Wilshire Grand Center in Los Angeles. Len Joseph / Thornton Tomasetti (left) and Bess Adler / Thornton Tomasetti (right).
The new Wilshire Grand Center will completely redefine the Los Angeles skyline. Located on the site of the recently demolished Wilshire Grand Hotel, the tower will be the tallest building in the Western United States. Reaching 73 stories and topped by an LED-illuminated, sail-shaped architectural feature, Wilshire Grand will house a four-star hotel on the upper floors and Class-A offices on the lower floors. A five-story podium will include retail and dining options and the building will offer five levels of subterranean parking. An upscale rooftop “sky lobby” will provide guests with sweeping views of Los Angeles that extend to Santa Monica.
Thornton Tomasetti provided structural engineering and performance-based design services to engineer-of-record Brandow & Johnston. The tower’s superstructure lateral system consists of a nearly rectangular four-cell cast-in-place reinforced concrete shear wall system supplemented by outriggers in the transverse direction with buckling restrained brace (BRB) diagonals for well-controlled wind and seismic performance. The gravity system consists of concrete-filled metal deck floor slabs supported by composite steel wide-flange framing. Thornton Tomasetti applied performance-based design principles to validate the tower’s seismic performance and successfully presented the design to the Building Department’s Peer Review Panel.
Thornton Tomasetti also established a parametric façade panelization strategy for the geometrically complex, all-glass façade. Contracted by AC Martin Partners, Thornton Tomasetti synchronized slab and façade geometry between the architect’s Rhino and Revit models and used the combined data to generate two Revit models: one for the architect’s documentation of the façade panelization, and the other with information needed for the façade consultant.
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