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 | Sep 30, 2020
Sir David Adjaye OBE to receive 2021 Royal Gold Medal for Architecture
His practice, Adjaye Associates, was founded in 2000 and today has studios in Accra, London and New York, with projects across the world.
Coronavirus | Sep 28, 2020
Evaluating and investing resources to navigate past the COVID-19 pandemic
As AEC firm leaders consider worst-case scenarios and explore possible solutions to surmount them, they learn to become nimble, quick, and ready to pivot as circumstances demand.
Coronavirus | Sep 24, 2020
The Weekly show: Building optimization tech, the future of smart cities, and storm shelter design
The September 24 episode of BD+C's "The Weekly" is available for viewing on demand.
Healthcare Facilities | Sep 10, 2020
Easing the oncology journey: The role of urgent care
Oncology patients are better served when they’re connected to the right staff.
Airports | Sep 10, 2020
The Weekly show: Curtis Fentress, FAIA, on airport design, and how P3s are keeping university projects alive
The September 10 episode of BD+C's "The Weekly" is available for viewing on demand.
Architects | Sep 8, 2020
The New City project by Eric Owen Moss Architects receives AIA’s Twenty-five Year Award
AIA’s Twenty-five Year Award is conferred on a building that has set a precedent for the last 25-35 years and continues to set standards of excellence for its architectural design and significance.
Architects | Sep 1, 2020
An evidenced-based approach to elevate the workplace experience
A new NBBJ report presents design concepts for providing people with opportunities to recharge and engage in the workplace.
K-12 Schools | Sep 1, 2020
The rise of inquiry-based learning in K-12 communities
Inquiry-based education offers a methodology that does not rely solely on the educator being the lead in all learning.
Giants 400 | Aug 28, 2020
2020 Giants 400 Report: Ranking the nation's largest architecture, engineering, and construction firms
The 2020 Giants 400 Report features more than 130 rankings across 25 building sectors and specialty categories.
Architects | Aug 27, 2020
Strategically planning your firm past the COVID-19 pandemic
As AEC firm leaders consider worst-case scenarios and explore possible solutions to surmount them, they learn to become nimble, quick, and ready to pivot as circumstances demand.