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
Steel Buildings | Apr 6, 2023
2023 AISC Forge Prize winner envisions the gas station of the future
Forge Prize winner LVL (Level) Studio envisions a place where motorists can relax, work, play, shop, or perhaps even get healthcare while their vehicles charge.
Architects | Apr 6, 2023
New tool from Perkins&Will will make public health data more accessible to designers and architects
Called PRECEDE, the dashboard is an open-source tool developed by Perkins&Will that draws on federal data to identify and assess community health priorities within the U.S. by location. The firm was recently awarded a $30,000 ASID Foundation Grant to enhance the tool.
Architects | Apr 6, 2023
Design for belonging: An introduction to inclusive design
The foundation of modern, formalized inclusive design can be traced back to the Americans with Disabilities Act (ADA) in 1990. The movement has developed beyond the simple rules outlined by ADA regulations resulting in features like mothers’ rooms, prayer rooms, and inclusive restrooms.
Market Data | Apr 6, 2023
JLL’s 2023 Construction Outlook foresees growth tempered by cost increases
The easing of supply chain snags for some product categories, and the dispensing with global COVID measures, have returned the North American construction sector to a sense of normal. However, that return is proving to be complicated, with the construction industry remaining exceptionally busy at a time when labor and materials cost inflation continues to put pricing pressure on projects, leading to caution in anticipation of a possible downturn. That’s the prognosis of JLL’s just-released 2023 U.S. and Canada Construction Outlook.
Cladding and Facade Systems | Apr 5, 2023
Façade innovation: University of Stuttgart tests a ‘saturated building skin’ for lessening heat islands
HydroSKIN is a façade made with textiles that stores rainwater and uses it later to cool hot building exteriors. The façade innovation consists of an external, multilayered 3D textile that acts as a water collector and evaporator.
Market Data | Apr 4, 2023
Nonresidential construction spending up 0.4% in February 2023
National nonresidential construction spending increased 0.4% in February, according to an Associated Builders and Contractors analysis of data published by the U.S. Census Bureau. On a seasonally adjusted annualized basis, nonresidential spending totaled $982.2 billion for the month, up 16.8% from the previous year.
Sustainability | Apr 4, 2023
ASHRAE releases Building Performance Standards Guide
Building Performance Standards (BPS): A Technical Resource Guide was created to provide a technical basis for policymakers, building owners, practitioners and other stakeholders interested in developing and implementing a BPS policy. The publication is the first in a series of seven guidebooks by ASHRAE on building decarbonization.
Sustainability | Apr 4, 2023
NIBS report: Decarbonizing the U.S. building sector will require massive, coordinated effort
Decarbonizing the building sector will require a massive, strategic, and coordinated effort by the public and private sectors, according to a report by the National Institute of Building Sciences (NIBS).
Education Facilities | Apr 3, 2023
Oklahoma’s Francis Tuttle Technology Center opens academic center for affordable education and training
Oklahoma’s Francis Tuttle Technology Center, which provides career-specific training to adults and high school students, has completed its Francis Tuttle Danforth Campus—a two-story, 155,000-sf academic building. The project aims to fill the growing community’s rising demand for affordable education and training.
Sports and Recreational Facilities | Mar 30, 2023
New University of St. Thomas sports arena will support school's move to Division I athletics
The University of St. Thomas in Saint Paul, Minn., last year became the first Division III institution in the modern NCAA to transition directly to Division I. Plans for a new multipurpose sports arena on campus will support that move.
