the geometry of this framework is based again on a one-frequency dodecahedral tensegrity.  this one is a much cheaper & easier method than EMT conduit struts, and more permanent...

for this dome, steel rebars are curved into 5 great semi-circles, with a tail at each end for ground connection.  two more rebars with the same curvature (and no tails) are welded together to make up the great-circular base of the dome.

the overall size is easily scalable.  in this example (for ranjit) we'll start with 40-foot lengths of 1/2-inch rebar, and a great-circle circumference of 70 feet, giving a dome radius/height of approx 11 feet, diameter approx 22 feet, and floor area of 390 'square' feet.  the pentagonal and triangular faces will have 7-foot curved sides.

each arch is divided into 5 sections of 7 curved feet (plus a 2.5-foot tail at each end).  pairs of arches will meet at these section dividers, where they can be welded together. (exactly two rebars will cross at each vertex)

the pentagonal faces (especially the roof) can then be subdivided / stellated as necessary with shorter sections of curved rebar struts welded at vertexes of the main frame arches.

for some ideas & methods of covering this frame, see other dome pages, below.  my next dome project is a rebar greenhouse, wrapped with 6-inch-square fencing to make a grapevine arbor for shade & shelter in the arizona desert...