radial lines of masonry that act as the dome’s ‘ribs’ extend down the springing from the apex.
 Related articles on Designing Buildings Wiki
- Barrel vault.
- Conoid shell.
- Florence Cathedral.
- Geodesic dome.
- Hagia Sophia.
- Hyperbolic paraboloid.
- Millennium Dome.
- Pendentive dome.
- Shell roof.
- St. Basil’s Cathedral.
- St Pauls Cathedral.
- Taj Mahal.
- The development of structural membranes.
- The history of fabric structures.
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