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
Digital Twin | Aug 27, 2020
The Weekly show: Digital twin technology and social equity in the AEC market
The August 27 episode of BD+C's "The Weekly" is available for viewing on demand.
Architects | Aug 26, 2020
We the People: Four steps for the architecture profession to build unity through design
Architect offers a 4-point manifesto to the design community to work for racial and social justice in the U.S. following the death of George Floyd.
Coronavirus | Aug 25, 2020
Video: 5 building sectors to watch amid COVID-19
RCLCO's Brad Hunter reveals the winners and non-winners of the U.S. real estate market during the coronavirus pandemic.
Architects | Aug 19, 2020
Japan’s Tokyo Toilet project looks to improve the perception of public restrooms
17 toilets throughout Shibuya will be redesigned as part of the project.
Architects | Aug 5, 2020
Final report: BD+C's 2020 Color Trends Report
This special research report from the editors of BD+C explores the leading trends and drivers related to the use of color on commercial, institutional, and multifamily building projects.
University Buildings | Aug 2, 2020
R&D hubs, modular-built hotels, and an award-winning student center on the August 6 “The Weekly”
R&D hubs, modular-built hotels, and an award-winning student center on the August 6 “The Weekly”
University Buildings | Jul 24, 2020
A hybrid learning approach could redefine higher education
Universities reassess current assets to determine growth strategies.
Coronavirus | Jun 19, 2020
Experts address COVID-19's impact on nursing homes and schools on The Weekly
The June 18 episode of BD+C's "The Weekly" is available for viewing on demand.
Coronavirus | Jun 12, 2020
BD+C launches 'The Weekly,' a streaming program for the design and construction industry
The first episode, now available on demand, features experts from Robins & Morton, Gensler, and FMI on the current state of the AEC market.
Architects | Jun 8, 2020
Two Frank Lloyd Wright sites set to reopen for tours with enhanced health and safety protocols
The sites will reopen on Thursday, June 11.