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
Architects | Apr 14, 2016
You can watch over 50 architectural documentaries on YouTube for free
The Arts & Culture Bureau YouTube channel offers architectural documentaries about structures and works that span thousands of years and dozens of locations
Senior Living Design | Apr 14, 2016
Creating a home for eldercare using the ‘Green House’ design concept
VOA Associates’ Douglas King offers design considerations in implementing the Green House concept in eldercare for continuing care retirement communities.
Industrial Facilities | Apr 13, 2016
Ford begins 10-year plan to centralize Dearborn, Mich., campus
The company said that it will rebuild 7.5 million sf of work space over a 10-year period, which will shift 30,000 employees from 70 buildings now into two primary locations.
Building Tech | Apr 12, 2016
Should we be worried about a tech slowdown?
Is the U.S. in an innovative funk, or is this just the calm before the storm?
Multifamily Housing | Apr 7, 2016
Multifamily and Specialized Housing projects honored in 2016 AIA Housing Awards
A San Francisco low-income mixed-use complex, a Los Angeles homeless veterans housing facility, and a series of student residential buildings at UMass were among the winners.
Green | Apr 4, 2016
AIA report analyzes 20 years of the best green projects
"Lessons from the Leading Edge" is a study of the 200 Committee on the Environment (COTE) Top Ten Award winning projects since 1997.
Architects | Apr 1, 2016
Adrian Smith earns UIC’s Legacies and Leaders Award
The Chicago architect graduated from the school and created a scholarship for aspiring architects.
Architects | Mar 31, 2016
Zaha Hadid dies at 65
Often credited as being a pioneer for women architects for her work in a male-dominated field, Hadid had designs commissioned around the world from London to Hong Kong to Cincinnati.
Architects | Mar 31, 2016
Auto-shading windows and point-of-decision design are among the research projects to receive AIA funding grants
Firms represented by the projects and initiatives receiving grants include HKS, DO|SU Studio Architecture, and McClain + Yu Architecture and Design.
Hotel Facilities | Mar 30, 2016
The Usonian Inn, a Frank Lloyd Wright-inspired motor lodge, is on the market for $665,000
The Usonian Inn proudly displays many Wright-inspired characteristics, the most prominent of which is the use of cantilevered overhangs.