Abstract: A mega stadium-convention center complex is disclosed comprising an impressive pyramid building with a 670-foot pinnacle and a base covering more than 20 acres. The complex contains a 60,000-seat football stadium with a central playing field located more than 180 feet above the ground. The four-sided pyramid can be clad in tinted reflective glass or the like and has 8 or more floors below the playing field that provide several million square feet of floor space for a variety of different business and entertainment facilities. The pyramid roof structure above the stadium and the playing field is adjustable and convertible and includes more than a dozen narrow retractable roof panels or strips and associated guide rails.

Abstract: A sports stadium or building complex is covered by a huge fiberglass fabric dome that is supported by an inflatable dual-membrane bladder on a hollow compression ring with a diameter of 800 to 1200 feet. A central vertical spreader having upper and lower tension rings connected to the membranes of said bladder is supported from above or below by separate suspension cables in a position above the compression ring. Containment cables limit the expansion of and shape said bladder to provide a closed pressurized air space of narrow lenticular cross section and can include 40 or more radial ceiling cables and the same number of radial hold-down cables of the same length.