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
| Jul 9, 2012
Integrated Design Group completes UCSB data center
Firm uses European standard of power at USCB North Hall Research Data Center.
| Jul 9, 2012
Oakdale, Calif., Heritage Oaks Senior Apartments opens
New complex highlights senior preferences for amenities.
| Jul 3, 2012
Trimble to acquire WinEstimator
Acquisition adds estimating software solutions to Meridian Systems’ portfolio.
| Jul 3, 2012
Summit Design+Build completes Emmi Solutions HQ
The new headquarters totals 20,455 sq. ft. and features a loft-style space with exposed masonry and mechanical systems, 17-ft clear ceilings, two large rooftop skylights, and private offices with full glass partition walls.
| Jul 3, 2012
TOLK now called Dewberry
The renaming indicates a simplification in Dewberry’s corporate naming conventions.
| Jul 2, 2012
Bernards building mixed-use project in Beverly Hills
The project includes 88 luxury apartment homes atop a 14,000-sf Trader Joe’s market and a new coffee shop.
| Jul 2, 2012
San Francisco lays claim to the greenest building in North America
The 13-floor building can hold around 900 people, but consumes 60% less water and 32% less energy than most buildings of its kind.
| Jul 2, 2012
Plumosa School of the Arts earns LEED Gold
Education project dedicated to teaching sustainability in the classroom.
| Jun 29, 2012
SOM writes a new chapter at Cincinnati’s The Christ Hospital
The 332,000–sf design draws on the predominantly red brick character of The Christ Hospital’s existing buildings, interpreting it in a fresh and contemporary manner that fits well within the historic Mt. Auburn neighborhood while reflecting the institution’s dedication to experience, efficiency, flexibility, innovation and brand.
| Jun 29, 2012
Benjamin Moore Paints announces new CEO
Robert S. Merritt comes to Benjamin Moore with over three decades of management experience in the restaurant and food preparation and distribution industries