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
| Dec 8, 2014
AEC firms upbeat about financial results, 2015 looking rosier [exclusive BD+C survey]
The market outlook is brighter for U.S. architecture, engineering, and construction companies, with a majority of AEC firms reporting higher revenues, strong forecasts, and sound financial health, according to BD+C's annual Market Forecast Survey.
| Dec 8, 2014
The global sanitation crisis leads to 2.5 million deaths every year
When we see the incredible technology being produced by global plumbing manufacturers, it’s hard to conceive why no viable technical solution to the global sanitation issue has come forth, writes BD+C's Robert Cassidy.
| Dec 8, 2014
Moshe Safdie wants to reinvent airports with Jewel Changi Airport addition
A new addition to Singapore's Changi Airport, designed by Moshe Safdie, will feature a waterfall and extensive indoor gardens.
| Dec 6, 2014
Future workplace designs shouldn’t need to favor one generation over another, says CBRE report
A new CBRE survey finds that what Millennials expect and need from offices doesn’t vary drastically from tenured employees.
| Dec 5, 2014
Plotting on the go: 3D-printed mechanical compass can print CAD drawings with high precision
Design student Ken Nakagaki has adapted a device to work with CAD software to replicate digital files on paper.
Sponsored | | Dec 5, 2014
New construction outlook report projects growth in 2015
A new 2015 construction outlook report predicts that total U.S. construction starts for 2015 will rise 9% to $612 billion. SPONSORED CONTENT
Sponsored | | Dec 5, 2014
Best practices for force transfer around openings
As wood-frame construction is continuously evolving, designers in many parts of the U.S. are optimizing design solutions that require the understanding of force transfer between elements in the lateral load-resisting system.
| Dec 4, 2014
World’s largest eco-resort to open soon in Indonesia
Just under 10 miles away from Singapore, Funtasy Island (yes, that's the real name) is a resort tucked away in the mangrove islands of the Riau archipelago.
| Dec 4, 2014
£175 million 'Garden Bridge' gets the green light to cross the Thames
Westminster Council has approved a £175 million 'Garden Bridge' that will allow pedestrian traffic only. There has been some controversy about this bridge, which is expected to attract seven million visitors annually.