No Need for 9/11 Controlled Demolition

On this 15th anniversary of 9/11, I came across something that I’ve been repeatedly reading or hearing for the last 15 years.

“How do buildings with 250,000 tons of structural high-grade steel, four inches thick, collapse at the speed of gravity and accelerating in its speed of collapse as it came down. There is only one way that can happen and that is a controlled demolition. I lived it, I was there and I heard the explosions, but it seems every time that you share this, it gets edited out.”

What’s the answer to this question? I sometimes think of adapting the orbital simulation model I was using yesterday to look at the dynamics of the collapse of the WTC buildings.

The problem is one of working out what kind of stresses build up in the columns supporting a building when entire floors above them collapse.

massspringLooked at abstractly, it’s a question of what happens when a ball bearing of mass m (representing the mass of the floors above) is dropped from a height h onto a spring (representing the columns in the floors beneath).

Normally, the mass is resting on top of the spring, exerting a downward force m.g on it such that where k is the spring constant, and x is the length by which the spring is compressed, according to Hooke’s law:

m.g = -k.x

The engineers who designed the WTC would have wanted to make x quite small, say 1 cm or 0.01 metres,  by setting the value of k accordingly.

k = m.g/x     = m.9.81/0.01     = 981.m

The amount of potential energy, Es, that is stored in a spring is ½.k.x². And since we have set k = 981.m it follows that the mount of energy stored in this spring is

Es = ½. 981.m.x²      = 490.m.x²  ………..(1)

Now let’s look at the ball bearing that falls onto the spring. In the WTC the height between floors was 12 feet or 3.66 metres. The speed of something accelerating at g, or 9.81 m/s², after travelling 3.66 m is given by

v = √(2. 9.81. 3.66)       = 8.47 m/s

And the kinetic energy, Em, of a mass m moving at 8.47 m/s is

Em =  ½.m.8.47²     = 35.9.m        …………..(2)

And when the ball bearing lands on the spring, its kinetic energy is transferred into potential energy stored in the spring. So we can equate equation (1) with equation (2)

Es = Em, or

490.m.x² = 35.9.m

So in order for the spring to absorb the entire kinetic energy of the falling ball bearing, the spring must be compressed in length by

x = √(35.9/490)      = 0.27 metres

So a 3.66 metre high WTC column would have to be compressed 0.27 metres –  27 cm – to absorb the kinetic energy of a mass m that has fallen 3.66 metres onto it.

In principle that’s perfectly possible. But in practice it’s out of the question. And this is because civil engineers build in safety factors into their structures so that they can resist forces only one and a half times or twice what they are expected to experience. So the WTC columns would have only been designed to withstand being compressed in length by up to 0.02 m. After the compression had exceed 0.02 m, the column would have failed, by buckling or exploding. And once this had happened, it would have no compressive strength at all.   There was no way whatsoever that  a column could survive a 0.27 m compression, unless the engineers had built them with safety factors of 30 rather than 2.

So when the upper floors of the WTC fell 3.66 m onto the floors below, there was probably a fraction of a second (a few milliseconds) during which the columns below compressed like springs until they had been compressed by over 0.02 m, and they failed. And if  they failed explosively (with a loud bang), there would have been a series  of loud bangs as the columns on each floor failed, starting about one second apart, and getting more frequent as the collapse progressed more rapidly.

The WTC collapse only took a second or two longer than free fall. And that’s probably because the columns on each of its 110 floors lasted about 10 milliseconds before their maximum design load was exceeded, and they failed.

There was no need for any controlled demolition. The building was going to collapse that way anyway.

The real problem is that events like the WTC collapse are beyond most people’s experience, and they extrapolate from their personal experience (of watching controlled demolitions, for example).

But the next time a 100 storey building needs to be demolished, it might be an idea to simulate 9/11 by simultaneously blowing out all the columns on the 60th floor, and watching what happens next. I bet it would be just like 9/11.

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About Frank Davis

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40 Responses to No Need for 9/11 Controlled Demolition

  1. prog says:

    On the subject of 9/11 and collapse

    • Frank Davis says:

      Looks like she was very slightly restrained from free fall too.

      It’s getting worse and worse. If Trump had done anything like this, the MSM would be demanding that he step down as Republican candidate.

      I noticed that when Clinton and Trump were on TV last week (being questioned separately), they were seated. I really doubt that Hillary will be able to stand up during the scheduled debates between them. So I bet that either the debates will have to be conducted with her seated (and with cushions), or she’ll drop out.

      I think she’s going to drop out of the debates.

      I think her strategy now is to just run out the clock, and rely on her current support to take her over the line.

      And I don’t think that’s going to work.

      • harleyrider1978 says:

        Her Hubby always turned right about this time to the November ballot,she cant bring herself to try and get the leftist right side of the vote that’s out there by turning right. But I sure hope she takes a big fall into a fucking ashtray!

      • waltc says:

        Conflicting stories– serially. First, she was “overheated.” Well, I live here and it was a fine day, not at all hot , not at all humid and early this AM I think it was in the 70s. Then she came out of Chelsea’s place with a game face and an I feel fine, which, had it been true,would cast even more doubt on her general health since a person who’s otherwise fine doesn’t have an episode like that. Then came the pneumonia story which, were it true, would at least rationalize the episode and seem to be smart political spin. True, there’s something called Walking Pneumonia, but, given the weeks of coughing, her doctor should have/ would have caught that.

        That said, I’ll bet you a crumpet, she won’t drop out of the debate

        http://www.dailymail.co.uk/news/article-3784098/Hillary-Clinton-s-doctor-revealed-68-year-old-pneumonia.html

    • mikef317 says:

      I don’t like defending Hillary Clinton, but below (from a very left wing source) are links to two salient ideas about her medical condition.

      The first (which fits within my limited medical knowledge) is that it takes a blood test to confirm a diagnosis of pneumonia, and that test results take several days to obtain. I had a bout of pneumonia a few months ago. It is a treatable condition, and as of this writing, I’m “cured.”

      The second idea (which I’ve never heard of) is that Clinton suffers from an inability to sweat. This would explain her medical problems. It would also be easy to treat.

      http://www.dailykos.com/stories/2016/9/11/1569094/-Pneumonia-some-basics

      http://www.dailykos.com/story/2016/09/11/1568977/-Don-t-panic-Hillary-Clinton-just-doesn-t-sweat

      Questions about health are legitimate, but more is known about Clinton’s medical history than Trump’s. His doctor’s letter stating that Trump is “astonishingly healthy” and that his “physical strength and stamina are extraordinary,” sounds like something written by Donald Trump.

      • Manfred says:

        “His doctor’s letter stating that Trump is “astonishingly healthy” and that his “physical strength and stamina are extraordinary,”

        He doesn’t drink or smoke. Cripes. Don’t mention this to the WHO risk-mongers. Before we know it they’ll be sponsoring him and asking him for money at the same time.

        • beobrigitte says:

          Don’t mention this to the WHO risk-mongers. Before we know it they’ll be sponsoring him and asking him for money at the same time.
          Something like this had crossed my mind. Trump may well speak what people want to hear but he has not uttered one word what he intends to do about the leeches.
          Hopeful smokers in the US may well end up as disappointed as we were when the conservatives got into power.

      • mikef317 says:

        Walt, re your 6:55 comment above mine….

        When I was a kid (grade school and younger, in the 1950’s), I had pneumonia several times – the nasty variety of which you speak. I had fevers high enough to cause hallucinations, and was so physically weak that my parents had to help me “walk” to the bathroom.

        I think it depends on the amount of diseased lung tissue. The bought I recently had was limited to a small area of my left lung. Fever and physical weakness were minimal, and I think antibiotics have improved since I was a child.

        I assume Clinton’s test results will be released, but it sounds like she had a mild case of the disease.

  2. Tony says:

    I thought I’d try to find out what Fred Dibnah thought about 9/11 but couldn’t really find much. Nevertheless, here’s a great video of him. It seems he was very much an ‘old school’ cigarette smoker. Cigarette kept between his lips to keep his hands free for work. Something I could never manage, being a soft middle class ‘the smoke gets in my eyes’ type. He even managed to speak normally with the ciggy in place.

    • beobrigitte says:

      From what I remember Fred Dibnah had developed his job an art form over the years. That applies to his rollie constantly being in his mouth.

      The real problem is that events like the WTC collapse are beyond most people’s experience, and they extrapolate from their personal experience (of watching controlled demolitions, for example).
      I have come across some videos suggesting 9/11 was instigated by Bush. I do refuse to believe that even the most corrupt government would be capable of such a crime. But then, the WHO toddled off to Moscow for the e-cig SECRET extravaganza when Ebola was raging in Liberia.

    • Tony says:

      Yes, fascinating. I’ve no idea what really happened or who might have organised it. But I do agree that the official story seems ‘smelly’. One statement that I’ve often seen and which tends to pass without comment (including in John’s piece) is:
      ‘Osama himself was denying any hand act or part in it, but from the kind of distance and secrecy that made you think, “He would say that, wouldn’t he?”‘

      Err except I don’t think he would have said that at all. The whole point of a terrorist attack is to proudly announce that you did it and that you can do it again. If it was a terrorist attack then those responsible will want the whole world to know that they were responsible for it.

  3. wobbler2012 says:

    So the poor Yanks have got a choice between a sick evil woman and an utter lunatic, man the poor Yanks have got it REAL bad. :-(

  4. garyk30 says:

    In a controlled demo, all you do is blow out the bottom and let the rest collapse down.

    One does not start at the top.

    • garyk30 says:

      Also; if planned, the buildings would collapse in the order that they were impacted by the planes.

      The last impacted was the first to fall.

  5. Darryl says:

    On 28 July 1945 a B-25 bomber lost in fog flew into the 79th floor of the Empire State Building in New York. Why didn’t it collapse in a heap?

  6. Oi you says:

    People’s love of a conspiracy points to one thing: they have problems coping with the truth. This does not bode well. Isn’t it bad enough facing the fact that terrorists hate the west enough to do such a thing, without thinking that it must be your own government really at work? Yikes, the mentality of some people…..

    As for Oreos and crumpets, I don’t have either in my cupboards, but I have a packet of Jammy Dodgers, will that do?

    :o)

  7. Frank Davis says:

    http://www.infowars.com/dnc-to-hold-emergency-meeting-to-consider-replacing-hillary-clinton/

    The Democratic National Committee is set to hold an emergency meeting during which it will consider replacing Hillary Clinton as a presidential candidate after her collapse in New York yesterday.

    According to Emmy award winning broadcaster David Shuster, Democratic Party operatives will stage a crisis summit during which they will begin the search for an alternative in light of Clinton’s health problems – and an apparent effort by her campaign to cover them up.

    • Roobeedoo2 says:

      I wouldn’t be surprised if she drops out and Joe Biden steps up as the DNC candidate. Sanders already capitulated and probably doesn’t have enough support left having moved over to Clinton.

      Biden would represent a continuation of Obama’s policies, like George Bush senior did for Reagan.

      Just realised that this year the Hajj runs from 9th to 14th September.

    • nisakiman says:

      That would be a huge relief if she drops out. She is the most appalling woman, a harpy on steroids, and makes my hackles rise every time I see her. Her as POTUS would be the worst thing that could ever happen to the US, I’m sure.

    • harleyrider1978 says:

      Perhaps Monika can blow some life back into hitlery

    • beobrigitte says:

      The Democratic National Committee is set to hold an emergency meeting during which it will consider replacing Hillary Clinton as a presidential candidate after her collapse in New York yesterday.
      ?Lobar/bronchial pneumonia? Either way, if Hilary has some common sense left, she’ll stay in bed. Pneumonia can kill. My grandmother and my dad dies of pneumonia at the age of 41. I had lobar pneumonia when I was 41. There is nothing you can do. Whatever the virus is, you’ve got to ride it out.
      Riding it out…… I could cope with the hot/cold switch ok. What wore me down was the lack of sleep. I was exhausted.
      Yeah, I do like the idea of my body now having an additional bicarbonate shunt. However, not being able to drop off into sleep caused that to be placed into oblivion.

      In any case, Hillary either prioritizes her survival (which I did by making deals with my old GP) or her political career. And I never wanted a political career, but it took all I had to survive.

      As for politics; who cares about the people? It’s about who pulls the strings.
      I do believe the WHO is off for another extravaganza to India to save the world from non-existent tobacco “danger”. Never mind the women in India who are subjected to rape if they dare to do what I take for granted.

  8. harleyrider1978 says:

    Marijuana v.s. Tobacco smoke compositions

    From: Institute of Medicine, Marijuana and Health, Washington,D.C.
    National Academy Press, 1988

    “The smoke from any burning plant contains hundreds of chemicals that may have biological effects . . .”

    “Cannabis smoke is similar to tobacco smoke in that it is a mixture of very small particles and a gas-vapor phase. Both the particulate and vapor phases contain many identified and probably some still unidentified constituents that, based on clinical experience with tobacco smoke, must be assumed to be potentially harmful. The amounts of some materials in tobacco cigarete and marijuana cigarette smoke are compared in Table 3. Toxic substances, such as carbon monoxide, hydrogen cyanide, and nitrosamines occur in similar concentrations in tobacco and marijuana smoke; so do the amounts of particulate material known collectively as “tars”.” (pg 15)

    Table 3 : Marijuana and Tobacco Reference Cigarette Analysis of Mainstream Smoke (pg 17)

    Strange Abbr: mcg: microgram C? : known Carcinogen (X means yes)

    A.Cigarettes

    Units

    Marijuana

    Tobacco

    (85mm) (85mm)
    Average Weight (mg) 1115 1110
    Mositure (%) 10.3 11.1
    Pressure Drop cm 14.7 7.2
    Static Burning rate mg/s 0.88 0.80
    Puff Number 10.7 11.1

    B.Mainstream Smoke

    I. Gas Phase

    Units

    Marijuana

    Tobacco

    Carbon Monoxide % 3.99 4.58
    mg 17.6 20.2
    Carbon Dioxide % 8.27 9.38
    mg 57.3 65.0
    Ammonia mcg 228 199
    HCN mcg 532 498
    Cyanogen (CN)2 mcg 19 20
    Isoprene mcg 83 310
    Acetaldehyde mcg 1200 980
    Acetone mcg 443 578
    Acrolein mcg 92 85
    Acetonitrilebenzene mcg 132 123
    Benzene mcg 76 67
    Toluene mcg 112 108
    Vinyl chloride ng 5.4 12.4
    Dimethylnitrosamine ng 75 84
    Methylethylnitrosamine ng 27 30
    pH, third puff 6.56 6.14
    fifth puff 6.57 6.15
    seventh puff 6.58 6.14
    ninth puff 6.56 6.10
    tenth puff 6.58 6.02

    II. Particulate phase

    Units

    Marijuana

    Tobacco

    Tl particulate – dry mg 22.7 39.0
    Phenol mcg 76.8 138.5
    o-Cresol mcg 17.9 24
    m- and p-Cresol mcg 54.4 65
    Dimethylphenol mcg 6.8 14.4
    Catechol mcg 188 328
    Cannabidiol mcg 190
    D9 THC mcg 820
    Cannabinol mcg 400
    Nicotine mcg 2850
    N-Nitrosonornicotine ng 390
    Naphthalene mcg 3.0 1.2
    1-Methylnaphthalene mcg 6.1 3.65
    2-Methylnaphthalese mcg 3.6 1.4
    Benz(a)anthracene ng 75 43
    Benzo(a)pyrene ng 31 21.1

    https://erowid.org/plants/cannabis/cannabis_info3.shtml

    • harleyrider1978 says:

      Denver to Vote on Social Marijuana Use

      By Mike Adams September 06, 2016

      Denver voters will decide this November whether marijuana consumption should be allowed in bars and restaurants.

      Just days after the rejection of a competing measure proposed by the Denver chapter of NORML, elections officials announced last week that the issue of social marijuana use would still go before voters this fall.
      http://hightimes.com/news/denver-to-vote-on-social-marijuana-use/

      • harleyrider1978 says:

        Netherlands went thru this and their Nazis said MJ was fine as long as it wasn’t mixed with any tobacco!

        Yet both give off nearly the exact same type smoke 96% water and air!

        Colorado has the indoor smoking ban………….lmao

    • waltc says:

      Very useful, Harley. Tx for the link

  9. harleyrider1978 says:

  10. harleyrider1978 says:
  11. harleyrider1978 says:

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