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
3D Printing | Dec 7, 2018
Additive manufacturing heads to the jobsite
Prototype mobile 3D printing shop aims to identify additive manufacturing applications for construction jobsites.
Architects | Dec 6, 2018
Payette honored with 2019 AIA Architecture Firm Award
The award recognizes a firm that has consistently produced distinguished architecture for at least 10 years.
Biophilic Design | Nov 19, 2018
Biophilic design: What is it? Why it matters? And how do we use it?
As we continue to move toward the city and spend more time indoors, our day-to-day interaction with quality nature is shrinking. One contemporary concept to reverse this effect is biophilic design, a strategic approach to tap into—and harness—nature in the built environment.
Architects | Nov 6, 2018
Kohn Pedersen Fox opens three new offices
Following exciting current work, new commissions, and upcoming opportunities, global architecture firm embraces the future with new outposts.
Architects | Oct 2, 2018
Gensler, in latest report, highlights where resilient design could make the greatest impact on the built environment
The firm showcases its own recent projects as demonstrations for what can work in six areas.
Architects | Sep 24, 2018
Assembly (and rigorous planning) required: Managing the pros and cons of modular construction
While offering efficiency and flexibility, modular construction requires extensive planning and collaboration to avoid potential challenges.
Architects | Sep 19, 2018
Back it up: Parking lot trends
There are two shifts that we are seeing in parking lot planning and design – and these shifts are rooted in parking’s place at the intersection of environment, transportation, and market behavior.
Architects | Sep 14, 2018
We’ve entered the golden age of brain science. What does it mean for AEC firms?
New research from the SMPS Foundation explores the known principles and most recent research surrounding the human brain and behavioral science. The goal: to discover connections between the science and the AEC business.
Architects | Sep 6, 2018
S/L/A/M Collaborative completes merger with L.A.-based firm
The healthcare sector is one of Frank Webb Architects’ strengths.
Giants 400 | Sep 6, 2018
What's happening at 89 design firms
The latest developments at 89 of the nation's largest architecture and architecture/engineering (AE) firms.