Atlantic Station Parking Structure

Location:

Atlanta, GA
 

Owner:

Jacoby Development, Atlanta, GA
 

Architect:

Carl Walker Inc, Atlanta, GA
 

Engineer:

Carl Walker Inc, Atlanta, GA
 

Contractor:

Vratsinas, Atlanta, GA
 

Project Scope

Sq. Footage:

3 million (two- and three-story parking deck plus streets, plazas and foundations for multistory structures)
 

Levels/Floors:

2-story and 3-story structures, 7,000 parking spaces
 

Structural Precast Elements:

4,592 total pieces
• 3,311 precast concrete double tees
• 295 precast concrete columns
• 274 precast concrete girders
• 93 precast concrete shear walls
• 359 precast concrete wall panels
• 257 precast concrete spandrels
 

Precast Specialty Engineer:

PTAC, Pensacola, FL
 

Award:

2006 Precast/Prestressed Concrete Institute (PCI) –
Harry H. Edwards Industry Advancement Award
 
 
 
 
 
 
 
Atlantic Station Parking Structure
Atlantic Station Parking Structure
Atlantic Station Parking Structure
Atlantic Station Parking Structure
 
 
 
 
 
 
 
 
 
 
 
 
 

The precast concrete parking system literally provides a platform for the buildings above it.

Parking Supports Buildings
Perhaps the most intriguing of the projects is the Atlantic Station Parking Structure, built on a 138-acre site formerly occupied by a steel mill. The parking deck, in addition to providing 7,000 parking stalls as well as streets, sidewalks and other spaces, also acts as the base for 10 cast-in-place concrete buildings that rise above street level. The project is the centerpiece for a $2-billion redevelopment project that is turning the once-abandoned site into 15-million square feet of office, retail, residential and hotel space and several acres of public parks.

When completed, the site will include several city blocks of mixed-use urban development. In addition to the parking structure, the project features 6-million square feet of Class A office space, 2-million square feet of retail and entertainment, approximately 4,000 residential units, 1,000 hotel rooms and 11 acres of public parks. Architect and engineer for the massive project is Carl Walker Inc. of Atlanta.

“The precast concrete parking system literally provides a platform for the buildings above it,” says Walker Principal Derrick Bridges. The large parking plate provides an underground superstructure and parking system. The innovative system, which won the Precast/Prestressed Concrete Institute’s Harry H. Edwards Industry Advancement Award last year, includes approximately 3-million square feet of precast concrete superstructure. In addition to providing the foundation for the buildings in the development, the top level of precast also doubles as streets, sidewalk, retail space, plazas and planters.

The system combines moment frames with shear walls that support factory-topped double tees, Bridges says. The use of double tees in the roads required approval from the Georgia Department of Transportation and a sign-off by Georgia’s governor, as it was a first-time application in the state.

The cast-in-place moment frames support precast double tees. Factory topped 10-foot-wide, 26-inch-deep double tees comprise most of the two- and three-level parking areas. Street-level roadways required 12-foot-wide, 47-inch-deep members blocked out to 10 feet wide with an 8-inch-thick concrete composite slab.

The multilevel parking lot, which stretches over several city blocks, provides a base for 10 cast-in-place concrete buildings that rise a typical four stories above the street. Building footprints were segregated from the parking level and roadway structures. This required the precast structures directly below the buildings to be fashioned using a system of precast columns, shear walls and shear-frame structure to support each building. In all, more than 4,500 precast components comprise the structure.

“The project presented a unique design challenge,” says Bridges. “The buildings were actually designed after we completed plans for the parking structure. This required that we come up with assumed design loads and lateral loads from the onset of the project.” All of the buildings are composed of efficient cast-in-place concrete moment frames with semi-lightweight (120 pcf) cast-in-place concrete. This minimized the mass of the buildings and thus allowed the design approach for the supporting precast structure.

Precast concrete’s speed of erection, as well as the cost impact, played major roles in the decision to use the material for the parking structure.

The project is not yet complete, Bridges notes. Plans are now being formulated to add another such parking structure with perhaps as many as 7,000 additional parking spaces to the site north of the Georgia Tech campus. Among the buildings still under the planning stage is a 44-story Atlantis hotel.

Although few projects around the country are quite this extensive in their use of precast concrete parking structures, more such mixed-use designs are looking at precast as a strong option. Whether adding retail into parking, using parking as a complement or building retail and other buildings on top of the parking structure, precast concrete provides a variety of benefits that are making it a strong choice in a wide range of designs.

 
Back to