Fluid were asked to undertake a feasibility study for a new feature staircase in the department store, Lotte, in Seoul, Korea.
The proposed project consisted of two curved staircases which are intertwined but independent of each other and span 26 metres between two floor levels of the department store.
The design of the staircase section was largely governed by the structure’s natural frequency in combination with minimising the dead and live load deflections. Fabricated rectangular hollow sections were adopted for the stringers, with a continuous steel plate spanning between the two sections. The treads and risers comprised tray infill folded plates which allowed for a stone finish and 5kN/m2 live load as required by the Korean code.
The design developed by Fluid was considered to be a more elegant solution than the original Korean engineer’s design and was consequently adopted for construction.