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The project is a car park building with 18 x 9 m grid of columns. After structural review, we found out that a row of 1m deep x 1.5m wide RC beams at 3m centers were used to span the 18m bays. These beams were resting on a 1m deep x 2m wide RC beam spanning in the 9m direction. The dead of the slab was several time the parking load it was supporting.
Our solution was to provide a 1m deep x 1.2m wide post-tensioned beam to span the 18m bay and a 200mm thick post-tensioned slab in the 8m direction, thus reducing the dead load considerably and achieving major cost savings.
