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
Education Facilities | Jul 26, 2022
Malibu High School gets a new building that balances environment with education
In Malibu, Calif., a city known for beaches, surf, and sun, HMC Architects wanted to give Malibu High School a new building that harmonizes environment and education.
| Jul 26, 2022
Better design with a “brain break”
During the design process, there aren’t necessarily opportunities to implement “brain breaks,” brief moments to take a purposeful pause from the task at hand and refocus before returning to work.
Building Team | Jul 25, 2022
First Ismaili Center in the U.S. combines Islamic design with Texas influences
Construction has begun on the first Ismaili Center in the U.S. in Houston.
Codes and Standards | Jul 22, 2022
Office developers aim for zero carbon without offsets
As companies reassess their office needs in the wake of the pandemic, a new arms race to deliver net zero carbon space without the need for offsets is taking place in London, according to a recent Bloomberg report.
Codes and Standards | Jul 22, 2022
Hurricane-resistant construction may be greatly undervalued
New research led by an MIT graduate student at the school’s Concrete Sustainability Hub suggests that the value of buildings constructed to resist wind damage in hurricanes may be significantly underestimated.
School Construction | Jul 22, 2022
School integrating conventional medicine with holistic principles blends building and landscape
Design of the new Alice L. Walton School of Medicine in Bentonville, Ark., aims to blend the building and landscape, creating connections with the surrounding woodlands and the Ozark Mountains.
Market Data | Jul 21, 2022
Architecture Billings Index continues to stabilize but remains healthy
Architecture firms reported increasing demand for design services in June, according to a new report today from The American Institute of Architects (AIA).
Market Data | Jul 21, 2022
Despite deteriorating economic conditions, nonresidential construction spending projected to increase through 2023
Construction spending on buildings is projected to increase just over nine percent this year and another six percent in 2023, according to a new report from the American Institute of Architects (AIA).
Mixed-Use | Jul 21, 2022
Former Los Angeles Macy’s store converted to mixed-use commercial space
Work to convert the former Westside Pavilion Macy's department store in West Los Angeles to a mixed-use commercial campus recently completed.
Building Team | Jul 20, 2022
San Francisco overtakes Tokyo as the world’s most expensive city for construction
San Francisco has overtaken Tokyo as the world’s most expensive city for construction, according to a new report from Turner & Townsend.