“We started out with orthogonal grids that might be associated with a stadium or arena roof, with clear visible lines of strength,” Pottinger says. “None of these were acceptable to us or to the architects. We wanted it to look like an artificial sky, a sort of randomness, with no clear lines of strength. What you see today on-site is part artwork, part lighting device, part climate modifier, and part structure.”
Ensuring the strength of the 7,500-ton dome required imposing a clear rule set, along with a bit of software wizardry. After running strength-optimization tests using Autodesk Robot Structural Analysis Professional and other tools, Pottinger’s team linked the dome’s final geometry to Revit to generate drawings showing the size of each individual component—all 11,000 of them. The Austrian company Waagner-Biro managed a complex construction sequence, which spanned five years and required the installation of 120 temporary towers.
“When I walked around the building, in advance of it opening, I could remember going around the model in the same location. It’s like computer gaming, a virtual world, until you walk into it and it becomes real,” Pottinger says.