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 27, 2011
USGBC’s Center for Green Schools releases Best of Green Schools 2011
Recipient schools and regions from across the nation - from K-12 to higher education - were recognized for a variety of sustainable, cost-cutting measures, including energy conservation, record numbers of LEED certified buildings and collaborative platforms and policies to green U.S. school infrastructure.
| Dec 21, 2011
DOE report details finance options for PV systems in schools
The report examines the two primary types of ownership models used to obtain PV installations for school administrators to use in selecting the best option for deploying solar technologies in their districts.
| Dec 21, 2011
AIA Chicago & AIA Chicago Foundation 2011 Dubin Family Young Architect Award announced
The Dubin Family Young Architect Award is bestowed annually and recognizes excellence in ability and exceptional contributions by a Chicago architect between the ages of 25 and 39.
| Dec 21, 2011
Few silver linings for construction in 2012
On the brighter side, nearly half of respondents (49.7%) said their firms were in at least “good” financial health, and four-fifths (80.2%) said their companies would at least hold steady in revenue in 2012.
| Dec 21, 2011
Hoboken Terminal restoration complete
Restoration of ferry slips, expanded service to benefit commuters.
| Dec 21, 2011
BBI key to Philly high-rise renovation
The 200,000 sf building was recently outfitted with a new HVAC system and a state-of-the-art window retrofitting system.
| Dec 20, 2011
Gluckman Mayner Architects releases design for Syracuse law building
The design reflects an organizational clarity and professional sophistication that anticipates the user experience of students, faculty, and visitors alike.
| Dec 20, 2011
Research identifies most expensive U.S. commercial real estate markets
New York City, Washington, D.C. and San Mateo, Calif., rank highest in rents.
| Dec 20, 2011
Third annual Gingerbread Build-off winners announced
Nine awards were handed out acknowledging the most unique and creative gingerbread structures completed.
| Dec 20, 2011
BCA’s Best Practices in New Construction available online
This publicly available document is applicable to most building types and distills the long list of guidelines, and longer list of tasks, into easy-to-navigate activities that represent the ideal commissioning process.