The signature bridge's Vierendeel truss
structure provides unobstructed vistas and safe, private, and comfortable passage for patients and staff on its upper level and general pedestrian passage on its lower level.
For example, the structural system to support the building above the existing loading dock was originally envisioned using a vierendeel truss
system with additional oversized wide flange beam members.
The whole wall acts structurally like a species of Vierendeel truss
, but it is made magic by its glazing.
Each cantilevered girder is propped towards its outer end on an inclined steel post that tapers at both ends, and these are linked by horizontal tubular members and diagonal bracing to form what is in effect a gigantic Vierendeel truss
that runs along the whole south side of the building and also carries the glass.
Between these columns spans a 2.5m tall Vierendeel truss
which facilitates the change in grid between the new and existing columns and avoids diagonal bracing in what is essentially a clerestory.