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Thinking out of the box

New Concrete Engineering

The longitudinal cantilevers take the form of two 'boxes' which extend at angles to the slab. Rebars were placed at various different levels as the directions of the rebar of the main slab and the boxes were not in parallel.

Four inclined steel columns provide additional support. These are bolted to a 45mm thick embedded plate via a prism-shaped monolithically formed dropout. To transfer forces from the column, four levels of T16 steel bursting bars (six per level) extend from the plate into the dropout which counteract the horizontal shear force.

Eight levels of four sets of T16 shear u-bar links emerge horizontally from the main slab and bend to cross the bursting bars forming a mesh.

In addition, three horizontal layers of 25mm Macalloy 500 bars help anchor the 750mm box cantilevers to the main structure crossing at an angle, with dense layers of reinforcement where the slab depth thins from 1,300mm to 750mm.

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