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
| Jan 30, 2014
Mayors of 10 metros unite to cut building-related climate pollution
Organizers say combined initiative could cut as much climate-change pollution as generated by 1 million cars every year, and lower energy bills by nearly $1 billion annually.
| Jan 30, 2014
See how architects at NBBJ are using computational design to calculate the best views on projects [video]
In an ideal world, every office employee would have a beautiful view from his or her desk. While no one can make that happen in real life, computational design can help architects maximize views from every angle.
| Jan 30, 2014
The evolving workplace: One designer's inspiration board
"Open office" has been a major buzzword for decades, and like any buzzword, some of the novelty has worn off. I don't believe we will abandon the open office, but I do think we need to focus on providing a dynamic mix of open and closed spaces.
| Jan 30, 2014
How reverse engineering nature can spur design innovation
It’s not enough to copy nature. Today’s designers need a deeper understanding of environmental nuance, from the biome in.
| Jan 30, 2014
What to expect in the metal building industry in 2014
Every year brings changes. This one won’t be any different. We’ll see growth in some areas, declines in others. Here’s a little preview of what we’ll be writing about 2014 when 2015 comes rolling in.
| Jan 30, 2014
What's in store for healthcare capital markets in 2014?
Despite the shake up stemming from the Affordable Care Act, 2014 will be an active year in healthcare capital markets, according to real estate experts from CBRE Healthcare.
| Jan 29, 2014
Richard Meier unveils 'urban courtyard' scheme for Mexico City towers
A grand atrium, reaching some 30 stories, highlights the contemporary, bright-white design scheme unveiled this week by Richard Meier & Partners for a new mixed-use development in Mexico City.
| Jan 29, 2014
Historic church will be part of new condo building in D.C.
Sorg Architects unveiled a design scheme for 40 condos in a six-story building, which will wrap around an existing historic church, and will itself contain four residential units.
| Jan 29, 2014
Hotel, retail, recreation sectors to lead growth in 2014
AIA's Consensus Construction Forecast, a survey of the nation’s leading construction forecasters, is projecting that spending will see a 5.8% increase in 2014, led by the hotel, retail, and amusement/recreation sectors.
| Jan 29, 2014
Notre Dame to expand football stadium in largest project in school history
The $400 million Campus Crossroads Project will add more than 750,000 sf of academic, student life, and athletic space in three new buildings attached to the school's iconic football stadium.