by Scott Creighton (archived reposted from Aug. 11, 2009)
(I have also added a link to the archived version of this article here)
(I have also added a link to the archived version of this article here)
***UPDATE***
At the end of this article, I have added a plan view layout and
cross-section of what I hypothesize as the potential det cord layout
plan for a typical WTC floor. Scott has asked how the cord may have
been used, so I thought I would include the drawings.
————–
In yesterdays article titled “The 23,000 Missing Trusses of 9/11“,
I questioned why it is that I can’t seem to find one single truss (of
the 23,300+ of them from the Twin Towers) in all the photos of the
debris and the clean-up process at Ground Zero. I went further and
hypothesized that the missing trusses may in fact be the mysterious
“tons of iron-rich (read as “steel”) spheres” that Jones and others have
found. It would seem a logical assumption.
As odd as their
absence from the debris field is, when you understand how these truss
sections were fabricated and installed, it makes the story of the
missing trusses an even greater mystery. And perhaps an even bigger
clue.
The 6,000
High above the
Manhattan skyline, in the early 70’s, over 6,000 of these prefabricated
floor sections were hoisted by construction cranes and then set into
place by union steel workers fabricating the World Trade Centers. On
Sept. 11th 2001, according to the official record of that day, they
simply fell and in so doing, disappeared into the history books as if
they never existed.
I for one, would like to know how that is possible.
They were fabricated elsewhere and lifted and set in place by the construction cranes, as pictured.
Some consisted of 3 trusses but most were made up of 4.
18′ wide by 60′ long,
they were welded together along with the transverse mounted trusses (3
Bridging Trusses you can see in the picture) and the corrugated metal
floor pans that the concrete for the floors was poured on top of.
“Two or more beams will be preassembled with steel decking and erected as a unit, to save erection time...” Engineering News Record
I reported yesterday
that the trusses were made of A-36 structural steel. I was wrong. The
columns were made of A-36 structural steel. The trusses were made of
High-strength low-alloy
(HSLA) which is quite a bit stronger than even A-36
structural steel, with a yield strength of up to 80,000 psi as compared
to the 35,000 psi of A-36.
“Clear span of the floorbeams is as much as 60 ft. They will be fabricated of high-strength low-alloy steels.” Engineering News Record“Their (HSLA steels) yield strengths can be anywhere between 250–590 megapascals (36,000–86,000 psi). Due to their higher strength and toughness HSLA steels usually require 25 to 30% more power to form, as compared to carbon steels.” Wiki
So in fact, the trusses themselves were made of stronger and harder metal than the columns were.
We know that the
floors were brought in an set in place in sections, not just because the
article from Engineering News Record says so, but also because we have
photographic evidence that supports the claim.
In the photograph
above, you can clearly see the floor sections are being set in place and
one of them is laying on the lower floor (left side) waiting to be
lifted installed.
When they were lowered
into place as a prefabricated unit, they were bolted then welded to
both the interior core columns and the exterior columns at the
spandrels.
Then the next section
would be brought in and it would then be bolted and welded in the same
manner, but also then welded to the previous floor section at the floor
pan and the transverse mounted trusses.
The end result, per floor, would look something like this prior to the pouring of the concrete floor.
Now why is all of this important?
According to the
official explanation of the collapse of these two buildings, the upper
section fell down on the lower, intact building, crushing the concrete
into dust, and destroying the structural integrity of the building.
But no amount of
pressure that could possibly have been generated by the upper block, or
“piston”, can explain the virtual disappearance of the floor systems you
are now looking at.
So what you should
see, if nothing else, is at least several thousand of these lying
scattered about the Ground Zero debris field.
Allow me to put this another way.
The standard size of these was 18′ x 60′. That equals 1,080 square feet of surface area for the floor pan.
A football field is 360 feet by 160 feet. That equals 57,600 square feet of surface area.
With those dimensions,
it would take only 53 of these floor sections to cover an entire
football field. There were about 4,400 of these 60′ floor sections used
to make the 220 floors of the Twin Towers.
That means that with just the 60′ sections alone, there were enough of these floor sections to cover 83 football fields. 83.
And again, I ask you, do you see anything that even resembles the floor sections (much less, 83 football fields worth of them)?
With 20 60′
prefabricated floor sections and 8 35′ sections per floor times 110
floors of each of the two World Trade Centers, that comes to
over 6,000 welded floor sections
that had to have “fallen” to the ground on Sept. 11th 2001.
I ask you to find one. Just one.
I can find them for
you. Steven Jones already found them for you (he just called them
something else) as did the RJ Lee study and the FEMA report.
Now the question is,
what could have turned the prefabricated floor systems into tons of
“iron-rich” spheres in the blink of an eye?
***UPDATE*** As per Scott’s question, here is a hypothetical det cord layout plan view for one of the floors of the WTC.
In this drawing, the
PURPLE lines are the theoretical det cord locations, the BLUE lines are
the trusses, and the columns are in RED.
Now for a cross-section of where the det cord could have been placed in relation to the trusses and the concrete floor systems.
I hope this answers your questions Scott.
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