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
| Apr 19, 2012
KTGY Group’s Arista Uptown Apartments in Broomfield, Colo. completed
First of eight buildings highlights unique amenities.
| Apr 19, 2012
Nauset begins work on $20M Joint Forces HQ at Hanscom AFB
3D imaging key to project timetable and cost containment.
| Apr 19, 2012
HBD Construction names Steven Meeks vice president
Meeks will provide expertise for the company in its many diverse areas of construction projects including health care, senior living, education and retail.
| Apr 18, 2012
Lafarge moving North American headquarters to Illinois
Lafarge CEO John Stull says the factors in their decision were location in the Midwest and area transportation.
| Apr 18, 2012
Positive conditions persist for Architecture Billings Index
The AIA reported the March ABI score was 50.4, following a mark of 51.0 in February; greatest demand is for commercial building projects.
| Apr 18, 2012
Syska Hennessy re-launches Information and Communication Technology practice
The ICT practice will focus a blend of products including Information Technology, Security, Audiovisual, Building Automation, Fire Life Safety, Medical Communications and Intelligent Building Systems.
| Apr 18, 2012
Perkins+Will designs new complex for Johns Hopkins Hosptial
The Charlotte R. Bloomberg Children’s Center and the Sheikh Zayed Tower create transformative patient-centric care.
| Apr 18, 2012
BBS Architects & Engineers acquires Ward Associates
The merged companies’ on-going project portfolio valued at $220 million.
| Apr 17, 2012
Princeton Review releases “Guide to 322 Green Colleges”
The guide profiles 322 institutions of higher education in the U.S. and Canada that demonstrate notable commitments to sustainability in their academic offerings, campus infrastructure, activities and career preparation.
| Apr 17, 2012
FMI report examines federal construction trends
Given the rapid transformations occurring in the federal construction sector, FMI examines the key forces accelerating these changes, as well as their effect on the industry.