How it Was Done: 9/11 and the Science of Building Demolition

http://www.dailypaul.com/298360/at-last-how-it-was-done-9-11-and-the-science-of-building-demolition

As public awareness grows about the truth about 9/11, it serves to point out that many features of the towers' destruction fit perfectly with standard patterns of demolition. Evidence which at first seems puzzling is in fact consistent with known demolition techniques.

WTC 7 differed from Towers One and Two in that WTC7 was a traditional "bottom-up" implosion. The Twin Towers, on the other hand, exhibited the more unfamiliar pattern of a "banana peel" demolition, which starts at the middle or the top of a building and progresses downward. The below demolition in China shows the pattern of streamers of arcing debris that we see coming from the Twin Towers, as the cutting of supports begins high above ground level and works its way down.

Banana Peel Demolition in China next to Twin Towers
[video=youtube;jO15CXhsTM4]https://www.youtube.com/watch?feature=player_embedded& v=jO15CXhsTM4[/video]


Banana peel demolitions are used for taller, narrower buildings, where there is danger of the building tipping over should the bottom be cut and the rest of the sequence not execute perfectly.

But first, just how does a demolition work? Students of the truth about 9/11 will not be surprised to learn that it essentially is the art and science of causing to happen what cannot happen without careful planning and engineering: all key structural supports in a building must be cut at essentially the same time, so that all pieces are falling at free-fall acceleration through thin air. In the below images we see the principle support columns in the "core," an extensively cross-braced steel assembly which served as the backbone of the towers, and held 70% of the weight.


Twin Tower core backbone under construction





One standard technique is the use of "cutter' and "kicker" charges, in which the first set of charges, the cutters, cut the steel beam supports at precisely timed intervals, and the kicker charge "kicks" the cut piece outward. In all the film evidence of the Towers' destruction, straight, cleanly cut pieces of steel beam can be seen spinning outward from the Towers at explosive speeds, across an area at least three times as long as the Towers are wide.


Cut Steel Being Hurled Laterally at Speeds up to 80 MPH
[video=youtube;cBTGMhRT_p0]https://www.youtube.com/watch?v=cBTGMhRT_p0[/video]

Photo: debris field width



Physicist David Chandler Narrates North Tower Demolition
[video=youtube;nUDoGuLpirc]https://www.youtube.com/watch?v=nUDoGuLpirc[/video]


Using this technique, the pattern of debris one would expect to see lying on the ground after the destruction would be cleanly-cut, straight steel pieces, rather than twisted, heat deformed pretzels of steel as implied by the official "steel got soft and buckled" story. Exactly as predicted, an aerial photo of the debris field shows a thick carpet of arrow-straight, cleanly-cut lengths of steel beam, flung hither and yon.


Aerial View, Steel Debris (close up from photo below)






Use of Thermite

In its famous attack on skeptics of the official 9/11 story, Popular Mechanics held that the melting agent thermite had never been used in a demolition before. Ironically it had, on the Chicago Sky Ride in 1935. It was reported in Popular Mechanics.
Thermite works by melting through steel like a hot knife through butter, illustrated in the video below.


Thermite vs. Car
[video=youtube;rdCsbZf1_Ng]https://www.youtube.com/watch?v=rdCsbZf1_Ng[/video]


Reaching temperatures of 5,000F, thermite can be expected to produce large pools of molten steel and iron. This is exactly what was found, to the puzzlement of rescue workers, in the basements of the Twin Towers.

Relatively slow burning thermite would have been used to weaken strong points in the structures, such as mechanical floors, prior to demolition. So it is of interest that in WTC 2, molten steel seen dripping at around floors 80 and 81 corresponded somewhat, but not exactly, to the mechanical floors at floors 75-77, below.


WTC2 South Tower on 9/11 Molten Metal North-East Corner
[video=youtube;OmuzyWC60eE]https://www.youtube.com/watch?v=OmuzyWC60eE[/video]


In the following video demonstrating the use of thermite, the characteristic dripping of molten steel can be seen which exactly replicates, in color and consistency, that seen coming from the towers on a larger scale.


Thermite vs. Steel Plate
[video=youtube;v0qnHlVTaVs]https://www.youtube.com/watch?v=v0qnHlVTaVs[/video]


Another interesting use of thermite can be seen the moment just before each demolition when the perimeter columns around the impact areas seem to bow outward, giving the impression of overload. Thermite melting the core columns so that all load is transferred to the perimeter columns would give precisely this effect.

Molten iron and steel was not observed dripping from the building until about ten minutes before destruction. This would be when firefighters were reporting that the fires were under control and almost out.

One thing which stands out about the presence of molten steel in the basements is that it stayed molten for so long, reported for weeks and even months afterwards. This would require a powerful exothermic reaction, hot enough not just to melt steel, but to raise its temperature considerably above melting point in order for heat to be stored, in the same way that water brought to near boiling cools down into the solid state of ice far more slowly than water at room temperature. With the melting point of steel at 2800F, and the thermite reaction reaching temperatures of 5,000F, the reaction would produce enough heat-energy to keep steel molten - i.e. in liquid state - for long periods of time.

Thus the evidence again fits what we would expect to find in a demolition that was a combination of thermite, and cutter and kicker charges.

CONTINUES BELOW

 

An example of the use of linear-shape charges, i.e. cutter charges, is below, along with a manufacturer's catalog image.

Linear Shape Charges, "Cutter" Charges

http://www.mil-spec-industries.com/Mil-Spec-Industries-Produ...


A video simulation of the Towers' inner structure posted at Youtube includes an illustration of a cutter-kicker sequence.

Click on images to go to Youtube video, sequence begins at 7:20
1.

2.


Below is an example of a cutter charge cutting through a steel beam.

[video=youtube;OH4--tFosoM]https://www.youtube.com/watch?v=OH4--tFosoM[/video]

Demolitions Expert Tom Sullivan

A demolitions expert formerly with Controlled Demolitions Inc. (CDI,) which was contracted to help with the clean-up phase at Ground Zero, said in an interview:

"Fire cannot bring down steel-framed high rises — period."

​

Tom Sullivan grew up with the son of Jack Loizeaux, president and founder of CDI,and a pioneer in the controlled demolitions industry. In an interview with Architects and Engineers for 9/11 Truth, Sullivan stated:

"that he knew from the first day that the destruction of World Trade Center Building 7 on 9/11 was a classic controlled implosion. Asked how he thought it might have been done he posited, “looking at the building it wouldn’t be a problem — once you gain access to the elevator shafts…then a team of expert loaders would have hidden access to the core columns and beams. The rest can be accomplished with just the right kind of explosives for the job. Thermite can be used as well.”

​

Sullivan said:

"I mean, come on, it was complete destruction. I've seen buildings fall like that for years -- that was the end game for me."

​

The means of igniting and controlling the demolition suggested by Sullivan, interestingly, coincides with the one proposed in an early hypothetical blasting scenario by Jim Hoffman, an artificial intelligence engineer. In the section "Control Architecture" of the scenario Hoffman posits:

Control Architecture

​

Ignition of the incendiaries and detonation of the explosives is controlled through a wireless network using RF repeaters on every floor of the Towers having pyrotechnics.

Each of the Stage-2 pyrotechnics units -- the kicker charges and explosive sheets -- has an integrated wireless detonator card that includes a 2-channel RF receiver, an accelerometer, logic, dual wafer batteries, and a micro-detonator...

The detonator cards are programmed to respond only to RF signals on the network's broadcast frequencies that have specific codes. The cards are manufactured in batches of cards with identical codes, where each batch has a unique code and is destined for a specific floor of one of the Towers.

Of a detonator card's two channels, one provides the arm signal, and the other provides a detonation signal. Once the arm signal has been received, the detonator will be triggered by either of two events: rapid acceleration detected by the accelerometer, or receipt of the detonation signal.


​

Below is an image of this kind of system currently on the market for CD companies, published at ae911truth.org (Architects and Engineers for 9/11 Truth.)

Wireless Detonation System



Conclusion

Once 24/7 access to the towers' interiors and the rest of the WTC complex has been established, the planned destruction of the Twin Towers and Building 7 becomes a task for which all technology is well-developed and available. Access is established through Marvin Bush, the youngest Bush brother, who was on the board of Securacom, the company which held the security contract for the World Trade Center complex. According to Barry McDaniel, CEO of Securacom, the company held the contract for security “up to the day the buildings fell down.”

The nexus which seems to connect many of key players in the 9/11 plot is the neoconservative think-tank Project for a New American Century (PNAC.) PNAC, whose members included Dick Cheney, Donald Rumsfeld, Jeb Bush, Elliot Abrams, Paul Wolfowitz, Richard Perle, Douglas Feith, Zalmay Khalilzad, Scooter Libby, and Richard Armitage, had been openly advocating for an invasion of Iraq since the Clinton administration.

Dov Zakheim, another member of PNAC, had been awarded the contract for the first WTC bombing investigation in 1993. The investigation was done by a fully-owned subsidiary of Zakheim's company SPC, Tridata. The contract assured that not only access to the towers was secured, but also floor plans, blueprints, and all other intimate technical knowledge of the buildings.

Zakeim, who was appointed Comptroller of the Pentagon by Bush upon taking office, was also in charge of the Pentagon's finances at the time $2.3 trillion was announced missing from the Pentagon, on September 10 the day before 9/11. Needless to say, after 9/11 "the day the world changed," the story was dropped from the media.

In another coincidence involving Zakheim, his company SPC (of which he was CEO and main shareholder) also invented remote 'anti-hijack" technology, by which an airliner's controls could be seized from the ground to foil hijackers. This technology has obvious ramifications for misuse in the wrong hands.

In a city like New York, the world's most dynamic metropolis, the "city that never sleeps," extra work crews, maintenance crews, technicians, and delivery trucks working round-the-clock would not be noticed. Nevertheless, some people did notice certain unusual events, such as a series of "power downs" and a generally unusual amount of activity in the months before 9/11. In the below video a worker describes a "power down" condition days before 9/11, which would have disabled security cameras and alarms.


Worker Describes "Power Down" Days Before 9/11
[video=youtube;-I2FO8bLR2Y]https://www.youtube.com/watch?v=-I2FO8bLR2Y[/video]


One favorite contention of defenders of the official story is that the aircraft impacts would have set-off or destroyed explosive charges. But the loss of a number of charges would be of no consequence in a redundantly "wired" impact zone, since only specific encoded signals could actually arm and trigger the entire detonation sequence.

As Col. Bob Bowman once said: "If they have nothing to hide, why are they hiding everything?" The immediate, illegal destruction of 99.5% of the steel evidence, shipped to and melted in China, ensures that the vast majority of the steel can never be examined and tested to either confirm or disprove the presence of the above demolition techniques. This alone, said Bowman, is evidence of guilt.

Some kinds of thermite can be applied in a "sol-gel" solution, which can be rolled on like paint, or fireproofing. Think how inconvenient, then, to have steel beams examined and found to have layers of residual thermite paint. It is no wonder that putting the steel onto ships bound for China, immediately, was of the utmost importance, even if it represented felony destruction of evidence.

In the end the testimony of firefighters and other responders, like Firefighter John Schroeder below, stands as the most powerful indicator of what happened that day. Schroeder, who says he does not believe the official story, and who was on the 24th floor of the North Tower, reports explosions rocking the building from the inside, as it seemed to "disintegrate" from the core and the stairwells. This is precisely the part of the structure which would be most critical to weaken before a final demolition sequence.


Firefighter John Schroeder
[video=youtube;DBb00PQR1zo]https://www.youtube.com/watch?v=DBb00PQR1zo[/video]


There is no shortage of testimony corroborating Schroeder's description of explosions throughout the morning, which might correspond to the preliminary weakening of the buildings' strong points. Not one of these reports of explosions was included in the official 9/11 Commission report.
One such explosion is captured on video below.


Explosion
[video=youtube;y2vxj2yxfAM]https://www.youtube.com/watch?v=y2vxj2yxfAM[/video]


The audio evidence includes footage of what is clearly an accelerating demolition sequence, below.

Explosive Sequence, South Tower
[video=youtube;uxB7R-z6E1I]https://www.youtube.com/watch?v=uxB7R-z6E1I[/video]


Other anomalies and coincidences in the evidence of 9/11 continue to arise, and together with the above demolition hypothesis continue to provide clues as to just how it was done.


This essay is dedicated to Colonel Dr. Robert Bowman, (1934-2013,) without whom the movement for 9/11 truth would not be where it is today.

 

we've already been over your blizzard of bullsh numerous times before....


Why didn't the fire set off the 'cutter charges' prematurely?

Why wasn't there evidence of these 'cutter charges' in the pile?

Why wast any of the wireless demo gear found in the pile also?

Why again would they use wireless detonation in a city with the most spurious RF sources on the planet?

Marvin Bush left securacon months before 9/11 http://www.abovetopsecret.com/forum/thread960968/pg1 And the WTC had it's OWN head of security,the last one was John O'Neil,who died in the collapse....


You truthers astound me....you seem to revel in the fact that you know SO much,that just isn't so

 

Here's some more info. Start watching at the 2:53:11 time mark.

September 11 -- The New Pearl Harbor (FULL)
https://www.youtube.com/watch?v=8DOnAn_PX6M

 

It is so sad that people actually believe a controlled demolition was possible on 9/11.

So much for the age of reason.

 

The truthers are the only people that have live brain cells. The deniers are like those in Nazi Germany who believed Hitler's false flag operation wasn't planned by Hitler and company.

How anyone can look at those buildings coming down, and think it was pancaking, shows that some people may as well not have eyes. For they will not believe what they eyes are telling the owners.

Those building were rigged to come down, and obviously they knew before hand that many americans could and would never believe it was planned by people in the US gov't. And they were right. There is more than enough proof that the 9-11 commission were a bunch of people covering up for others, and that it was a farce from the get-go. There are enough ex military men, ex cia men, ex fbi men, that have come out and said this was a conspiracy, committed with the help of those islamists, yet the deniers dismiss those as well, preferring to believe the official story, and refusing to connect the plethora of dots and evidence, that shows this to be a conspiracy.


What is bothersome about this, is not the conspiracy, but the fact that so many americans are like blind herd animals, without the ability to logically question this event. So, we now know, that there isn't anything that can be done, that but a few of americans would ever pick up on, and see the bull(*)(*)(*)(*), and not buy into it. I see nothing but utter and complete stupidity with these deniers. And no pill with fix that. And the bad news is, these same people vote!!! Lord help us.

 

No, it is dangerous that so many people believe in that (*)(*)(*)(*) and bull official story. I guess those 2200 professionals are stupid? When you can get 2200 professionals together to try to show this was a conspiracy, and the deniers dismiss them....well, we are in really deep (*)(*)(*)(*). Deep (*)(*)(*)(*) caused by utter stupidity. You will never get 2200 men again, to question something like this. And its not like they are plumbers or ditch diggers. Yet, the people here who dismiss them, are nowhere near their league in expertise. We literally have non experts, calling the experts dumb!! That is how stupid this entire argument is.

I understand that many people will never believe that men in their own gov't would stoop so low as to do such a thing, in order to drum up reasons to invade the middle east. But the germans in Nazi Germany before hitler got himself into power would have never believed what came from those Nazis either. How anyone could trust the same men who sold this nation out, to the globalists, hollowing out the middle class, causing FDR, Truman, Ike, and JFK, to turn over in their graves, over the treason committed upon the American people, shows you just how disconnected these deniers are. They have brains, but will not use them. It is indeed a psychological condition, where the event would be too incredible to ever accept. Except it happened, and it wasn't due to just fires. Fires have never ever brought down buildings, not 1, but 3, in such manner. But that means nothing either.


The only people with a working brain, or some of the truthers, like the 2200, like the ex cia, ex fbi, ex military officers, and the police and firemen who were on the scene that day. Yet, the deniers dismiss them as well, and instead believe in what the people who did it, are saying. You cannot make this (*)(*)(*)(*) up, it is so absurdly ludicrous.

The fact of the matter is, there is no evidence whatsoever that would ever convince these deniers as to what really brought those buildings down. And so, let us hope one day there will be enough of those with living brains that will somehow get this investigated, by an independent group, so that the truth is finally known, and we can imprison those responsible. And hopefully all of the deniers will then commit suicide, so we can clean up the gene pool, going forward, and get rid of the inferior brains.

Also, I was a denier until last year. But when you get ex military officers, ex cia men, ex fbi men, firemen, cops, and 2200 professional calling out the official story, only a brain that doesn't work would still deny what happened. You guys really do need to get your heads examined. Seriously.

 

Short answer. AE911T are just cranks and I can direct you to many papers in support of the accepted version while you can show me none from AE911T. There are many experts who think Gage and his sycophants are cranks.

http://www.reddit.com/r/skeptic/comments/294k95/compilation_of_scientific_literature_that/

A red herring and a Godwin. Irrelevant

http://en.wikipedia.org/wiki/Godwin's_law
http://en.wikipedia.org/wiki/List_of_fallacies

Who are these globalists? And what is the nature of your alleged treason?

And that is just a chrome plated ad hominem and of no value.

Ah, the first time in history canard. No buildings of such design had ever been exposed to such attacks, nor left without a water supply to fight the fires as in WTC7 either. But that doesn't seem to mean anything to the partisan views of 9/11 truth.

Straw man and lies, and an argument from incredulity.

When will 9/11 truth supply evidence? I've been waiting years.

And more arrogant ad homs.

Save your dumbass insults for someone who might swallow your bull(*)(*)(*)(*). That was just an arrogant and moronic rant full of false generalisations. Your whole post is just an attack on those who oppose your nutty beliefs and actually has no substance at all or merit. All you have are ad hominem attacks, arguments from authority, arguments from incredulity, false generalisations and no evidence to support your claims.

How about you get back to me when you can discuss the matter without all the infantile tactics and nonsense? I'm not interested in your opinion of those who don't follow your particular brand of nuttiness.

 

Oh lord....another one who thinks people who don't swallow thir crap is a 'herd animal'......ZERO imagination

 

Is this treatise is supposed to demonstrate a superior intelligence? How do you reconcile your professed intelligence, with all the logical errors you've made?

 

How did they roof the buildings with thousands of pounds of explosives and thousands of miles of wire, and not one person see it?

Answer that and we can continue the discussion

 

I have decades of experience in the design and demolition of buildings.

How about you? What's your experience?

 

I'm one of those same professionals and call BS.

2200 is a far stretch, especially when you start looking at their actual credentials.

They definitely stretched the term "professional" in order to get their number up.

 

It is real curious how those 2200 "professionals" fail to discuss how the steel must be distributed down a skyscraper just so it can hold itself up for decades. They don't seem to be demanding that information from "Authority" to solve this problem either.

psik

 

well for some reason the port authority is roadblocking foias on it.
So here I sit with access to an ansys station, which is a fairly robust fea cad system, only to discover there is no "hard" data to put in it.
I suppose like 7, public scrutiny would jeopardize government safety.

 

But there are skyscrapers all over the planet and 50 buildings over 1000 feet tall have been constructed since 9/11. So shouldn't these "professionals" be able to calculate reasonably good estimates from scratch?

How do "professionals" not make other "professionals" look ridiculous in 13 years?

Shouldn't "professionals" on both sides of the issue have admitted by now that accurate data on the distributions of steel and concrete are necessary to do something as simple as compute the Potential Energy of any skyscraper?

psik

 

red herrings.....

 

Name calling without explaining anything is so intellectually impressive.

psik

 

Er, it's not name calling but an observation of the content of your posts. A Red Herring is a logical fallacy.

 

I called you a name?

Stop whining

 

The same way you "name call" the "professionals" and "authorities" and then run away from answering for your mistakes?

When are you going to actually take the time to educate yourself, rather than simply question and then ignore the answers?

 

Skyscrapers having to be strong enough to hold themselves up and the equation for Potential Energy are logical fallacies?

So calling something a logical fallacy when it isn't is not name calling?

psik

 

I'll wait until the "professionals" and "authorities" can make decent physical and computer models that can actually collapse in under 30 seconds.

It only took 4 months in 1940 to make a model duplicating the oscillation of the Tacoma Narrows Bridge. Maybe it was because they didn't have electronic computers to confuse themselves with. But now they can't even come up with trustworthy potential energy figures for the towers. How can they without accurate steel and concrete distributions? Are skyscrapers bottom heavy or not?

psik

 

No, I said that a Red Herring is a logical fallacy. Wow, the comprehension....

No, that would be an 'error'. I didn't even bother to check if you used a logical fallacy or not; I just pointed out that identifying a logical fallacy is not 'name-calling', or an ad hominem in formal terms.

 

Why is it you refuse to understand the limitations of physical models? The model of the Tacoma Narrows Bridge did not "duplicate" the oscillation of the bridge. How could it? It wasn't the same length, mass, or strength. It was a tool to help understand turbulence, which you know what, we still don't understand. They built the model before the bridge collapsed to try and figure out how to stabilize the bridge. If you honestly think the bridge duplicated the oscillation and failure of the bridge then explain this statement:

How could Farquaharson say this if the motion did not result in the "end" of the model?