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 9, 2012
Thornton Tomasetti acquires green consulting firm Fore Solutions
International engineering firm launches new building sustainability practice.
| Jan 9, 2012
METALCON International 2012 announced
METALCON 2012 is scheduled for Oct. 9-11 at the Donald E Stephens Convention Center, Hall A, Rosemont, Ill.
| Jan 9, 2012
Lutron appoints Pessina president
In his 35-year career with Lutron, Pessina has acquired broad experience in the engineering, quality assurance and manufacturing areas.
| Jan 9, 2012
A new journey for KSS Architects co-founder
Kehrt's legacy of projects include Rutgers University's Biomedical Engineering Building, the renovation and expansion of Cornell University School of Hotel Administration, the recent new campus center at The Richard Stockton College of New Jersey and Princeton Township's Municipal Complex.
| Jan 8, 2012
TCA releases The Construction of Tilt-Up
The newest publication from the TCA is the second in a planned trilogy of resources covering the architecture, engineering and construction of Tilt-Up
| Jan 8, 2012
WHR Architects promotes Joel Colwell, AIA, to principal
With over 30 years of experience, Colwell has managed large-scale, complex projects for major healthcare systems as well as challenging smaller renovations and additions — all with notable success.
| Jan 6, 2012
Doug Wignall named president of HDR Architecture
HDR Architecture, Inc. is known for its award-winning designs for urban environments, campuses and buildings in the healthcare, science and technology, civic, justice and higher education markets.
| Jan 6, 2012
Gensler unveils restoration and expansion of Houston's Julia Ideson building
The "new" building will serve as a repository of Houston memorabilia and rare archival material as well as the city's official reception space and a venue for exhibits, meetings and other special events.
| Jan 6, 2012
New Walgreen's represents an architectural departure
The structure's exterior is a major departure from the corporate image of a traditional Walgreens design.