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Creative Speculation
In reply to the discussion: North Tower Exploding... [View all]William Seger
(11,729 posts)43. No 47-story building has ever been CD'ed, by any method
The tallest steel-framed building ever demolished with explosives was the 28-story J.L.Hudson Department Store in Detroit (and actually, only a small part of it was that tall). Watch this video and then try again to tell me how WTC7 was anything like this:
Even though this building was considerably shorter than WTC7, it was a major technical challenge:
Double column rows installed in the structure between vertical construction phases, internal brick shear walls, x-bracing, 70 elevators and 10 stairwells created an extremely stiff frame. Columns weighing over 500 lb/ft, having up to 7.25 inch thick laminated steel flanges and 6 inch thick webs, defied commercially available shaped charge technology. CDI analyzed each column, determined the actual load it carried and then used cutting torches to scarf-off steel plates in order to use smaller shaped charges to cut the remaining steel. CDI wanted to keep the charges as small as possible to reduce air over pressure that could break windows in adjacent properties.
http://www.controlled-demolition.com/jl-hudson-department-store
It's fair enough to say that it's theoretically possible to demolish a 47-story building with either explosives or thermite even though neither has ever been done (and even though there it's never been demonstrated that cutting a heavy column with thermite is actually possible). However, it's intellectually irresponsible to fail to consider what either would entail, and to simply imagine that either could be done in secret, in an occupied office building, in such a way that it would look like exactly like a progressive collapse caused by loss of structural integrity.
The NIST hypothesis was formulated through quantitative, physics-based analysis by dozens of structural mechanics experts, most of whom were from private industry. The CD hypothesis was concocted using imaginary physics by people who apparently don't know anything at all about structural mechanics. The NIST hypothesis does a credible job of explaining ALL the evidence, whereas the CD hypotheses falls completely apart if all the evidence is considered. When asked to justify and substantiaate such a ludicrously implausible hypothesis as CD, the best "truthers" can do is to say, "If it looks like a CD, then it must be a CD," while ignoring that the premise is not sound and that the logical inference is not valid. "Truthers" expect people to ignore that and instead just count how many signatures Richard Gage has garnered with his disingenuous presentations.
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Watch the video. A large section of the building collapsed from the fire alone. n/t
cpwm17
Aug 2014
#53
Of course it free fell, with the help of all the floors above where the planes hit.
IronGate
Aug 2014
#7
"I'm not the one, however, making mistakes about fundamental physics concepts." Yes you are!
wildbilln864
Aug 2014
#65