Genetic Stair

Designed as the centerpiece of a much larger apartment renovation for art collectors on Manhattan’s Upper West Side, this stainless steel stair represents the culmination of a fully integrated generative design process which exploits advanced digital design techniques from the earliest conceptual stages, through performative analysis and onwards to fabrication.

In the search for a final form that inhabits the fecund territory between exuberance and rationality, custom code was developed to marry the generative potential of 3D architectural modeling with the analytic power of structural design software. In an entirely automated evolutionary process, populations of stairs were created in compliance with strict fabrication constraints and then rated for structural performance. Following genetic principles, new generations were produced in which individuals showed stronger and stronger properties until a final design was deemed structurally adequate to connect two floors with no intermediary supports while making three ninety degree turns.

Materially, the stair embodies a restrained palette of polished stainless steel, white translucent Corian and low-iron glass.

The project was designed, detailed, fabricated and installed by Caliper Studio. To learn more about this process, see our fabrication page here or head over to our Flickr site.

To read more about the apartment design, see Home for Two Art Collectors.

 

Structural Engineering:  GMS
Photography:  Ty Cole

 

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Section perspective drawing of the digital model used during design and fabrication. To see the model in three dimensions, please see this animation.

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As seen from the more private bedroom level above, the stair is an almost minimal composition of white translucent treads, stainless steel fittings and low-iron glass.

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Image showing structural connection at base of stair.

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The stair's rectangular landings have no direct support.

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Typical connection detail.

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SECTION DRAWING.3dm

The stair connects a more public dining and entertaining level to the more private bedroom level above.

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The supporting structure is a modified space frame, in which the distribution of the diagonal rod members was determined using custom designed computational algorithms to arrive at a structurally sound solution.

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The stair occupies a square-shaped floor opening that brings in natural light from the large terrace window above.

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Supported only at the top and bottom, the stair turns two hundred seventy degrees and rises fifteen feet.

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Guardrail corner and baluster detail
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Translucent Pivot Doors in open position.
Facade of Nitehawk Cinema and Apartments, designed by Caliper Studio.
'Brushstrokes' and bermed skylights viewed from the black locust deck - Artwork © Estate of Roy Lichtenstein
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The surface effects of the reflective steel are best appreciated in motion. To see a video, please go here.
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