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Composition of Structure
Composition of Structure
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Composition of Structure
This project makes use of a multi-layered structuralsystem. Conical section glulam arches carry vertical loads from thesteel diagrid shell. The bays are divided into small, medium and large spans. Three categories dictate a different number of diagrid divisions as well as the number of slits in the shell. These slits are then given a crescent truss geometry to help the diagrid carry the load over the larger spans. These crescent slits also serve to bring northeastern light into the building. At the valleys of each bay, the diagrid transitions into a trussed beam which spans between the conical section glulam members. The depth of these trussed beams is given by a proportional relationship to the span. Vertical loads transfer from steel diagrid to steel truss to glulam conical section members. Horizontal forces in the primary direction are resisted primarily by the glulam members, which act as a portal frame. Horizontal forces in the secondary direction are resisted by the combination of sheer walls between glulam members and trussed steel beams which gain depth at their ends to provide moment support. Mezzanine and showroom floors are suspended on tension cables attached to elliptical steel tubes. Experientially, the space is organized with a directional bias. In one direction, the glulam conical sections read with thickness as graphic profiles. In the secondary direction, the glulam members are thin and read as thin lines. Shear walls and steel trusses also respond to this directional bias emphasizing thinness or graphic thickness. Lightstreaming in from the crescent slits in the envelope and the design of curvilinear stair runners reinforce the graphic quality of the conical section’s continuous curvature.
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