Reinforced concrete slabs are supported by columns or load-bearing walls. Flat slabs are supported by columns with capitals and/or drop panels, while flat plates are supported by columns without capitals. This floor system also includes waffle slabs without beams. Slabs or plates can be post-tensioned.

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Waffle slab concrete construction, post office building, Canada (S. Brzev)

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Flat plate concrete construction, parking garage, USA (S. Brzev)

Reinforced concrete flat slab system with capitals, UK (S. Brzev)

Reinforced concrete flat slab system with capitals, UK (S. Brzev)

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Floor slab system consisting of cast-in-place reinforced concrete voided with concrete blocks was observed in Haiti after the 2010 earthquake (top photo - A. Irfanoglu and bottom photo - A. Lang)