Trabajo torres gemelas 2

The World Trade Center is a site for various buildings in Lower Manhattan, New York City, United States. The original World Trade Center was a complex of seven buildings. It featured landmark twin towers, which opened on April 4, 1973 and were destroyed in the September 11 attacks of 2001. The other buildings in the complex were damaged in the attacks and eventually destroyed.

The complex was designed in the early 1960s by Minoru Yamasaki and Associates of Troy, Michigan, and Emery Roth and Sons of New YorkThe North Tower was completed in December 1972 and the South Tower was finished in July 1973.

Architectural design

On September 20, 1962, the Port Authority announced the selection of Minoru Yamasaki as lead architect and Emery Roth & Sons as associate architects.

Yamasaki devised the plan to incorporate twin towers; Yamasaki's original plan called for the towers to be 80 stories tall. 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

Yamasaki's design for the World Trade Center, unveiled to the public on January 18, 1964, called for a square plan approximately 208 feet (63 m) in dimension on each side

Construction

In March 1965, the Port Authority began acquiring property at the World Trade Center site. Demolition work began on March 21, 1966, to clear thirteen square blocks of low rise buildings in Radio Row for construction of the World Trade Center. Groundbreaking for the construction of the World Trade Center took place on August 5, 1966.

In January 1967, the Port Authority awarded $74 million in contracts to various steel suppliers, and Karl Koch was hired to erect the steel. Tishman Realty & Construction was hired in February 1967 to oversee construction of the project. Construction work began on the North Tower inAugust 1968; construction on the South Tower was underway by January 1969. The original Hudson Tubes, carrying PATH trains into Hudson Terminal,

remained in service as elevated tunnels during the construction process until 1971 when a new PATH station opened.The topping out ceremony of 1 WTC (North Tower) took place on December 23, 1970, while 2 WTC's ceremony (South Tower) occurred later on July 19, 1971.The first tenants moved into the North Tower in December 1970; the South Tower accepted tenants in January 1972. When the World Trade Center twin towers were completed, the total costs to the Port Authority had reached $900 million. The ribbon cutting ceremony was on April 4, 1973

SEPTEMBER 11, 2001

NEW YORK CITY

On the morning of september 11, 2001, terrorists from AL QUAEDA

Kidnapped two Boings 767, one from America Airlans and other from United Airlines

To crash them into both towers of the World Trade Center in a suicide attack

The first plane hit the north tower and the second one hit the south towers

The firs tower to collapse was the south tower. 2.606 people died in the attack becouse they were unable to leave buidling. This attack is the worst terrorist action in American soil.

To remember the victims of the attack the American Built a Memorial. This place is now known as ground ZERO and it is a tourist attractions.

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