World trade center(History & Collapse)
The Structural System:
Minoru Yamasaki and engineers John Skilling and Les Robertson worked closely and the relationship between the towers design and structure is clear. Faced with the difficulties of building to unprecedented heights, the engineers employed an innovative structural model: a rigid hollow tube of closely spaced steel columns with floor trusses extending across to a central core. The columns, finished with a silver-colored aluminum alloy, were 3/4" wide and set only 22" apart, making the towers appear from the distance to have no windows at all.
Each tower had 110 floors and each floor had 50,000 square feet. The approximate weight of a tower was a stunning 500.000 tons. The World Trade Center contained 198 miles of heating ducts and 97 elevators for passengers. It was composed of: 200,000 tons of steel, 425,000 cubic yards of concrete, 43,600 windows, 12,000 miles of electric cables
and it even had its own zip code: 10048.
The Creator's Words
"I feel this way about it. World trade means world peace and consequently the World Trade Center buildings in New York ... had a bigger purpose than just to provide room for tenants. The World Trade Center is a living symbol of man's dedication to world peace ... beyond the compelling need to make this a monument to world peace, the World Trade Center should, because of its importance, become a representation of man's belief in humanity, his need for individual dignity, his beliefs in the cooperation of men, and through cooperation, his ability to find greatness."
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