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
BIM and Information Technology | Aug 6, 2015
After refueling its capital tank, WeWork acquires BIM consultant Case
The merger is expected to help standardize how WeWork designs and builds out office space.
Giants 400 | Aug 6, 2015
BIM GIANTS: Robotic reality capture, gaming systems, virtual reality—AEC Giants continue tech frenzy
Given their size, AEC Giants possess the resources and scale to research and test the bevy of software and hardware solutions on the market. Some have created internal innovation labs and fabrication shops to tinker with emerging technologies and create custom software tools. Others have formed R&D teams to test tech tools on the job site.
Giants 400 | Aug 6, 2015
GIANTS 300 REPORT: Top 115 Healthcare Architecture Firms
HDR, Stantec, and Perkins+Will top Building Design+Construction's 2015 ranking of the largest healthcare architecture and architecture/engineering firms in the U.S.
Giants 400 | Aug 6, 2015
HEALTHCARE AEC GIANTS: Hospital and medical office construction facing a slow but steady recovery
Construction of hospitals and medical offices is expected to shake off its lethargy in 2015 and recover modestly over the next several years, according to BD+C's 2015 Giants 300 report.
Codes and Standards | Aug 6, 2015
ConsensusDocs releases new CM agency contract standard agreement
For use when owner acts as the construction manager, hires a construction manager, or uses multiple prime contractors
Giants 400 | Aug 5, 2015
GIANTS 300 REPORT: Top 135 Office Sector Architecture Firms
Gensler, HOK, and Perkins+Will top BD+C's ranking of the nation's largest office sector architecture and architecture/engineering firms.
Giants 400 | Aug 5, 2015
OFFICE SECTOR GIANTS: Today’s workplace design must appeal to Millennials’ ‘activity-based’ lifestyle
Office market AEC Giants discuss the latest trends workplace design, and the state of the office construction sector.
Giants 400 | Aug 5, 2015
GIANTS 300 REPORT: Top 37 Engineering/Architecture Firms
Jacobs, AECOM, and Thornton Tomasetti head Building Design+Construction's 2015 ranking of the largest engineering/architecture firms in the United States.
Giants 400 | Aug 5, 2015
ENGINEERING GIANTS: Profits, revenue on the rise at U.S. engineering firms as economy sputters back to life
The vast majority of engineering firms are decidedly bullish on revenue growth for 2015, and profitability is nearing a six-year high, according to BD+C's 2015 Giants 300 report.
Giants 400 | Aug 4, 2015
GIANTS 300 REPORT: Top 64 Architecture/Engineering Firms
Stantec, HOK, and Callison RTKL top Building Design+Construction's 2015 ranking of the largest architecture/engineering firms in the United States.