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CaptionThe World Trade Center is a complex of buildings under construction in Lower Manhattan New York City United States replacing an earlier complex of seven buildings with the same name on the same site. The original World Trade Center featured landmark twin towers which opened on April 4 1973 and were destroyed in the September 11 attacks of 2001 along with 7 World Trade Center. The other buildings in the complex were damaged in the attacks and their ruins were eventually demolished. --- --- --- On September 20 1962 the Port Authority announced the selection of Minoru Yamasaki as lead architect and Emery Roth & Sons as associate architects.[17] Yamasaki devised the plan to incorporate twin towers; Yamasaki's original plan called for the towers to be 80 stories tall [18] but to meet the Port Authority's requirement for 10 000 000 square feet 930 000 m2 of office space the buildings would each have to be 110 stories tall.[19] A typical floor layout and elevator arrangement of the WTC towers.--- --- --- A major limiting factor in building height is the issue of elevators; the taller the building the more elevators are needed to service the building requiring more space-consuming elevator banks. Yamasaki and the engineers decided to use a new system with two "sky lobbies"—floors where people could switch from a large-capacity express elevator to a local elevator that goes to each floor in a section. This system inspired by the New York City Subway system allowed the design to stack local elevators within the same elevator shaft. Located on the 44th and 78th floors of each tower the sky lobbies enabled the elevators to be used efficiently increasing the amount of usable space on each floor from 62 to 75 percent by reducing the number of elevator shafts. Altogether the World Trade Center had 95 express and local elevators. --- --- --- On September 11 2001 Islamist terrorists hijacked American Airlines Flight 11 and crashed it into the building
HeadlineTallest in the world from 1971 to 1973. Destroyed by terrorists on September 9 2001 and now known as Ground Zero
KeywordsWorlds-tallest-structure
Copyright Noticeen.wikipedia.org/wiki/ World_Trade_Center_ Twin_Towers
Creditrememberbuilding7.org
URLhttp://en.wikipedia.org/wiki/World_Trade_Center_Twin_Towers

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9-11_Statue-of-Liberty_and-WTC-fire.JPG 25 Kb 04/19/2013 737 0.00 (0 votes)

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