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No, they were designed to collapse in a certain way if needed, ie during controlled demolition when they were no longer needed, I'm sure I heard / read that somewhere.
points such as bad welds,
Just because you don't think it could happen, doesn't mean it didn't.
Your pride is irrelevant to the mechanism of structural collapse.
I had no idea office fires could melt steel but according to the NIST Report they can.
Answers to Frequently Asked Questions
In no instance did NIST report that steel in the WTC towers melted due to the fires. The melting point of steel is about 1,500 degrees Celsius (2,800 degrees Fahrenheit). Normal building fires and hydrocarbon (e.g., jet fuel) fires generate temperatures up to about 1,100 degrees Celsius (2,000 degrees Fahrenheit). NIST reported maximum upper layer air temperatures of about 1,000 degrees Celsius (1,800 degrees Fahrenheit) in the WTC towers (for example, see NCSTAR 1, Figure 6-36).
However, when bare steel reaches temperatures of 1,000 degrees Celsius, it softens and its strength reduces to roughly 10 percent of its room temperature value. Steel that is unprotected (e.g., if the fireproofing is dislodged) can reach the air temperature within the time period that the fires burned within the towers. Thus, yielding and buckling of the steel members (floor trusses, beams, and both core and exterior columns) with missing fireproofing were expected under the fire intensity and duration determined by NIST for the WTC towers.
UL did not certify any steel as suggested. In fact, in U.S. practice, steel is not certified at all; rather structural assemblies are tested for their fire resistance rating in accordance with a standard procedure such as ASTM E 119 (see NCSTAR 1-6B). That the steel was “certified ... to 2000 degrees Fahrenheit for six hours” is simply not true.
If anyone believes something else brought down the WTC they better be careful, or they will be labeled a "conspiracy theorist". or anti-government.
But here's a thought, if it's so easy to get buildings to fall like that? Why
do they ever need some highly trained demo crew with expertise in
That is a very good question. I have always wonder that to. Why not pour jet fuel on the top floors of any building and watch it burn for an hour and the whole building should fall down in it's own foot print, just like the Trade
World Trade Center 5 Failure Analysis
World Trade Center 5 (WTC 5) was a 9-story office and retail building at the World Trade Center complex in New York City, NY. On September 11, 2001, flaming debris from the collapse of the World Trade Center Towers penetrated the roof of WTC 5, causing a fire that burned unchecked until the fuel from building contents was consumed (FEMA, 2002, p. 4-4). While impact damage over a portion of the building and an intense fire throughout are not surprising given the assault this building received, engineers inspecting the building after the event were not expecting to see an interior collapse, due entirely to the influence of the fire. The floors collapsed between the 8th and the 4th levels in the eastern section of the building, where there was no initial impact damage (Figure 1).
Photo: WTC 5 Internal Collapse
The major fire-induced collapse that occurred in WTC 5 involved the portion of the building that had Gerber framing (girder stubs welded to columns, and simply supported central girder spans with shear connections to the ends of the stubs (Figure 2)), but not other areas of the building where girders spanned the full distance between columns. This fact, and observations at the site suggesting that the failure was early in the fire, raised the possibility that this structure had a vulnerability that led to premature failure, perhaps during the heating phase of the fire.
originally posted by: waypastvne
Just what caused all those panels to fail at the same
Still no answers from the truth movement as to why the walls pulled in before collapse.
When a large mass is moving/ falling it produces a dynamic load on imoact that is greater than the stationary load when at rest.