@parados,
Quote:The Windsor Building wasn't hit by an airplane that destroyed some of the uprights causing the others to have to carry more load. The airplane also blew off much of the sprayed on fire protection that would have still existed in the Windsor building.
Let's see.. steel protected by coating lasts 18 hours. Steel not protected by coating lasts only 45 minutes. That kind of gives you an idea how IMPORTANT fire protection is in a building, doesn't it?
WTC7 wasn't hit by an airplane yet it went straight down like a stone. How could this happen when there were only fires here and there and nothing even remotely like the raging fires in the Windsor Building?
What are the chances that when a building, [three of them actually, in one day!], in situations like this, reaches the point of failure, that that failure is going to result in a straight drop? Purty damn small considering that the fires were not that hot, nor were they widespread.
In WTC2, there were firemen reporting from the very floors and areas that were supposedly in some kind of a giant conflagation.
"blew off much of the sprayed on fire protection", Parados? Even the NIST says they can't really know how much was "blown off".
Do you happen to know what the insulative material used was?
About those "uprights",
Quote:In July of 1971, the American Society of Civil Engineers (ASCE) presented a national award judging the buildings to be "the engineering project that demonstrates the greatest engineering skills and represents the greatest contribution to engineering progress and mankind."3 Others noted that "the World Trade Center towers would have an inherent capacity to resist unforeseen calamities." This capacity stemmed from the use of special high-strength steels. In particular, the perimeter columns were designed with tremendous reserve strength whereby "live loads on these columns can be increased more than 2,000% before failure occurs."
Quote:Additionally this summary states that the perimeter columns softened, yet your findings (NIST) make clear that "most perimeter panels (157 of 160) saw no temperature above 250C".
To soften steel for the purposes of forging, normally temperatures need to be above 1100C (6). However, this new summary report suggests that much lower temperatures were be able to not only soften the steel in a matter of minutes, but lead to rapid structural collapse.
So the vast majority of perimeter columns, just a hair over 98% of them, saw temperatures that were nowhere near the softening point for steel.
How do two buildings go down when nearly all the columns were not subjected to any dangerous temperatures,
with or without insulation and there was a 2000% safety factor?