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
| Jan 15, 2012
Smith Consulting Architects designs Flower Hill Promenade expansion in Del Mar, Calif.
The $22 million expansion includes a 75,000-square-foot, two-story retail/office building and a 397-car parking structure, along with parking and circulation improvements and new landscaping throughout.
| Jan 15, 2012
535 Madison Avenue achieves LEED Gold certification
Class-A commercial building meets sustainability requirements of LEED Program.
| Jan 12, 2012
CSHQA receives AIA Northwest & Pacific Region Merit Award for Idaho State Capitol restoration
After a century of service, use, and countless modifications which eroded the historical character of the building and grounds, the restoration brought the 200,000-sf building back to its former grandeur by restoring historical elements, preserving existing materials, and rehabilitating spaces for contemporary uses.
| Jan 12, 2012
Stellar earns construction industry's most prestigious safety award
Now widely accepted as the construction industry's standard measure of safety performance, the STEP awards were established in 1989 to evaluate and improve safety practices and recognize outstanding safety efforts.
| Jan 12, 2012
Building independence: New take on female power
Memoir explores historic engineering project, women's empowerment era.
| Jan 12, 2012
3M takes part in Better Buildings Challenge
As a partner in the challenge, 3M has committed to reduce energy use by 25% in 78 of its plants, encompassing nearly 38 million-sf of building space.
| Jan 11, 2012
DOE announces guide for 50% more energy efficient retail buildings
The 50% AEDG series provides a practical approach for designers and builders of retail stores, and other major commercial building types, to achieve 50% energy savings compared to the building energy code used in many parts of the nation.
| Jan 11, 2012
Mortenson starts construction of Rim Rock Wind Project
Renewable energy contractor to build 189-megawatt wind project in Sunburst, Mont.
| Jan 9, 2012
FGM Architects acquires SRBL Architects
The firm reviewed gaps in each of the markets and identified a need in the municipal market for stronger police facility design expertise as well as additional project management and design expertise for this market.
| Jan 9, 2012
Shawmut appoints Les Hiscoe COO and EVP
In his new role, Hiscoe will focus on developing the Company’s field services divisions; national business in retail, hospitality, gaming, and sports venues; Tri-State business in academic and healthcare; sales and marketing; and human resources