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okay.
you wanna do one on one, wrath?
so, the first floor impacted is equal to the the floor impacting it.
hence, they are BOTH destroyed. there is no 'thor's hammer' smashing down. it is one against one. it is not ten against one, ten against one, ten against one. it is ten against one, nine against one, eight against one, seven against one, six against one, five against one, four against one, three against one, two against one, one on one, zero.
so, you have ten floors crushing one hundred floors. get it, yet?
let's say with gravity's 'push', i'll give you two floors from above for one floor from below.
that still only crushes thirty floors, total, and it doesn't account for the fact that the cap was leaning off to the side and unable to transfer one hundred percent of it's mass onto the floors below.
sorry if i let a name slip, defender of the official story.
Yeah, and I'm still wondering why 10 floors are instantly falling together.
Can we start with just 1 floor's worth of trusses somehow all falling together? Because, even though NIST says this is an unlikely event to occur, they also say that each floor could withstand the dynamic loading of more than 5 floors.
Which leads me to a question I don't think you would be able to answer.
yeah.
there were HUNDREDS of connections. each one should failed individually(ish) in an unassisted collapse. there should have been SLOW warping and sagging. yet, we have in all three cases all four corners, and the core giving out instantaneously.
the more connections there are, the less likely that they will all let go at the same moment.
Originally posted by WraothAscendant
They were sagging and falling because the damage the planes did to the core columns that was aggravated by the fire.
The sagging and failing was because the core columns were damaged.
So if you have a break in a structure with stuff above it what will logically happen?
Especially when you bring into consideration the fact a plane penetrated 75% more or less (with parts going all the way through) way through the darn thing.
The core was a latticework of steel.
If the damage over time is enough to cause the latticework to start failing there will be a cascade effect of failure once a point is reached. As each part was NOT designed to work alone.
oh, lighten up, wraoth.
listen, here's a physics lesson.
you have to understand the difference between a solid body and a fluid one. you have to also realise the difference and effects of elastic vs. inelastic collsions.
(in the real world) you can't have the top, weakened, broken off, angled section acting as a solid body. you can have the bottom intact portion act as a solid body(once again, see "newton's cradle" to see how in absence of plastic deformation in highly elastic materials, momentum is INVERTED).
yes, there is plastic deformation. however, it is not a sole property of the bottom portion. and, with each plastic deformation, energy is effectively spent(of course, you can't acually 'spend' energy, only change it's form).
so, we have ten on 'one'(for you, because this is ABSOLUTELY UNTRUE, due to COUPLED STRENGTH, gordon ross estimated seventeen floors, IIRC), and then eleven on one, and then twelve on one....according to you. so, you assume that the top piece acts in concert, but the bottom doesn't. TOTALLY backwards.
this does not account for
a. "mass shedding" ie. stuff falling over the side, which there was literally TONS of, due to the lean(among other things like explosive force)
b. coupled strength of columns. (here's a test. pick up an anvil directly against gravity, and then hold it straight out at arm's length. why is it "heavier" at arms length?)
c. the angle of the top piece. got jenga? make a stack where the top leans as far away from the base as possible without tipping.
now, make a perfectly vertical straight stack. which one is more resistant to pressure from above OR below? because, once the 'cap' is tipped on an angle....well, HOPEFULLY you get the picture.
i don't want to insult you, wraoth. i'm sorry if you feel i am.
I'm not convinced that the NIST study of the collapses did anything more than push and pull the parameters they were comfortable with varying like force of impact and heat/extent of fires until the most extreme of these values led to collapse. Was there some evident aversion to suggesting the the buildings themselves were not as strong as certain parties would prefer them to be? (thinking about possible litigation here)
It's an obvious principle of highrise construction that each level of the intact building must support all levels above it so the bearing strength diminishes as the building rises. Where this bearing strength was concentrated was in the outer walls and the core structure but was any floor of the building any stronger than any other?
Originally posted by WraothAscendant
Like I said. Ten floors hitting one floor. Then eleven floors hitting one floor.
Sure once you get along you MIGHT lose a maybe a floor's worth (if THAT) of concrete to dusting but NOT all that much in the big picture.
Originally posted by Pilgrum
I'm not convinced that the NIST study of the collapses did anything more than push and pull the parameters they were comfortable with varying like force of impact and heat/extent of fires until the most extreme of these values led to collapse. Was there some evident aversion to suggesting the the buildings themselves were not as strong as certain parties would prefer them to be? (thinking about possible litigation here)
It's an obvious principle of highrise construction that each level of the intact building must support all levels above it so the bearing strength diminishes as the building rises. Where this bearing strength was concentrated was in the outer walls and the core structure but was any floor of the building any stronger than any other?
I'm talking about the individual floors consisting of trusses, dampers, truss seats, corrugated sheeting and 100mm of concrete which all appeared to be exactly the same as they only had to support themselves and the material sitting on them with an adequate safety factor built in to prevent an individual floor collapsing due to isolated overloading. A large falling mass will exert the greatest impact force on surfaces it meets a right angles to its motion and the vectored force on the core and walls is minimal in comparison to what those floors would experience.
Unless someone can show me that the trusses and seats in the lower floors were stronger than those in the upper floors...
The truss seats themselves seem to have made it through mostly undistorted with indication that it was the bolts that sheared allowing the trusses to be disconnected.
[edit on 29/2/2008 by Pilgrum]
That's the crux of the problem though. How did we get ten floors crushing down onto one floor in the first place? Steel bends when it looses it's elasticity. It doesn't just snap. It snaps in a dynamic loading situation but before collapse initiation, we didn't have a dynamic situation.
So, how did the columns holding up those ten floors (which have been holding them up since day one) suddenly all snap at the same time to give us your "ten floors crashing down onto one floor" scenario?
The only way I can see it would be some kind of controlled snap. Not a progressive failure. Progressive failures may be fast, but they aren't fast enough to hinder a tilting momentum.
Same would happen with a "progressive failure" that suppossedly started on one facade and wrapped it's way around to the other facades. There is no way around this.
Originally posted by WraothAscendant
Yeah, and I'm still wondering why 10 floors are instantly falling together. Can we start with just 1 floor's worth of trusses somehow all falling together? Because, even though NIST says this is an unlikely event to occur, they also say that each floor could withstand the dynamic loading of more than 5 floors.
Vertical situation? If you break something below something that it DEPENDSon to help keep it up would it not fall? Knock the supports out from under something. Down it goes.
Again I don't think you really know what you're talking about.
Originally posted by WraothAscendant
Not when the building is internally crumbling towards the top and not the bottom, it didn't reach the bottom til the collapse was almost over. Like I said Cascade Effect.
If the supports at the bottom was blown you would have what those videos were showing with the silo and the hotel.
I think I might have to put together some animations for you to illustrate what I mean. I have the feeling I am not communicating what I mean well.
But suffice it to say I think your forgetting that gravity (and the weight they hold) pulls on each individual part. When parts (especially a number of them) of it fail there is a chance it will cause a cascade effect.
Once again thank you for not being insulting.
Not to be rude, but I agree with bsbray that I don't believe you are understanding the physics. Please don't take that as destructive criticizm, but constructive criticizm. A mass dropping 12 feet from 1,000 feet above sea level will have the same kinetic energy as the same mass dropping 12 feet at sea level.