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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.
http://911research.wtc7.net/wtc/arch/perimeter.html
The towers' perimeter walls comprised dense grids of vertical steel columns and horizontal spandrel plates. These, along with the core structures, supported the towers. In addition to supporting gravity loads, the perimeter walls stiffened the Towers against lateral loads, particularly those due to winds.
https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910105
WTC 7 were the foundation, exterior moment frames, floor system, interior columns, and column transfer trusses and girders. At the time of design and construction, the World Trade Center (WTC) towers were innovative in many ways, and resulted in a tremendous increase of open-plan commercial office space in downtown Manhattan.
http://www.metacafe.com/watch/448820/world_trade_center_support_columns_cut_with_shaped_charges_viv/
This short clip shows the core box columns from the WTC buildings that had perfectly cut angles & molten residue along the edges of these sharp cuts. Further evidence of …
https://news.stanford.edu/pr/01/wtcpostmortem125.html
According to Hamburger's preliminary analysis, the impact of the jetliners shattered and fractured two-thirds of the support columns on one face of each tower, causing the partial collapse of ...
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