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
Sponsored | | Dec 3, 2014
Modular Space Showcase: Bringing work-life balance to energy workers in the Bakken region
To meet the demands of the booming energy business, Williston needs to provide homes, recreation centers, restaurants, hotels, and other support facilities for the tidal wave of energy workers relocating to the Bakken Shale area. SPONSORED CONTENT
| Dec 3, 2014
U.S., Canada, and Mexico finalize agreement to recognize architect credentials
The agreement represents over a decade of negotiations, bringing cross-border recognition of professional credentials from concept to reality in the spirit of the North American Free Trade Agreement.
| Dec 3, 2014
35 cities added to Rockefeller Foundation's 100 Resilient Cities Challenge
Chicago, Dallas, and Pittsburgh are among the U.S. cities to join the 100 Resilient Cities Challenge, pioneered by The Rockefeller Foundation.
| Dec 2, 2014
First existing multifamily buildings to earn Energy Star certification unveiled
River City in Chicago is one of 17 existing multifamily properties to earn Energy Star certification, which became available to this sector on Sept. 16 via a scoring system for multifamily properties that Energy Star and Fannie Mae had been developing for three years.
| Dec 2, 2014
Nashville planning retail district made from 21 shipping containers
OneC1TY, a healthcare- and technology-focused community under construction on 18.7 acres near Nashville, Tenn., will include a mini retail district made from 21 shipping containers, the first time in this market containers have been repurposed for such use.
| Dec 2, 2014
Main attractions: New list tallies up the Top 10 museums completed this year
The list includes both additions to existing structures and entirely new buildings, from Frank Gehry's Foundation Louis Vuitton in Paris to Shigeru Ban's Aspen (Colo.) Art Museum.
| Dec 2, 2014
Nonresidential construction spending rebounds in October
This month's increase in nonresidential construction spending is far more consistent with the anecdotal information floating around the industry, says ABC's Chief Economist Anirban Basu.
| Dec 2, 2014
Hoffmann Architects announces promotions
The architecture and engineering firm specializing in the rehabilitation of building exteriors announces the promotion of members of its Connecticut staff.
| Dec 2, 2014
SPARK designs urban farming housing for Singapore’s elderly population
The proposal blends affordable retirement housing with urban farming by integrating vertical aquaponic farming and rooftop soil planting into multi-unit housing for seniors.
| Dec 2, 2014
Bjarke Ingels unveils cave-like plan for public square in Battersea Power Station
A Malaysian development consortium is guiding the project, which is meant to mimic the caves of Gunung Mulu National Park in Sarawak, East Malaysia.