![]() ![]() The fact that the towers withstood initial impacts also spawned one of the most common conspiracy theories surrounding 9/11: that a bomb or explosives must have been detonated somewhere within the buildings. This is why both towers withstood the initial impacts and didn’t collapse immediately.ĩ/11: the controversial story of the remains of the World Trade Center When a few columns become damaged, the load they carry is transferred to other columns. The lack of fireproofing left the steel unprotected.Īs such, the impact also structurally damaged the supporting steel columns. That said, the aircraft did dislodge fireproofing material within the towers, which was coated on the steel columns and on the steel floor trusses (underneath concrete slabs). The towers would have been more than 1,000 times the mass of the aircraft, and designed to resist steady wind loads more than 30 times the aircrafts’ weight. If you compare the mass of an aircraft with that of a skyscraper more than 400 metres tall and built from steel and concrete, it makes sense the building would not topple over. But the answer becomes clear once you consider the details.Īircraft are made from lightweight materials, such as aluminium. Some have questioned why the buildings did not “topple over” after being struck side-on by aircraft. KEISER/EPA Why did the towers collapse as they did? On 11 September 2001, two aircrafts were flown into the centre’s twin towers, causing both to collapse. RMIT University provides funding as a strategic partner of The Conversation AU.įire and rescue workers search through the rubble of the World Trade Center in New York on 13 September 2001. The view and opinion that she has in this article is her personal view and does not represent her employer's opinion. She is a member of the Society of Fire Safety, Engineers Australia. Kate Nguyen receives funding from the Australian Research Council and other government/industry-funded programs. While at NIST, Erica worked on NIST's Technical Investigation of the 2001 WTC Disaster as a team member of Project 7: Occupant Behavior, Egress, and Emergency Communications. Also, from 2002 to 2020, Erica worked as a research engineer and social scientist in the Engineering Laboratory of the National Institute of Standards and Technology. She is affiliated with the Society of Fire Protection Engineers (SFPE) as a Section Editor for their Handbook of Fire Protection Engineering (Human Behaviour Section) and as a member of the Board of Governors for the SFPE Foundation. He is affiliated with The Institute of Civil Engineers acting as a journal Associate Editor.Įrica Kuligowski currently receives funding from the National Institute of Standards and Technology's (NIST) Measurement Science and Engineering Grants Program (as a subcontractor). Senior Lecturer, ARC DECRA Fellow and Victoria Fellow, RMIT Universityĭavid Oswald has received funding from various organisations including the Association of Researchers in Construction Management and the Australian Housing and Urban Research Institute. Vice-Chancellor's Senior Research Fellow, RMIT University Senior Lecturer in Construction, RMIT University ![]()
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