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 13, 2010
Energy efficiency No. 1 priority for commercial office tenants
Green building initiatives are a key influencer when tenants decide to sign a commercial real estate lease, according to a survey by GE Capital Real Estate. The survey, which was conducted over the past year and included more than 2,220 office tenants in the U.S., Canada, France, Germany, Sweden, the UK, Spain, and Japan, shows that energy efficiency remains the No. 1 priority in most countries. Also ranking near the top: waste reduction programs and indoor air.
| Dec 7, 2010
Are green building RFPs more important than contracts?
The Request for Proposal (RFP) process is key to managing a successful LEED project, according to Green Building Law Update. While most people think a contract is the key element to a successful construction project, successfully managing a LEED project requires a clear RFP that addresses many of the problems that can lead to litigation.
| Dec 7, 2010
Blue is the future of green design
Blue design creates places that are not just neutral, but actually add back to the world and is the future of sustainable design and architecture, according to an interview with Paul Eagle, managing director of Perkins+Will, New York; and Janice Barnes, principal at the firm and global discipline leader for planning and strategies.
| Dec 7, 2010
Green building thrives in shaky economy
Green building’s momentum hasn’t been stopped by the economic recession and will keep speeding through the recovery, while at the same time building owners are looking to go green more for economic reasons than environmental ones. Green building has grown 50% in the past two years; total construction starts have shrunk 26% over the same time period, according to “Green Outlook 2011” report. The green-building sector is expected to nearly triple by 2015, representing as much as $145 billion in new construction activity.
| Dec 7, 2010
USGBC: Wood-certification benchmarks fail to pass
The proposed Forest Certification Benchmark to determine when wood-certification groups would have their certification qualify for points in the LEED rating systemdid not pass the USGBC member ballot. As a result, the Certified Wood credit in LEED will remain as it is currently written. To date, only wood certified by the Forest Stewardship Council qualifies for a point in the LEED, while other organizations, such as the Sustainable Forestry Initiative, the Canadian Standards Association, and the American Tree Farm System, are excluded.
| Dec 7, 2010
Prospects for multifamily sector improve greatly
The multifamily sector is showing signs of a real recovery, with nearly 22,000 new apartment units delivered to the market. Net absorption in the third quarter surged by 94,000 units, dropping the national vacancy rate from 7.8% to 7.1%, one of the largest quarterly drops on record, and rents increased for the second quarter in a row.
| Dec 7, 2010
Hot rumor: Norman Foster designing Apple’s new campus
Lord Norman Foster, reportedly has been selected to design Apple’s new campus in Cupertino, Calif. If the news is true, Foster is a good match for Apple say experts. Foster built his celebrity by marrying big gestures to technological wizardry. And, unlike some starchitects, he has glommed onto the environmental revolution—something Apple has made a point of embracing, too.
| Dec 7, 2010
10 megacities of the near future
With Beijing, Shanghai, and Mumbai already on the global radar, where can the next wave of construction be found? Far beyond China, India, and even Brazil it’s predicted. The world’s next future megacities could include Istanbul, Turkey; Ho Chi Minh City, Vietnam; and Khartoum, Sudan, among others. Read about these emerging and little-known behemoths.
