Wouldnt the sand be more diffuse?
I have read the paper. My comments so far have been my interpretation of that which are according to you are wrong.
Zdeněk Bažant & Yong Zhou said:The details of the failure process after the decisive initial trigger
that sets the upper part in motion are of course very complicated
and their clarification would require large computer simulations.
For example, the upper part of one tower is tilting as it begins to
fall (Appendix II); the distribution of impact forces among the
underlying columns of the framed tube and the core, and between
the columns and the floor-supporting trusses, is highly nonuniform;
etc. However, a computer is not necessary to conclude that
the collapse of the majority of columns of one floor must have
caused the whole tower to collapse. This may be demonstrated by
the following elementary calculations, in which simplifying assumptions
most optimistic in regard to survival are made.
For a short time after the vertical impact of the upper part, but
after the elastic wave generated by the vertical impact has propagated
to the ground, the lower part of the structure can be approximately
considered to act as an elastic spring. What is its stiffness C?
It can vary greatly with the distribution of the impact forces
among the framed tube columns, between these columns and
those in the core, and between the columns and the trusses supporting
concrete floor slabs.
For our purpose, we may assume that all the impact forces go
into the columns and are distributed among them equally. Unlikely
though such a distribution may be, it is nevertheless the
most optimistic hypothesis to make because the resistance of the
building to the impact is, for such a distribution, the highest. If the
building is found to fail under a uniform distribution of the impact
forces, it would fail under any other distribution. According to
this hypothesis, one may estimate that C≈71GN/m (due to unavailability
of precise data, an approximate design of column
cross sections had to be carried out for this purpose)
I think he's looking for CliffsNotes.
You might just push NB over the edge linking that one.
I have read the paper. My comments so far have been my interpretation of that which are according to you are wrong.
Hey, we can always haul out the video of the excavator dumping a load of water on a car again.
Really, I think that this is the problem. If someone on the 'truth' bandwagon sees water cutting steel, they are simply unable to relate it to 'aluminium wings cutting steel' and so on. These folks have (to paraphrase tfk) a flawed epistemology. They can't answer simple questions, can't reason. It bums me out.
That was fun!
Here you go!!
http://www.youtube.com/watch?v=FM9FeEgI0Eo
Someone please embed this please. Thanks.
Wut?
Deja vu-vu-vu.
Perhaps I spoke out of turn. If I see the same pics again I might come totally unglued. Then again I'm already a little unglued.
Mother of God... I just read through the second page of this thread. We have yet another guy who doesn't understand that Bazant never claimed his model reflected the real world? We have yet another genius who cannot understand the concept of "if it can happen in this case, it can happen in all other lesser cases"? Again?
... classic, "failed to take physics" statement made before you are smashed by sand and lead ball for good measure.Intact vs not intact matters. I'd rather someone drop fifty punds of sand on my head than a fifty pound lead ball. On 911 upper portion doesnt appear intact.
You're so quick to assume that they are two different people. I'm a skeptic. All new posters are socks of old ones until proven otherwise.
I'm afraid the sarcasm I intended when I italicized the words "another" and ended with "Again?" was a bit too subtle. Yes, I'm aware of how few actually "new" people there are who defend conspiracy fantasy. And I'm equally aware of the lines of argument certain repeat offenders take. What I was trying to do was be sarcastic and ironic. Looks like I failed. Sorry.![]()