How A Student's Question Saved This NYC Skyscraper

A video on YouTube. In Science & Engineering, a Krater category.

Summary by Krater

Structual engineer Bill LeMessurier discovers that his skyscraper, the Citicorp Center in New York City, has a fatal flaw under quartering winds and must covertly coordinate repairs before hurricane season.

From the video

Answers: How was the structural flaw in Citicorp Center discovered and fixed?

structural engineering
skyscraper design
chevron bracing
tuned mass damper
wind loads
building safety
Citicorp Center crisis

What it concludes

Citicorp Center had a 100 percent probability of total collapse under high quartering winds by the end of the century.
Substituting welded connections with bolted connections during construction significantly weakened the tower against diagonal wind loads.
A tuned mass damper reduced sway amplitudes and saved the building millions of dollars in structural steel.
Emergency welded repairs implemented by LeMessurier and Citicorp successfully safeguarded the skyscraper against severe hurricane threats.

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