Abstract: This invention provides for a multi-purpose stadium which includes a first activity area having a natural turf playing field and a second activity area positioned below the first activity area. The first activity area is supported on a platform vertically movable with respect to the second activity area allowing for spectator sightlines to be satisfied for events occurring within the first and second activity areas. The first activity area is supported within the stadium by a plurality of piers. Each pier includes a hollow column with a continuous slot on the interior face thereof which supports a hydraulic lifting device. The hydraulic lifting devices vertically move the first activity area relative to the second activity area. Alternatively, a counterweight system may be employed to lift the first activity area.

Abstract: A super high-rise tower is disclosed which is formed from a central rigid core supported by a pretensioned cable network.

Abstract: A cable truss dome which is not triangulated is constructed from a plurality of cables under tension and compression members arranged in triangles having non-common sides. The cable truss dome is adapted for spanning large areas where the cables form a low shallow arch which supports a flexible membrane as a covering. The non-common vertex of the formed triangles are connected to similarly placed vertical sides of other triangles through continuous nested tension rings.

Abstract: A composite roof membrane for use in air supported and/or tensioned roof structures comprises an interior vapor barrier formed of a scrim reinforced thin film material, an intermediate layer of translucent flexible insulation, and an outer layer of liquid impervious but vapor porous fabric.

Abstract: A floor-ceiling system for multi-story buildings which utilizes a bottom membrane having significant tensile strength supported on the building frame, such membrane being either cast in place and supported by shoring or prefabricated and self-supported, with void-producing duct forms regularly arranged and supported on the membrane, and a poured-in-place plastic material covering the membrane and duct forms to create structural elements alternating with the duct forms to form a substantially finished floor-ceiling system when the plastic material cures. The duct forms may be provided with access openings to the floor or ceiling or with lateral access openings interconnecting each other. The duct forms may be left-in-place forms or inflatable tubes removed when deflated after the material cures. Finishing materials for the floor or ceiling such as carpeting or acoustical tile may be secured directly to the essentially planar bottom or top surface of the system.

Abstract: A composite sheet for use in membrane type roof constructions or the like comprises a foraminous web formed of a plurality of fibers coated or impregnated with a heat sealable plastic material and being heat sealed to a compatible thin film of plastic sheet material. The thin film sheet material is preferably transparent, so that the composite sheet is transparent through the openings in the foraminous web.