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https://www.thoughtco.com/rebuilding-after-terror-178540
Nov 12, 2019 · The last support beam from the south tower of the former World Trade Center was removed during a ceremony on May 30, 2002. This marked the official end of the World Trade Center recovery operation. The next step was to rebuild a subway tunnel that would extend 70 feet below ground at Ground Zero.
https://science.howstuffworks.com/engineering/structural/wtc1.htm
The World Trade Center towers had an innovative "tube" design, with a perimeter support structure joined to a central core structure with horizontal floor trusses. The final design for the WTC was a group effort, bringing together the work of dozens of architects, structural engineers and managers, led by a few prominent talents.
https://www.youtube.com/watch?v=NKh08cAMfSU
Sep 09, 2015 · We’re grateful to have played a part in the transport of this World Trade Center beam, which will be the centerpiece of a permanent memorial located at the Kennedy Space Center Fire Rescue 9/11 ...Author: American Airlines
https://news.stanford.edu/pr/01/wtcpostmortem125.html
NEWS RELEASE. 12/3/01 . Mark Shwartz, News Service (650) 723-9296; e-mail: [email protected] . Structural engineer describes what went wrong inside the World Trade Center on …
http://ine.uaf.edu/media/92216/wtc7-structural-reevaluation_progress-report_2017-9-7.pdf
1. World Trade Center Building 7 (WTC 7) was not struck by a plane and yet it collapsed. Why? 2. The National Institute for Standards and Technology (NIST) issued a report in 2008 concluding that the structure collapsed because fires caused the floor beams and girders to expand, triggering a series of structural failures that
https://science.howstuffworks.com/engineering/structural/grade-of-steel-used-in-world-trade-center.htm
In the external walls of towers one and two of the World Trade Center, the steel also varied by thickness to allow for different pressure loads at different levels. In the lower levels, the thickness was most frequently around 4 inches (10 centimeters), while at higher floors, it could be as thin as 0.25 inch (0.64 centimeter) [source: FEMA].
https://www.popularmechanics.com/military/a6384/debunking-911-myths-world-trade-center/
Sep 10, 2019 · The collapse of both World Trade Center towers—and the smaller WTC 7 a few hours later—initially surprised even some experts. But subsequent studies have shown that …Author: Popular Mechanics Editors
https://en.wikipedia.org/wiki/Construction_of_the_World_Trade_Center
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. Construction of the World Trade Center's North Tower began in August 1968, and the South Tower in 1969.
https://en.wikipedia.org/wiki/Tribute_in_Light
The Tribute in Light is an art installation of 88 searchlights placed six blocks south of the World Trade Center on top of the Battery Parking Garage in New York City to create two vertical columns of light to represent the Twin Towers in remembrance of the September 11 attacks.
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