Designed in 1991, the 45,000 square foot main entrance and theater wing is a 200-foot by 180-foot structure connecting the exhibition halls. Unique with no right angles, the building has fifteen sides which encapsulate a 530 seat IMAX theater plus additional exhibition space.
The roof of this structure has two levels - one at 40-feet and the other at 70-feet above grade.
Beyond the high roofed theater there are only four interior columns. These interior columns support the roof and are for gravity loads only.
The perimeter walls are braced tubular frames and the top of these walls are connected to the low roof structure which is a horizontal diaphragm. The roof diaphragm spans about the five skylight clusters.
The structural system was analyzed as a three-dimensional braced frame using SAP.