Material-Saving Freeform Stair

Stairs play an important functional and symbolic role in architecture, where they offer scope for a variety of creative designs, depending on the material. Highly efficient, lightweight freeform stairs in concrete are certainly conceivable but are difficult to realise with conventional formwork.

Material-Saving Freeform Stair
The preassembled and post-tensioned stair is lifted in one piece into position on site. © Georgia Chousou, DBT, ETH Zürich