Learn about the unique construction of the City Corp Tower and the challenges faced. Discover the potential flaw in the building's structure and the secret construction project that took place. Hear about Diane Hartley's research on the building's design, and reflections on problem-solving and gratitude.
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Quick takeaways
The City Corp Center's unique design featured stilts that supported the building, but this innovative design posed a hidden danger related to cornering winds.
A potential disaster was concealed for many years due to the building's vulnerability to quartering winds, which was discovered by a college senior but not fully addressed at the time.
Deep dives
City Corp Center's Unusual Design
The City Corp Center, a skyscraper in New York, has a unique and visually stunning design. The building appears to be floating mid-air, supported by stilts that are not located in the corners as one would expect. The architect, Hugh Stubbins, and the Chief Structural Engineer, William LeMejor, worked together to create a lightweight structure using a chevron bracing system. The building's stability is ensured by a 400-ton tuned mass damper on the rooftop. However, this innovative design posed a hidden danger related to cornering winds.
Recognizing the Vulnerability to Cornering Winds
A college senior, Diane Hartley, studying architecture and urban planning at Princeton University, discovered a potential problem with the City Corp Center's design. She raised concerns about the building's vulnerability to quartering winds, which exert pressure on the corners of the structure. Initially unsure if she had made an error, Diane reached out to the engineering firm involved in the building's design. However, her findings were not fully addressed or investigated at the time, leading to a potential disaster that remained concealed for many years.
Emergency Repairs and Secrecy
Nearly 20 years after the building was constructed, writer Joe Morgenstern overheard the story of the City Corp Center at a party and broke the story in the New Yorker. The information revealed a sequence of minor design flaws that, when combined, could have resulted in the catastrophic failure of the building. Structural engineer William LeMejor, upon discovering the potential danger, collaborated with City Corp chairman Walter Riston to coordinate emergency repairs. These repairs were executed covertly over three months, without informing the building's tenants. Their efforts successfully saved the building and ensured the safety of the surrounding area.
99% Invisible is honored to accept a 2015 Third Coast International Audio Festival award for Structural Integrity, a story of architectural engineering gone wrong, and then covertly made right. When it was built in 1977, the 59-story CitiCorp Center had … Continue reading →
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