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For example, one tower shows the upper section separating from the lower section, right?
It is your claim, among others, that the upper section fell almost directly straight down, through the lower section, is it not?
With one small block as the upper section, and a second, much longer object, with the same outer dimensions, placed directly below the small block.
You are trying to claim a smaller object will be able to drive through a larger object below it.
Your claim is defying every law of physics. Do you even realize how ridiculous that is? Obviously not.
It's like a child trying to cram a square block into a round hole. It doesn't work. You are trying to cram a small block right through a massive block, and that doesn't work either.
Failure of Welded Floor Truss Connections from the Exterior Wall during Collapse of the World Trade Center Towers
Failure of connections, as a result of overloading, occurred
app.aws.org...
Analysis of the connections supporting the composite floor system of the WTC towers showed that at and below the im- pact floors, the greater majority (above 90%) of the floor truss connections were either bent downward or completely re- moved from the exterior column. This was probably related to the overloading of the floors below the impact region after col- lapse initiation. Depending upon weld joint geometry, detachment of the main load-bearing seats was a result of either fracture in the heat affected zone of the base material (standoff plate detached from spandrel) or through the weld metal (seat angle detached from standoff plate). Failure in both cases was assumed to be a result of a shear mechanism as a result of overloading from floors above impacting those below. There did not appear to be a significant change in distribution of failure modes of the floor truss connections when comparing those connections inside vs. outside of the impact region or those ex- posed to pre-collapse fires and those that were not.
originally posted by: Salander
Thermal stress? Is that like sufficient heat to boil iron for 3 months?
www.dailymail.co.uk...
originally posted by: neutronflux
Gravity pulls straight down. The top of each tower starts to lean once the buckling initiated. But once the buckled columns could not support the upper portion of the building, gravity pulled the leaning mass straight down.
Meaningless. False argument by you. The towers were not “solid blocks”. The falling masses fell into the buildings breaking floor connections. The vertical columns toppled from loss of lateral support.
When the falling mass is sufficient to overload and shear floor connections.
You deny physics if you don’t understand floor connections have a static and dynamic load ratings. Ratings that are not infinite. Ratings for the design load for a specific floor loading, and are not designed to support a whole building. Again, the vertical columns only toppled after the complete collapse of the floor system from loss of lateral support. The twin towers did not collapse through the path of greatest resistance.
Your arguing a false mythology created by the truth movement, and ignoring the actual physical and video evidence.
originally posted by: neutronflux
Gravity pulls straight down. The top of each tower starts to lean once the buckling initiated. But once the buckled columns could not support the upper portion of the building, gravity pulled the leaning mass straight down.
The twin towers did not collapse through the path of greatest resistance.
originally posted by: neutronflux
a reply to: turbonium1
False argument by. I said the mass of falling floors fell straight down. The columns that remained in the wake of the falling mass tumbled outward as in video.
So. Keep posting blatant falsehoods. Keep ignoring the actual collapse video. Keep ignoring the stages of the twin towers collapse.
Fire does not cause this.
Pictures I screenshotted from a video. They are all taken at the dumpsite Oct 2001
Holes in the steel
Fractures and tears of the steel.
Chemical reaction on the surface of the steel. Did anyone at the site take samples of this?
Steel lifted off it's welding
A hole in the steel. Missing part or result of a blast?
Smoking gun evidence- fire causing this unlikely. Three photographs from long piece.
Another angle cut piece. Three photographs same columns. Fractures and tears. Amazingly the bolts are still there.
www.metabunk.org/debunked-the-wtc-9-11-angle-cut-column-not-thermite-cut-later.t9469/
www.metabunk.org...
- fireproofing still there though NIST claims it got removed.
www.metabunk.org/the-pre-collapse-inward-bowing-of-wtc2.t4760/
www.metabunk.org...
9/11 and the Science
of Controlled Demolitions
www.skeptic.com...
3WHAT ABOUT THE ALMOST FREE-FALL COLLAPSE OF THE TWIN TOWERS? The key is the “almost” modifier. If I told you I was making almost $100,000 and you found out I was making only $67,000, you’d say I was exaggerating. So stop exaggerating the collapse speed of the WTC Towers! The 80,000 tons of structural steel slowed down the collapses of the Twin Towers to about ⅔ (two-thirds) of free-fall.3 And the core collapsed at about 40% of free-fall speed, coming down last.4 According to Richard Gage: “To bring a building symmetrically down, what we have to do is remove the core columns.” But on 9/11 the stronger core columns came down last, which violates this supposed most fundamental rule of controlled demolition.