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Originally posted by kidtwist
Why were there no body parts? Just small fragments, and then only 1/10 of the people that supposedly died that day were identified?
Originally posted by exponent
What is this supposed to mean? Steel is not infallible, and concrete will almost always do very much better in compression. Of course you can drop steel on steel and get deformation and damage.
In compression, steel is more than 10 times stronger than concrete, and in tension, more than 100 times stronger.
Have you read the paper I linked you to yet? How is it that they managed to get a handle on this 'impossible' pheonena?
Originally posted by plube
what it shows is the upper block undergoing a huge crush up which right there means the progressive collapse put forward by Bazant would not occur and the collapse would actually stop due to the loss of mass.
just a note....those are frames from the sauret video....it is about 28fps that is 10 frames so you are inteligent i am sure you can do the maths on that one.
do you see the problem for bazant here...the apparent rigid block c has already progressed (noting that there are another three floors lower on the white lines...i just could not fit them in as it already progressed off screen)
has not even started to crush down on the lower block. the mass has already disintegrated...note the bottom of the red line to the right the height of the original block.
Also notice the scale to the right...it is the height of each floor...what does this tell us....It tells us the block is under constant acceleration.....even when the should be an aparent deceleration at point of impact on the lower structure....Is this what is observed.....oddly not...the only reason i can think of this occurring is the core has already been compromised...and is giving no or very little resistance.
edit on 043030p://f26Friday by plube because: (no reason given)edit on 043030p://f31Friday by plube because: (no reason given)
Originally posted by plube
reply to post by ANOK
That is why the white layover is tilted
Originally posted by plube
because i stated that if you look what happened and i showed you pics seconds after the collapse initiated that the entire mass of upper block c has disintegrated...so therefore that negates Bazants paper
Originally posted by ANOK
It means what it means. I never said steel was infallible I was just pointing out facts that effect collapses. I'm not surprised you didn't understand that though.
Concrete does better in compression than steel? No it doesn't. Concrete is strong in compression but very weak in tension. It doesn't mean it is stronger than steel in compression, and steel is also very strong in tension. Steel buildings have about the same thermal mass as equivalent concrete buildings.
So will you re-think your opinion, or just ignore this as you usually do and move on? How about some honesty for a change in this discussion?
I'm not going to wade through a paper you linked to. Please simply quote what you think is relevant and we can discus it. That is phenomena btw.
Originally posted by exponent
I love this desperate scrabble to pick a preferable metric and then insist that's what is most important. If we believed your logic we'd have to ask why every single building isn't made out of steel. The answer of course is that concrete in compression is often far superior to steel as the 'failed demolition' videos show.