World trade center twin towers construction

It opened on April 4,and was destroyed during the September 11 attacks in The complex contained 13, square feet 1, m 2 of office space and, prior to its completion, was projected to accommodate an estimatedpeople.

Kennedy announced the U. Building the new towers would marshal unprecedented levels of design innovation, engineering prowess — and breathtaking risk. Born into a poor family of Japanese immigrants in Seattle, Washington, Minoru Yamasaki put himself through college working in fish canneries in Alaska. He started his career in New York, working for the firm that built the Empire State Building, and rose to helm his own firm in Detroit. The Port Authority chose Yamasaki based on his proposal to design a vast trade center that still had the intimate, human-focused qualities of his other designs. Perhaps motivated by self-interest as well as concern, a group of leading New York City real estate developers unsuccessfully challenged the Port Authority to scale down its proposal for the World Trade Center beginning in

World trade center twin towers construction

The World Trade Center was originally planned to be built on the east side of Lower Manhattan, but the New Jersey and New York state governments, which oversee the Port Authority, could not agree on this location. The Port Authority hired architect Minoru Yamasaki , who came up with the specific idea for twin towers. The towers were designed as framed tube structures , which provided tenants with open floor plans, uninterrupted by columns or walls. This was accomplished using numerous closely spaced perimeter columns to provide much of the strength to the structure, along with gravity load shared with the core columns. The elevator system, which made use of sky lobbies and a system of express and local elevators, allowed substantial floor space to be freed up for use as office space by making the structural core smaller. The design and construction of the World Trade Center, most centrally its twin towers, involved many other innovative techniques, such as the slurry wall for digging the foundation , and wind tunnel experiments. Extensive use of prefabricated components helped to speed up the construction process. Four other low-level buildings were constructed as part of the World Trade Center in the early s, and the complex was mostly complete by A seventh building, 7 World Trade Center , was opened in In , Austin J. Tobin became the Executive Director of the Port Authority , beginning a year career during which he oversaw the planning and development of the World Trade Center.

Archived from the original on May 17, Fanella, David A. Main article: The Bathtub.

.

Completed in , the towers stood at stories each, accommodating 50, workers and , daily visitors in 10 million square feet of space. On September 11, , the World Trade Center became the target of a massive terrorist attack that took the lives of nearly 3, people. The disaster also radically altered the skyline of New York City, destroying the twin columns of glass and steel that over the years had come to embody the city itself. Aldrich, headed a new state agency with the proposed goal of creating a permanent trade exposition based in New York. Market research indicated that the city would benefit more by modernizing its ports, however, and the plan was soon scrapped. Did you know? More than 10, workers were involved in building the World Trade Center complex. The grandson of Standard Oil founder John D. Rockefeller , David decided to revive the World Trade Center concept as the core of a revitalized lower Manhattan. For the resources and power to make the project work, Rockefeller turned to the Port of New York Authority.

World trade center twin towers construction

Long before the World Trade Center became synonymous with the most damaging terrorist attack in U. Upon its completion in , the two towers that rose from the acre But the construction of such mammoth structures had its challenges. The first major challenge was the building site itself. The location selected for the project, on Manhattan's Lower West Side, had been built upon generations of landfill that had actually grown and compacted on itself so much that it had extended the Lower West Side of Manhattan into the Hudson River. To reach a solid base of bedrock, workers had to dig down 70 feet But because of the proximity of the river, a barrier needed to be created that would keep the excavated section of the city from filling with water as fast as the earth was removed. The answer was something that became known as the slurry trench method. A trench dug deep in the ground was filled with a slurry mixture made from water and an expanding clay known as bentonite. This slurry was denser than the surrounding dirt, so it kept the ditch from caving in.

X 2 y 2 2xy

Retrieved February 23, The tower on the left, with antenna spire, was 1 WTC. Why not one story building? S2CID Peacock; Erica D. November 12, Archived from the original on October 12, NIST lists upgraded floors as 92— and plus 8 unspecified floors. Under the state law, the Port Authority was required to assist business owners in relocating, something it had been doing since The terrorist organization al-Qaeda , led by Osama bin Laden , carried out the attacks in retaliation for certain aspects of American foreign policy, particularly U. Archived from the original on May 21, All elevators were located in the core. On August 3 , , an agreement was reached whereby the Port Authority would make annual payments to the City in lieu of taxes for the portion of the World Trade Center leased to private tenants.

The World Trade Center was originally planned to be built on the east side of Lower Manhattan, but the New Jersey and New York state governments, which oversee the Port Authority, could not agree on this location.

The Washington Post. Retrieved August 20, The slurry method was devised by Port Authority chief engineer John M. Tallest in the world from to [I]. Toggle limited content width. Lew; Richard W. April 5, Building the foundation of the twin towers required digging 70 feet to the bedrock and excavating more than 1 million cubic yards of dirt. Retrieved August 24, Sixteen acres : architecture and the outrageous struggle for the future of Ground Zero. November 4, Retrieved June 11,