NEVER FORGET: JET FUEL MELT STEEL BEAMS BUT NOT PASSPORT PAPER
(media.greatawakening.win)
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That was the day I woke up. I was in welding class at city college cutting some steel with an oxy-acetylene torch.
I just so happened to be cutting a piece of 2-inch thick steel I-beam at the time the two planes hit the twin towers.
The government tried telling me that steel can be cut with jet fuel.
Steel will fail when the temperature gets high enough, and jet fuel burns hot enough that you cannot use steel in turbine engines because it would melt, even though the internal parts are air-cooled. You don't need to "cut" when the columns will fail in shear along diagonal lines. And you can't call the government out for lies when you don't even know the subject matter.
Doesnt explain the ENTIRE building collapsing in its own footprint even if its true that it burned hot enough to weaken in certain areas.
Many lesser built steel bldg have faced worse without collasping https://911research.wtc7.net/wtc/analysis/compare/fires.html
Catastrophic collapse means that the vertical load bearing capability has gone to less than the burdened weight (all the structural margin has been used up by the fire-weakening of the columns). The way this happens is that first one column fails. The compressive load is then redistributed among the remaining columns at the speed of sound in the hot steel (probably close to 4000 feet/second). With one column gone, the load per column just got greater, and another column will fail. This is a chain reaction that will take only milliseconds to spread across all the columns, during which time the overburden would scarcely have moved. The underlying floor will have failed, the overburden falls at gravity acceleration, lands on the next floor, and the process starts all over again. Since the upper stories are massive, there is plenty of inertia to prevent it from tipping in the time it takes for the downward collapse.
I doubt other buildings have had occasion to collapse in just this way, which is the result of the structural core being rendered useless by heat-weakening from a tremendous fire.
NAH,that is just NIST coverup nonsense
These people who risked their reputations and livilihoods to tell the truth are FAR more credible to me.
https://www.ae911truth.org/evidence/technical-articles/articles-by-ae911truth/debunking-the-real-9-11-myths/489-debunking-the-real-9-11-myths-part3
https://ine.uaf.edu/wtc7