Thornton Tomasetti provided structural design for this Mission Revival
administration building that features archways, colonnades, plazas, and an
85-foot tall domed clock tower.
Several towers, including the main entryway clock tower, are steel framed
with Special Concentrically Braced Frames (SCBF) with columns supported
on deep transfer girders situated on the floors below. Because of the
atypically shaped floor plates, structural diaphragms were strengthened at
critical areas. The structural frame includes metal deck with concrete floor
and roof decks supported by steel wide flange beams, girders, and columns.
Concrete shear walls make up the lateral seismic resisting system, which are
supported on concrete grade beam footings at the ground level.
The new civic center features an advanced Indirect Direct Evaporative
Cooling (IDEC) HVAC system that pumps in outside air to improve inside
breathing quality. Thornton Tomasetti’s coordination with the mechanical
engineer was critical in order to provide a roof framing system stiff enough to
prevent unwanted vibration of the sensitive HVAC units.
Once completed, the building’s use of local materials, low-flow water fixtures
and daylighting will assure the project receives a minimum LEED Silver certification.