The Skidmore Owings & Merrill LLP (SOM)-designed Zhengzhou Greenland Plaza has opened its doors to its office users. The circular 60-story tower takes its place as the tallest building in the central Chinese city. Located in the northeast portion of Zhengzhou, the 919-feet tower’s circular form is a response to the surrounding development’s shape that centers on a manmade lake.
The 2.59-million-square-feet building houses a mixed-use program of offices on its lower floors and a 416-room hotel above. Daylighting was a key driver of the building’s design. Three- to five-story-tall light-gauge painted aluminum screens are configured at an outward cant that enhances interior daylighting through scientifically calculated reflections while protecting the all-glass exterior from solar gain. The screens provide multiple performance and aesthetic-related roles. The same outward cant that aids daylighting allows for a nuanced approach to artificial lighting, providing outboard locations for dramatic nighttime lighting of the building that make the tower a beacon. The screens are located between one and two-meters from the building’s curtain wall—allowing window washing to occur behind the screens. Their visual porosity varies depending on a viewer’s location. When close to the building’s base, the tower appears to be primarily metal; from a distance, the panels are more open and the building’s glass nature is revealed. The rhythmic cant of the screens, combined with their decreasing size as they rise on the building, creates a dynamic movement that gives the building a fine-grained texture that relates to the building’s humanistic aspirations.
The form of the tower tapers slightly as it rises. “We conceived the building as a classical column,” SOM Design Director Ross Wimer says. “Its iconic image comes from this timeless form—adapted with cutting-edge, 21st century technologies to create a building that expresses our time.” These innovations include a heliostat that crowns the building and reflects daylight throughout the hotel atrium. “Like the solar screening, the heliostat is a scientifically-derived element that enhances the experience of daylight for the building’s users,” Wimer says. The device allows daylight to be reflected and focused into the atrium whose surfaces are finished to help drive light deep into the space. Computer-controlled dimmer switches modulate the light level-based on the illumination provided by the reflector, enabling the atrium to consume less energy and generate less heat throughout the year.
Wimer notes that, while not unheard of, circular skyscrapers remain somewhat unusual. Among the best known examples are Bertrand Goldberg’s Marina City in Chicago, Sir Norman Foster’s 30 St. Mary Axe in London, Jean Nouvel’s Torre Agbar in Barcelona, and Adolf Loos’ unbuilt scheme for the Chicago Tribune Tower. +
Related Stories
Codes and Standards | Feb 6, 2015
Obama executive order requires federal construction projects to consider flood damage caused by climate change
To meet the new standard, builders must build two feet above the currently projected elevation for 100-year floods for most projects.
HVAC | Feb 6, 2015
ASHRAE, REHVA publish guide to chilled beam systems
The guide provides tools and advice for designing, commissioning, and operating chilled-beam systems.
Cultural Facilities | Feb 6, 2015
Under the sea: Manmade island functions as artificial reef
The proposed island would allow visitors to view the enormous faux-reef and its accompanying marine life from the water’s surface to its depths, functioning as an educational center and marine life reserve.
Contractors | Feb 6, 2015
Census Bureau: Capital spending by U.S. businesses increased 4.5%
Of the 19 industry sectors covered in the report, only one had a statistically significant year-to-year decrease in capital spending: the utilities sector.
Warehouses | Feb 5, 2015
Self storage facility designed to blend in with Miami Beach's party scene
The plans by architect Gutierrez & Lozano are of a sleek, boutique-looking, 22,500-sf facility at the gateway to the city.
Sponsored | Designers | Feb 5, 2015
3D printing has people in the building and construction industry talking
How can 3D printing affect the building design and construction industry?
Cultural Facilities | Feb 5, 2015
5 developments selected as 'best in urban placemaking'
Falls Park on the Reedy in Greenville, S.C., and the Grand Rapids (Mich.) Downtown Market are among the finalists for the 2015 Rudy Bruner Award for Urban Excellence.
Architects | Feb 5, 2015
Toy around with Ittyblox's ultra-detailed building blocks
For Lego fanatics, time is no object when building a model. For those of us with a little less time, Ittyblox is a good solution.
Transit Facilities | Feb 4, 2015
London mayor approves plan for a bicycle highway
The plan will guarantee bike riders a designated stretch of street to ride from east to west through the city.
Sports and Recreational Facilities | Feb 4, 2015
Arup unveils plans for the new A.C. Milan stadium
The venue will include a modern stage for the home matches together with a hotel, sports college, restaurants, children’s playground, green areas, and spaces open to the city and dedicated to public use.