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The building is a 4 story rectangular donut shaped building having an interior courtyard and a full basement, including below the courtyard. There is also an attached 3 story underground concrete parking structure. The building has an area of approximately 300,000 square feet of structural lightweight concrete on metal deck and composite steel beams. The lateral forces are resisted by steel moment frames, steel concentric braced frames, or concrete shear walls.
A few reasons for choosing structural lightweight concrete include the following:
1. Lighter vertical dead load.
2. Reduced seismic loads resisted by the frames and shear walls.
3. Greater fire rating with thinner slabs.
§ 4000 psi Structural Lightweight Concrete
§ 110 lbs. cu. ft. +/- 3 lbs @ 28 days
§ 6% +/- 1.5 Air Entrainment
§ 2 Hr. UL Fire Rating
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