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
Multifamily Housing | Jul 12, 2017
Midyear Rent Report: 26 states saw rental price increases in first half of 2017
The most notable rental increases are in growing markets in the South and Southwest: New Orleans, Glendale, Ariz., Houston, Reno, N.V., and Atlanta.
Giants 400 | Jul 12, 2017
Innovation abounds, but will it lead to growth for AEC Giants?
Engineering firms such as Arup, Glumac, and Thornton Tomasetti are leveraging their in-house expertise to develop products and tools for their design teams, clients, and even the competition.
Multifamily Housing | Jul 12, 2017
7 noteworthy multifamily projects: posh amenities, healthy living, plugged-in lifestyle
Zen meditation gardens, bocce courts, saltwater pools, and free drinks highlight the niceties at these new multifamily developments.
Accelerate Live! | Jul 6, 2017
Watch all 20 Accelerate Live! talks on demand
BD+C’s inaugural AEC innovation conference, Accelerate Live! (May 11, Chicago), featured talks on machine learning, AI, gaming in construction, maker culture, and health-generating buildings.
Healthcare Facilities | Jun 29, 2017
Uniting healthcare and community
Out of the many insights that night, everyone agreed that the healthcare industry is ripe for disruption and that communities contribute immensely to our health and wellness.
Architects | Jun 25, 2017
Stantec adds RNL Design to its stable, fortifying several of its business units
The engineering giant also names successor to CEO who will retire at the end of this year.
Building Team | Jun 22, 2017
Seven lessons learned on commissioning projects
Commissioning is where the rubber meets the road in terms of building design.
Sponsored | Building Team | Jun 20, 2017
Plan ahead when building in the west
Getting a project through plan review can be an unusually long process, anywhere from six months to two years.
Architects | Jun 19, 2017
Preparing to negotiate: Get your head in the game
Logical and well-planned steps to effective negotiation.
| Jun 13, 2017
Accelerate Live! talk: Is the road to the future the path of least resistance? Sasha Reed, Bluebeam (sponsored)
Bluebeam’s Sasha Reed discusses why AEC leaders should give their teams permission to responsibly break things and create ecosystems of people, process, and technology.