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
Justice Facilities | Mar 5, 2015
New courthouse blossoms into a civic space for one California town
The building's canopy suggests classical courthouse features of front porch and portico. It also helps connect the building with a public plaza that has re-centered civic activity and public gathering for the town.
Justice Facilities | Mar 5, 2015
State of the state: How state governments are funding construction projects
State budget shortfalls are making new construction and renovation projects a tough sell, leading lawmakers to seek alternative funding for these jobs.
Museums | Mar 5, 2015
A giant, silver loop in Dubai will house the Museum of the Future
The Sheikh of Dubai hopes the $136 million museum will serve as an incubator for ideas and real designs—a global destination for inventors and entrepreneurs.
Sports and Recreational Facilities | Mar 5, 2015
New HOK designs for St. Louis NFL stadium unveiled
Missouri Governor Jay Nixon has assembled a task force to develop plans for an open-air NFL stadium on the North Riverfront of downtown St. Louis.
Codes and Standards | Mar 5, 2015
Charlotte, N.C., considers rule for gender-neutral public bathrooms
A few other cities, including Philadelphia, Austin, Texas, and Washington D.C., already have gender-neutral bathroom regulations.
Codes and Standards | Mar 5, 2015
FEMA cuts off funding to Indiana after Kokomo continues building stadium in flood zone
FEMA will withhold funding on $5.5 million worth of projects such as building tornado safe rooms in schools.
Reconstruction & Renovation | Mar 5, 2015
Chicago's 7 most endangered properties
Preservation Chicago released its annual list of historic buildings that are at risk of being demolished or falling into decay.
Office Buildings | Mar 5, 2015
Goettsch Partners unveils plans for dual office towers in Warsaw
The Mennica Legacy Tower development is divided into a 35-story tower located on the south east side of the site and a 10-story building on the west side.
Hotel Facilities | Mar 4, 2015
Hotel construction pipeline reaches six-year high
After a three-year bottoming formation, the pipeline for hotel construction has posted five consecutive quarters of double-digit year-over-year growth.
BIM and Information Technology | Mar 4, 2015
Why China's CCTV building needed a WiFi retrofit
It took a year-long retrofit to get WiFi transmission issues solved at China's iconic skyscraper.