ClientRestruction Corporation and CORE Construction
BackgroundThe 72,000-spectator capacity Sun Devil Stadium at ASU is a large, U-shaped structure with lower and upper stands. The stadium was built in 1976 and upgraded in 1988. It features precast concrete bleachers supported by steel girders and beams on steel concrete columns. The concourse level below the upper stand is a topped, hollow-core deck supported on steel brackets welded to floor beams. The concourse is located between 30 and 60 feet above ground level.
SolutionWJE engineers performed a document review and structural analysis of the steel frames supporting the upper and lower stands. The upper stand structure was determined to have sufficient capacity to lift the concourse decks. Steel brackets were welded to the steel girders of the upper deck, and tension cables were hung to the concourse level. There, portable hollow structural steel tubes and hydraulic jacks were used to couple steel saddles installed under the concourse framing. Controlled lifting of the concourse decks was accomplished with calibrated hydraulic rams and loaded cells.
Disruptions to stadium operations on the concourse level were minimized, and the grounds and kitchens remained open at all times.