"The 59-floor 915-foot Citigroup Center, located at 53rd St and 3rd Avenue in midtown Manhattan, was one of the first skyscrapers in the world to incorporate a Tuned Mass Damper to combat the wind’s effect on a building. Constructed upon four columns located at the center rather than the corners, it is a unique architectural and engineering accomplishment, while the repair of a potentially disastrous flaw, after its construction, is recounted today as a positive lesson in professional ethics. The structural engineer, William LeMessurier, was alerted to the possibility that the building was structurally unsound by a Princeton University student in 1978. LeMessurier found the building’s bolted joints were too weak to sustain a prolonged 70mph wind, something that occurs in New York City, on average, every 16 years. Once discovered, workers welded the internal joints at night while the Red Cross implemented an evacuation plan for the surrounding neighborhood."
model by google
created at the school of the art institute of chicago, 2013
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