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
BIM and Information Technology | Jun 21, 2015
11 tips for mastering 3D printing in the AEC world
Early adopters provide first-hand advice on the trials and tribulations of marrying 3D printing with the science of building technology.
Events Facilities | Jun 19, 2015
4 ways convention centers are revamping for the 21st century
Today's convention centers require more flexible spaces, the ability to blend virtual and in-person events, and meaningful sustainability, writes Skanska's Tom Tingle.
Engineers | Jun 18, 2015
Architecture and engineering profit margins deliver third consecutive year of growth
Operating profits of AE firms have reach their highest level since 2009, according to a new report by PSMJ Resources.
Architects | Jun 17, 2015
Starchitects' napkin sketches raise thousands for San Diego’s AIAS chapter
Prominent architects who submitted a total of 23 napkin doodles were Zaha Hadid, Cesar Pelli, Robert Venturi, Massimiliano Fuksas, Thom Mayne, and Bjarke Ingels.
BIM and Information Technology | Jun 16, 2015
What’s next for 3D printing in design and construction?
The 3D printer industry keeps making strides in technology and affordability. Machines can now print with all sorts of powderized materials, from concrete to chocolate.
Office Buildings | Jun 12, 2015
Houston's energy sector keeps office construction humming
Colliers International projects continued expansion this year in its quarterly report on national office market.
Smart Buildings | Jun 11, 2015
Google launches company to improve city living
The search engine giant is yet again diversifying its products. Google has co-created a startup, called Sidewalk Labs, that will focus on “developing innovative technologies to improve cities.”
Office Buildings | Jun 11, 2015
Pop-up tree-office opens in London borough of Hackney
London's Hackney borough welcomed a new kind of workspace to Hoxton Square—the TreexOffice.
Cultural Facilities | Jun 10, 2015
Artists turn oil tankers into architecture
Four Dutch artists propose transforming tankers into monuments with mixed-use space.
Office Buildings | Jun 9, 2015
Bjarke Ingels unveils stepped design for final WTC tower
The towering "staircase" will rise from St. Paul’s chapel to the skyline, leaning against One World Trade Center.
