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
Great Solutions | Aug 23, 2016
11 great solutions for the commercial construction market
A roll-up emergency department, next-gen telemedicine center, and biophilic cooling pods are among the AEC industry’s clever ideas and novel innovations for 2016.
| Aug 19, 2016
RECONSTRUCTION GIANTS: Facelifts give buildings new identities, even as they keep a few wrinkles
Reconstruction is always a balancing act between the client’s pro forma and what the building needs to be vibrant again.
| Aug 19, 2016
Top 130 Reconstruction Architecture Firms
The Beck Group, Stantec, and IMC Consruction top Building Design+Construction’s annual ranking of the nation’s largest reconstruction sector architecture and A/E firms, as reported in the 2016 Giants 300 Report.
| Aug 18, 2016
LOCAL GOVERNMENT GIANTS: A ranking of the nation’s top design and construction firms in local sector work
HOK, Stantec, Turner Construction Co.,Clark Group, AECOM and STV top Building Design+Construction’s annual rankings of the nation’s largest local government sector AEC firms, as reported in the 2016 Giants 300 Report.
| Aug 18, 2016
STATE GOVERNMENT GIANTS: A ranking of the nation’s top design and construction firms in state sector work
CannonDesign, Stantec, Turner Construction Co.,Mortensen Construction, WSP | Parsons Brinckerhoff and AECOM top Building Design+Construction’s annual rankings of the nation’s largest state government sector AEC firms, as reported in the 2016 Giants 300 Report.
Hotel Facilities | Aug 17, 2016
First of its kind tri-branded Marriott hotel under construction in downtown Nashville
The hotel will combine the AC Hotels, Residence Inn, and SpringHill Suites brands.
University Buildings | Aug 16, 2016
New images of Rice University’s Moody Center for the Arts revealed by Michael Maltzan Architecture
The arts center will foster creativity for making and presenting works across all disciplines
Designers | Aug 16, 2016
CCDI, Morphosis, and Diller Scofidio + Renfro are among ten finalists vying for Chinese Eco-Island design
The winning firm will design the master plan and central buildings for the man made Haikou Bay island.
Mixed-Use | Aug 16, 2016
Goettsch Partners completes mixed-use tower in R&F Yingkai Square
The 66-story building is now the 7th tallest completed building in Guangzhou.
| Aug 15, 2016
SPORTS FACILITY GIANTS: New and renovated college sports venues - designed to serve students and the community
Schools are renovating existing structures or building new sports facilities that can serve the student body and surrounding community.