A supporting framework in a building formed with diagonally intersecting ribs of metal or concrete.
- Within the principal diagrid established by the 36 steel columns that spiral around building (which form an independent self-bracing structure), each floor level is broken down into 72 five-degree modules.
- Because of the inherent stiffness of the external diagrid, the central core is required to act only as a load-bearing element and is free from diagonal bracing, producing more flexible floor plates.
- Ends of the shell are stiffened with laminated timber arches braced by a diagrid of tension cables from which hang enclosing cardboard honeycomb panels.
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