It is a catchy tune, but wasn't the music I was referring to. Granted, I was never expecting you to comprehend the message anyway.
Of course you do, and that is exactly what the people who rigged the buildings to come down expect you to do.
That doesn't even come close to explaining what happened, which is why neither the official "investigations" nor anyone has produced any semblance of experimental confirmation to support such notions, nor will anyone ever do so. Seriously, you might as well be defending theories of psychic spoon bending for all the demonstration of reproducibility you ever could have to support your beliefs.
Viscoelastic (VE) dampers are dependent on both relative velocity and displacement to dissipate energy. VE damping system in Twin Towers is a double-layer shear damper using a 3M material, which is a rubber derivative, glued to steel plate and angle irons. This material will carry some load (which is temperature-dependent and would be less than the two-bolt connection as shown) as it displaces. As installed it has several functions:
1. It develops continuity moment at the end of joist girder, that is, the joist girders will behave as partial continuous members under Dead and Live load. It is partially restrained under Wind load.
2. It restrained the lower chord of the joist girder (in the direction perpendicular to the plane of the joist). Therefore it stabilizes the concrete diaphragm. Note that for a 4-inch thick concrete slab spanning 60 feet, it would buckle if there were no joist girder. It also transfers compression load through bottom chord.
3. Joist girder-column connection is a moment connection.
4. It reduces the energy to be absorbed by the joist girder and the columns under Wind load.
As the temperature rises, 3M materials would loose its load carrying capacity, i.e. its energy-dissipating capacity. This is equivalent as loosing the two-bolt connection because it will act as though there is gaps between the steel plate and the angle irons. As a result, several things would occur:
1. The joist girder is no longer a continuous member. Therefore, even under Dead and Live load, its top chord would rotate more relatively to its supporting column.
2. All the compression or tension force to the diaphragm would go through the top chords only.
3. More rotation between the top chord and its respective column under Wind load.
4. No more lateral restraint for the bottom chord and the joist girder could buckle laterally and the slab diaphragm would follow.
And the result is a tremendous demand on the connection between the top chord and its supporting column.
Let be clear that the VE damping system is a novelty design. First of its kind in the World. First of its kind implemented in a skyscraper. The reason I still think it is a design flaw is that:
In the 60’s and beginning 70’s there are many literatures about plastic design in steel including ASCE manual No 41. From J Heyman to Beedle, they all emphasize the importance of collapse mechanism in Limit Analysis. And in dealing with inelastic behavior such as VE damping system is engaging in Limit Analysis whether you want it or not because you have to think what will happen beyond the device limit.
In this paper, the features of energy-absorbing capacities of the viscoelastic damper and its effect on the structure during earthquakes are investigated. To clarify the behavior of the structure with added viscoelastic dampers, a new analytical model for the viscoelastic damper taking into consideration the earthquakelike loading and the temperature effect, in good agreement with experimental results, and an advanced finite element formulation for the viscoelastic damper are developed. The proposed method could be implemented easily in the finite element program. In this study the behavior of a 10-story building equipped with viscoelastic dampers is examined while it is subjected to earthquake ground motions. Both analytical and experimental results show that the energy-absorbing capacity of the viscoelastic damper decreases with increasing the ambient temperature. Numerical examples show that the responses, including displacements and stresses, of the high-rise building to earthquake loadings are significantly reduced while viscoelastic dampers are added to it.
n the end, they designed the towers so they could sway about 3 feet in either direction. To minimize the sway sensation, they installed about 10,000 visco-elastic dampers between support columns and floor trusses throughout the building. The special visco-elastic material in these dampers could move somewhat, but it would snap back to its original shape. In other words, it could give a little and then return to its initial position, absorbing much of the shock of the building's swaying motion.
While the imagery in the video can reasonably be described as nihilistic, that isn't what I was referring to either.Myself, I tend to avoid exposing myself to stuttering copies of stuff that was done way back when Nosferatu came out, way before I was born. I have too many real images of dead, wounded and mass graves already floating around in my memory. Your nihilistic video references just can't compare.
Back at you.Sigh.
That doesn't even come close to explaining what happened, which is why neither the official "investigations" nor anyone has produced any semblance of experimental confirmation to support such notions, nor will anyone ever do so. Seriously, you might as well be defending theories of psychic spoon bending for all the demonstration of reproducibility you ever could have to support your beliefs.
LOL! QFT. It is all just a bit of amusing time wastingYou're a truther. End of story.
Why are the rest of you wasting your time with this nut job? He will *never* believe a word you write, nor will any sane person reading this thread believe a word he writes.
Yep, as is a majority of the world. You on the other hand are falser, clinging to a crackpot conspiracy theory which has more holes in it than than a block of Swiss cheese.You're a truther.
You're a truther. End of story.
Why are the rest of you wasting your time with this nut job? He will *never* believe a word you write, nor will any sane person reading this thread believe a word he writes.
Let me make one comment about the last two or three pages of this thread, which have amounted to, IMHO, I furious assault by various pro Israeli fan clubbers to totally justify the Israeli position on what amounts to a USA dominated forum. Over matched against that on this forum are those few voices within the USA wilderness screaming bullshit. Why should I be surprised that I am on the losing popular side of that argument in a USA pro-Israeli forum of the great unwashed mean? All us voices of anti-Israeli wisdom are going is casting unwanted pearls of wisdom before self convinced swine. The surest way to get nowhere fast.
But there are two other far more important jokers in the deck, not only the USA POTUS who sets policy and the far more important far larger international community that the USA is only 5% a part of.
And when that 95% international community is really PO'd about Israel, you damn pro Israeli fan clubbers should realize, you are better off realizing that you should be peeing your own pants rather than spouting more bullshit.
Says the guy who thinks suicide bombers are civilized.Let me make one comment about the last two or three pages of this thread, which have amounted to, IMHO, I furious assault by various pro Israeli fan clubbers to totally justify the Israeli position on what amounts to a USA dominated forum. Over matched against that on this forum are those few voices within the USA wilderness screaming bullshit. Why should I be surprised that I am on the losing popular side of that argument in a USA pro-Israeli forum of the great unwashed mean? All us voices of anti-Israeli wisdom are going is casting unwanted pearls of wisdom before self convinced swine. The surest way to get nowhere fast.
But there are two other far more important jokers in the deck, not only the USA POTUS who sets policy and the far more important far larger international community that the USA is only 5% a part of.
And when that 95% international community is really PO'd about Israel, you damn pro Israeli fan clubbers should realize, you are better off realizing that you should be peeing your own pants rather than spouting more bullshit.
..utterly fails to address the physics of how the buildings came down, because you are unwilling to see beyond your own eyes and hence turn to psychological projection.I have tried to let him see beyond his eyes. But the ufo metaphor...
..utterly fails to address the physics of how the buildings came down, because you are unwilling to see beyond your own eyes and hence turn to psychological projection.
I recommend this presentation.
You see what you want to see, and spout nonsense to defend it.All i see are people who wanted 15 minutes of fame.
You see what you want to see, and spout nonsense to defend it.
That much is true, but you still get it wrong. Granted, most school children understand the difference between "where" and "were", while you constantly use the former in place of the latter.Every thing that was happening can be explained with simple physics from children school.
That much is true, but you still get it wrong. Granted, most school children understand the difference between "where" and "were", while you constantly use the former in place of the latter.
Portland cement, the fundamental ingredient in concrete, is a calcium silicate cement made with a combination of calcium, silicon, aluminum, and iron. Producing a cement that meets specific chemical and physical specifications requires careful control of the manufacturing process. The first step in the portland cement manufacturing process is obtaining raw materials. Generally, raw materials consisting of combinations of limestone, shells or chalk, and shale, clay, sand, or iron ore are mined from a quarry near the plant. At the quarry, the raw materials are reduced by primary and secondary crushers. Stone is first reduced to 5-inch size (125-mm), then to 3/4-inch(19 mm). Once the raw materials arrive at the cement plant, the materials are proportioned to create a cement with a specific chemical composition. Two different methods, dry and wet, are used to manufacture portland cement. In the dry process, dry raw materials are proportioned, ground to a powder, blended together and fed to the kiln in a dry state. In the wet process, a slurry is formed by adding water to the properly proportioned raw materials. The grinding and blending operations are then completed with the materials in slurry form. After blending, the mixture of raw materials is fed into the upper end of a tilted rotating, cylindrical kiln. The mixture passes through the kiln at a rate controlled by the slope and rotational speed of the kiln. Burning fuel consisting of powdered coal or natural gas is forced into the lower end of the kiln. Inside the kiln, raw materials reach temperatures of 2600 degrees F to 3000 degrees F (1430 degrees C to 1650 degrees C). At 2700 degrees F (1480 degrees C), a series of chemical reactions cause the materials to fuse and create cement clinker-grayish-black pellets, often the size of marbles. Clinker is discharged red-hot from the lower end of the kiln and transferred to various types of coolers to lower the clinker to handling temperatures. Cooled clinker is combined with gypsum and ground into a fine gray powder. The clinker is ground so fine that nearly all of it passes through a No. 200 mesh (75 micron) sieve. This fine gray powder is portland cement.
It's not a typing error when you do it constantly, but rather an egregious example of mental deficiency.You are left with confronting me with typing errors.
Where?And talking of free falling, if there where...
That much is true, but you still get it wrong. Granted, most school children understand the difference between "where" and "were", while you constantly use the former in place of the latter.
Rather, he can't be expected to understand physics when he demonstrates such flagrant ignorance of basic grammar, and particularly when he continues making the same flagrant grammatical mistake even after having it pointed out to him.