reply to post by spw184
Here's a fact:
Excepting the three 9-11 collapses, no fire, however severe, has ever caused a steel-framed high-rise building to collapse
Lets elaborate before captain half-fact steps in.
The first tower to collapse. If you need to load up a video. Watch how the top of that building, above the impact zone, tilts and twists as it
starts to come down. This is what you would expect from a building built to withstand a direct impact by a jet liner. The top half tilts towards the
damaged section and basically slides off.
That is where the normal reaction stops. What should have happened next is the top of that building crashed down into the street, causing a lot of
damage, but leaving the core and lower sections of the tower standing.
Instead, we had total collapse of bother towers, the second not even burning as long as the first, and the second is a better example, there is no
tilting towards the damaged section, it comes straight down into itself offering very little resistance.
Then we move onto building 7. No plane hit this 47 story building, just debris and light office fires. This building also collapses straight down
into it's basement falling at free fall speed for several seconds.
Now, lets say the jetfuel didn't burn up immediately like it did. Lets say, some how, the hollow aluminum place which disintegrated on impact
actually tore out the center core columns, which it didn't. Lets also say that office fires, which burn unevenly and at low temperatures, burned
evenly over the entire floors and hot enough to melt steel (meaning they burned at least 1000 degrees hotter than possible).
So what happens? Well what should happen is the top half collapses leaving the undamaged lower floors standing. Some would indeed be damaged but the
top section only has gravity as a factor, and with each floor it encounters it SHOULD meet resistance, slowing the collapse and eventually the debris
takes the path of least resistance, instead of going through steel and concrete it falls over the edges and takes the nice easy empty air path
None of this happened. Just some small buildings have collapsed due to extreme fires. No steel framed sky scraper has. Plenty have suffered more
severe and prolonged fires an didn't collapse. the collapses we witnessed on 911 simply do not fit with physics and you have to imagine, and pretend
The top half of a building can not travel through the lower half at the same speed it would through air, it's physically impossible. The only
solution to that is removing the resistance below, once you damage the core of the building so it offers little resistance, you can use a gravity
fueled collapse to do the job.
Without damage to the core structure, the floors would collapse above the damage point and nothing more, no more weight as it should come sliding down
None of the answers provided by popular mechanics or the NIST report fit with physics and the structure of the buildings themselves.
sure, you can say no other building was hit by a plane. you'd be wrong, it has happened, and in New York, and is the reason the WTC was constructed
as it was.
You can say no other building had it's core columns damaged (but the popular mechanics animations clearly show the plane being shredded by those very
core columns as it's mostly aluminum.) but you'd be assuming the core columns were damaged by, for all intents and purposes, a baked potato wrapped
you can say no other building had it's fireproofing stripped away.
Fine, you can have that one. But my friend, what about building 7? What is to be done with this pesky building 7 ?