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🏛️ How a dome carries its own weight

Slice a dome through the middle and you find an arch; spin that arch and the weight suddenly has somewhere else to go. Follow it down through meridians, hoops and tension rings to the one place a dome is always trying to fail — the base, wh

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. Shape makes a shellExplain how curvature and repeated arches let a dome carry load through a three-dimensional shell.A dome's curve is a structural route, and a geodesic frame approximates that shell with triangles.
  2. Rings hold the curve togetherDistinguish meridional and hoop forces, and explain why the base of a dome needs restraint.Force travels in two directions, and rings, walls, ties and buttresses manage the outward push at the bottom.
  3. Lightness is part of strengthConnect changing thickness, coffers, openings and shell efficiency to the forces a dome has to carry.Removing weight lowers demand, but every recess and opening has to leave a workable path behind.
  4. Building changes the forcesExplain why connections, foundations, construction sequence and soil belong to a dome's structural story.A dome carries its own weight through a complete, supported system that runs from the crown to the ground.

Questions this course answers

Why can a curved dome cover a broad space efficiently?

Curvature lets the surface carry load along itself, in compression and tension, rather than resisting bending across the span.

What problem does a tension ring at a dome's base help solve?

Lower down, a masonry dome pushes outward on its rings; a continuous ring gathers that push as tension.

Put this dome load path in order.

Weight travels through the curved surface and its rings, into the supports, and only then into the ground.

Why can the order of construction decide whether a dome stands up?

The finished shape is only the last of many structural states, and it is not always the most dangerous one.

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