What challenges are presented by cantilevering?
The sight lines and footprint constraints of many stadiums and arenas demand that the leading edge of upper seating tiers extend over the tiers below. Such cantilevering raker and bleacher framing presents designers and builders with special challenges. This problem exists regardless of the choice of support framing material, whether it is precast concrete, cast-in-place concrete or structural steel. In order to maximize construction economy every effort should be made to build a mechanism, prior to the precast’s arrival on site, designed for the stable gravity support of the precast bleacher unit. A detail of a full end support (available in detail section of web site) where the precast is provided with a full end support at the raker beam. From an erector’s perspective this represents the quickest, most efficient framing method. From the precast concrete manufacturer’s standpoint, this is the lightest, most economical “tub” section available framed in single, double or triple riser u
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