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
Architects | Dec 9, 2019
Jonathan Moody promoted to CEO of Moody Nolan
New four-member Executive Team also named.
Big Data | Dec 4, 2019
AEC data's coming out party
AEC firms are finally putting to use project information they’ve been storing in their computers for years.
Building Owners | Dec 2, 2019
What building owners and AEC teams need to know about New York’s Climate Mobilization Act
On April 18, 2019, the New York City Council passed the Climate Mobilization Act, a suite of laws aimed to meet the city’s commitment to achieving carbon neutrality by 2050.
| Nov 26, 2019
Steinberg Hart and Holzman Moss Bottino Architecture combine to elevate design, expand opportunities and strengthen client relationships
This union creates a national architecture firm with enhanced design capabilities and expertise.
| Nov 8, 2019
Philadelphia architecture firm EwingCole acquires Baltimore firm Gaudreau
Philadelphia architecture firm EwingCole acquires Baltimore firm Gaudreau.
Multifamily Housing | Nov 7, 2019
Multifamily construction market remains strong heading into 2020
Fewer than one in 10 AEC firms doing multifamily work reported a decrease in proposal activity in Q3 2019, according to a PSMJ report.
Architects | Oct 29, 2019
Top takeaways from the Lean Construction Institute Congress 2019
More than 1,600 Lean experts gathered in Texas this month for LCI Congress 2019. Here are key takeaways from the event.
Giants 400 | Oct 25, 2019
Top 50 Airport Sector Architecture Firms for 2019
AECOM, Gensler, HNTB, Corgan, and HOK top the rankings of the nation's largest airport terminal sector architecture and architecture engineering (AE) firms, as reported in Building Design+Construction's 2019 Giants 300 Report.
Giants 400 | Oct 24, 2019
Top 125 Retail Architecture Firms for 2019
CallisonRTKL, Gensler, MG2, NELSON, and Stantec top the rankings of the nation's largest retail sector architecture and architecture engineering (AE) firms, as reported in Building Design+Construction's 2019 Giants 300 Report.
Architects | Oct 11, 2019
SMPS report tracks how AEC firms are utilizing marketing technology tools
With thousands of MarTech tools and apps on the market, design and construction firms are struggling to keep up.