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
| Nov 2, 2010
Energy Analysis No Longer a Luxury
Back in the halcyon days of 2006, energy analysis of building design and performance was a luxury. Sure, many forward-thinking AEC firms ran their designs through services such as Autodesk’s Green Building Studio and IES’s Virtual Environment, and some facility managers used Honeywell’s Energy Manager and other monitoring software. Today, however, knowing exactly how much energy your building will produce and use is survival of the fittest as energy costs and green design requirements demand precision.
| Nov 2, 2010
Yudelson: ‘If It Doesn’t Perform, It Can’t Be Green’
Jerry Yudelson, prolific author and veteran green building expert, challenges Building Teams to think big when it comes to controlling energy use and reducing carbon emissions in buildings.
| Nov 2, 2010
Historic changes to commercial building energy codes drive energy efficiency, emissions reductions
Revisions to the commercial section of the 2012 International Energy Conservation Code (IECC) represent the largest single-step efficiency increase in the history of the national, model energy. The changes mean that new and renovated buildings constructed in jurisdictions that follow the 2012 IECC will use 30% less energy than those built to current standards.
| Nov 1, 2010
Sustainable, mixed-income housing to revitalize community
The $41 million Arlington Grove mixed-use development in St. Louis is viewed as a major step in revitalizing the community. Developed by McCormack Baron Salazar with KAI Design & Build (architect, MEP, GC), the project will add 112 new and renovated mixed-income rental units (market rate, low-income, and public housing) totaling 162,000 sf, plus 5,000 sf of commercial/retail space.
| Nov 1, 2010
John Pearce: First thing I tell designers: Do your homework!
John Pearce, FAIA, University Architect at Duke University, Durham, N.C., tells BD+C’s Robert Cassidy about the school’s construction plans and sustainability efforts, how to land work at Duke, and why he’s proceeding with caution when it comes to BIM.
| Nov 1, 2010
Vancouver’s former Olympic Village shoots for Gold
The first tenants of the Millennium Water development in Vancouver, B.C., were Olympic athletes competing in the 2010 Winter Games. Now the former Olympic Village, located on a 17-acre brownfield site, is being transformed into a residential neighborhood targeting LEED ND Gold. The buildings are expected to consume 30-70% less energy than comparable structures.
| Oct 27, 2010
Grid-neutral education complex to serve students, community
MVE Institutional designed the Downtown Educational Complex in Oakland, Calif., to serve as an educational facility, community center, and grid-neutral green building. The 123,000-sf complex, now under construction on a 5.5-acre site in the city’s Lake Merritt neighborhood, will be built in two phases, the first expected to be completed in spring 2012 and the second in fall 2014.
| Oct 21, 2010
GSA confirms new LEED Gold requirement
The General Services Administration has increased its sustainability requirements and now mandates LEED Gold for its projects.
| Oct 18, 2010
World’s first zero-carbon city on track in Abu Dhabi
Masdar City, the world’s only zero-carbon city, is on track to be built in Abu Dhabi, with completion expected as early as 2020. Foster + Partners developed the $22 billion city’s master plan, with Adrian Smith + Gordon Gill Architecture, Aedas, and Lava Architects designing buildings for the project’s first phase, which is on track to be ready for occupancy by 2015.
