Dome Flashcards
A vaulted structure having a circular plan and usually the form of a portion of a sphere, so constructued as to exert an equal thrust in all directions.
Dome
A curved line describing a vertical section cut through the axis of a rotational surface.
Meridional Line
A circular line describing a horizontal section cut perpendicular to the axis of a rotational surface.
Hoop Line
A dome having the form of a hemisphere.
Semicircular Dome
Transition from meridional to hoop forces occurs at an angle of from 45d to 60d from the vertical axis for most load condtitions.
A force acting along a hoop lne of a dome strcuture, perpendicular to meridional forces. Hoop forces, which restrain the out-of-plane movement of the meridional strips in the shell of a dome, are compressive in the upper zone and tensile in the lower zone.
Hoop Force
A force acting along a meridional line of a dome structure, always compressive under full vertical loading.
Meridional Force
A dome having the form of a segment of a sphere; with its center well below the springing line. It is particularly sensitive to buckling under an external load.
Saucer Dome
A ring encircling the base of a dome to contain the outward components of the meridional forces. In a concrete dome, this ring is thickened and reinforced to handle the bending stresses caused by the differing elastic deformations.
Tension Ring
The circle of greatest diameter can be drawn on a circle.
Great Circle
A dome built with steel or timber trusses arranged in a radial manner and connected by polygonal rings at various heights.
Radial Dome
A steel dome structure having members that follow the lines of latitude and longitude, and a third set of diagonals completing the triangulation.
Schwedler dome
A steel dome structure having members that follow the circles of latitude, and two sets of diagonals replacing the lines of longitude and forming a series of isosceles triangles.
Lattice Dome
A steel dome having members that follow three principal sets of great circles intersecting at 60d, subdividing the dome surface into a series of equilateral spherical triangles.
Geodesic Dome
A circular opening esp. one at the crown of a dome.
Oculus
A superstructure crowning a roof or dome and having open or windowed walls to let in light and air.
Lantern
A light structure on a dome or roof, serving as a belfry, lantern, or belvedere.
Cupola
The vertical part of a cupola.
Tambour
Half a dome formed by a vertical section, such as one over a semicircular apse.
Semidome
A spherical triangle forming the transition from the circular plan of a dome to the polygonal plan of its supporting structure.
Pendentive
An area in the plane of a wall framed by an arch or vault, containing a window, painting or sculpture.
Lunette
A spherical dome formed by removing four segments so that it merges with its pendentives and sits on a square plan.
Pendentive Dome
The space between the inner and outer shells of a dome.
Interdome
A dormer window in a roof or spire.
Lucarne
A space or gallery beneath a dome or vault in which low sounds produced at any of certain points are clearly audible at certain other distant points.
Whispering gallery
A cylndrical or faceted construction, often pierced with windows, supporting a dome.
Drum
The substructure supporting a dome or cupola.
Tholocate
A strap, ring or chain placed around a structure to secure and hold its parts together, as around the springing of a dome.
Bandage
An arch or corbeling built across the upper inside corner of a square tower to support the side of a superimposed octagonal structure.
Squinch
