Orangedogsrule
PULEEZE LET SMOKEY WIN!!!
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I don't doubt any of that one bit. But how many things have to be done incorrectly for a building to collapse straight down at free fall speed from a fire? Has that ever happened before? And the videos of the WTC7 collapse look exactly like every controlled demolition video I've ever seen. I just haven't seen any credible theory that debunks the proposition that it was a controlled demolition. And that's especially true in light of some of the audio we have surrounding its collapse.
So, what should a collapsing building look like?
The Bldg 7 traditional design using steel beams for floor support was HEAVIER per square foot than the towers that used trusses.
Think about "factor of safety". Lets say a piece of steel begins to bend in elastic deformation when a 5000lb load is applied, but it will go back to it's original shape with no damage or permanent plastic deformation that stays bent. Now while I know most precisely virtually every load this piece will ever see. I don't know them all, like how bad an earthquake it will see, or tornado winds. So I say I want my final design to be several times stronger than I think it needs to be, just in case. Because life has taught the designer he HAS to think about factors of safety. Buildings collapse. Planes crash. Bridges fall down.
Building codes say I have to. And I have to use theirs.
No designer has ever, ever designed the structural steel connections between the verticle columns and the horizontal beams of a building system with a factor of safety that could absorb the equivalent of the tonnage of the Queen Mary being dropped on it.
Take a Tinker Toy kit outside and build a tower with every piece. Set a cement block on it. Now, take sandpaper and make lots of pieces 1/2 the original diameter (fire weakened steel), take out a vertical column under the cement block.
Inertia (an object in one place must have force applied to move it to another) is really really hard to overcome. So is gravity. Things fall straight down.
There is nothing to stop the buildings collapse once it gets started. And each of the connections between floors members that gets snapped, or jerked, or whatever, in two is going to give off a report you'd liken to a cannon shot. But analysis of those actual bangs recorded does not meet with building demolition charge audible signatures.
I know it looks like "free fall" and some portions may indeed approach it. But it's not true free fall. Each floors connections are going through impact failure.
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