Warrior General Games

Originally posted by baumusc
Peer reviewed explanations on the WTC collapses.

WTC 7:
http://www.structuremag.org/Archives/2007-11/SF-WTC7-Gilsanz-Nov07.pdf

WTC 1, 2:

http://www-math.mit.edu/~bazant/WTC/WTC-asce.pdf

http://www.csicop.org/si/show/the_9_11_truth_movement_the_top_conspiracy_theory_a_decade_later

http://www.jod911.com/WTC%20COLLAPSE%20STUDY%20BBlanchard%208-8-06.pdf



Brannigan, F.L.
"WTC: Lightweight Steel and High-Rise Buildings"
Fire Engineering v.155, no. 4, (2002): 145-150.

Clifton, Charles G.
Elaboration on Aspects of the Postulated Collapse of the World Trade Centre Twin Towers
HERA: Innovation in Metals. 2001. 13 December 2001.

"Construction and Collapse Factors"
Fire Engineering v.155, no. 10, (2002): 106-108.

Corbett, G.P.
"Learning and Applying the Lessons of the WTC Disaster"
Fire Engineering v.155, no. 10, (2002.): 133-135.

"Dissecting the Collapses"
Civil Engineering ASCE v. 72, no. 5, (2002): 36-46.

Eagar, T.W., & Musso, C.
"Why Did the World Trade Center Collapse? Science, Engineering, and Speculation"
JOM v. 53, no. 12, (2001): 8-12.

Federal Emergency Management Agency, Therese McAllister, report editor.
World Trade Center Building Performance Study: Data Collection, Preliminary Observations, and Recommendations
(also available on-line)

Gabrielson, T.B., Poese, M.E., & Atchley, A.A.
"Acoustic and Vibration Background Noise in the Collapsed Structure of the World Trade Center"
The Journal of Acoustical Society of America v. 113, no. 1, (2003): 45-48.

"Collapse Lessons"
Fire Engineering v. 155, no. 10, (2002): 97-103

Marechaux, T.G.
"TMS Hot Topic Symposium Examines WTC Collapse and Building Engineering"
JOM, v. 54, no. 4, (2002): 13-17.

Monahan, B.
"World Trade Center Collapse-Civil Engineering Considerations"
Practice Periodical on Structural Design and Construction v. 7, no. 3, (2002): 134-135.

Newland, D.E., & Cebon, D.
"Could the World Trade Center Have Been Modified to Prevent Its Collapse?"
Journal of Engineering Mechanics v. 128, no. 7, (2002):795-800.

National Instititue of Stamdards and Technology: Congressional and Legislative Affairs
“Learning from 9/11: Understanding the Collapse of the World Trade Center”
Statement of Dr. Arden L. Bement, Jr., before Committee of Science House of Representatives, United States Congress on March 6, 2002.

Pinsker, Lisa, M.
"Applying Geology at the World Trade Center Site"
Geotimes v. 46, no. 11, (2001).
The print copy has 3-D images.

Public Broadcasting Station (PBS)
Why the Towers Fell: A Companion Website to the Television Documentary.
NOVA (Science Programming On Air and Online)

Post, N.M.
"No Code Changes Recommended in World Trade Center Report"
ENR v. 248, no. 14, (2002): 14.

Post, N.M.
"Study Absolves Twin Tower Trusses, Fireproofing"
ENR v. 249, no. 19, (2002): 12-14.

The University of Sydney, Department of Civil Engineering
World Trade Center - Some Engineering Aspects
A resource site.

"WTC Engineers Credit Design in Saving Thousands of Lives"
ENR v. 247, no. 16, (2001): 12.


You really have to stop using Bazant... he was discredited long ago! Unless you still believe the discredited pancake theory of collapse

Originally posted by Homage


I get that you don''t know anything about physics. It's OK to be ignorant. Embrace it

Originally posted by wormser1971
I get that you don''t know anything about physics. It's OK to be ignorant. Embrace it

It's not our fault you don't understand that if something is going to fail under static loading... that it's pointless to even check if it's going to fail under both static and dynamic loading simultaneously.

From the Demolition World study on the WTC collapse:

ASSERTION #2
“But they fell straight down into their own footprint.”

PROTEC COMMENT:
They did not. They followed the path of least resistance,
and there was a lot of resistance.
Any discussion of how the towers fell on 9/11 requires a fundamental understanding of
how buildings collapse and an examination of the damage inflicted upon adjacent
structures that morning.

A tall office building cannot be made to tip over like a tree. Reinforced concrete
smokestacks and industrial towers can, due to their small footprint and inherently
monolithic properties. However, because typical human-inhabited buildings (and their
supporting elements) are spread over a larger area and are not nearly as rigid, the laws
of gravity cause them to begin collapsing downward upon being weakened or tipped off
center to a certain point. Blasters are well aware of this and often rely on this principle in
designing upper-floor charge patterns to maximize breakage and in predicting debris
drop zones.

The collapse of towers 1 and 2 followed this principle exactly. When the impact floors of
both towers eventually failed, the upper sections did not simply tumble over onto the
street below, rather they tilted while simultaneously collapsing downward.

One primary difference between these two collapses and a typical building implosion
was that the initial failures occurred very high up on the structures, which lead to an
extended-duration “pancake” effect down to the ground. With the weight and mass of
the upper sections forcing the floor trusses below rapidly downward, there was no way
for outer perimeter walls to fall in, so they had to fall out. A review of all photographic
images clearly show about 95% of falling debris being forced away from the footprint of
the structure, creating a giant “mushroom” effect around its perimeter.

As we now know, significant amounts of heavy structural debris rained down for blocks
around the site. Many of the closest WTC buildings were completely destroyed and
others heavily damaged. Predictably, the north tower’s collapse caused slightly more
ancillary damage than the south tower, as its impact point was higher and thus a larger
volume of debris was projected farther from its footprint. Video of the north tower
collapse clearly shows a roughly 50-story tall section of the building shearing away intact
and laying out towards the west, heavily damaging the American Express Building and
others on the adjacent block. Aerial photos taken just after both collapses show massive
volumes of debris that impacted WTC 7 (and other buildings to the north), the effects of
which were directly responsible for the intense fires within that structure.

These facts indicate that a relatively small amount of structural support debris actually
landed straight down within the towers’ footprints, making this event notably dissimilar to
a planned demolition event.

Originally posted by wormser1971
Are you ready? Here it is for you ignorant uneducated people unwilling to believe science... Debate this

*
pretend that the entire 3,500 gallons of jet fuel was confined to just one floor of the World Trade Center, that the jet fuel burnt with the perfect quantity of oxygen, that no hot gases left this floor and that no heat escaped this floor by conduction. With these ideal assumptions (none of which were meet in reality) we will calculate the maximum temperature that this one floor could have reached. Of course, on that day, the real temperature rise of any floor due to the burning jet fuel, would have been considerably lower than the rise that we calculate, but this estimate will enable us to demonstrate that the "official" explanation is a lie.

Note that a gallon of jet fuel weighs about 3.1 kilograms, hence 3,500 gallons weighs 3,500 x 3.1 = 10,850 kgs.

Jet fuel is a colorless, combustible, straight run petroleum distillate liquid. Its principal uses are as an ingredient in lamp oils, charcoal starter fluids, jet engine fuels and insecticides.

It is also know as, fuel oil #1, kerosene, range oil, coal oil and aviation fuel.

It is comprised of hydrocarbons with a carbon range of C9 - C17. The hydrocarbons are mainly alkanes CnH2n+2, with n ranging from 9 to 17.

It has a flash point within the range 42° C - 72° C (110° F - 162° F).

And an ignition temperature of 210° C (410° F).

Depending on the supply of oxygen, jet fuel burns by one of three chemical reactions:

(1) CnH2n+2 + (3n+1)/2 O2 => n CO2 + (n + 1) H2O

(2) CnH2n+2 + (2n+1)/2 O2 => n CO + (n + 1) H2O

(3) CnH2n+2 + (n+1)/2 O2 => n C + (n + 1) H2O

Reaction (1) occurs when jet fuel is well mixed with air before being burnt, as for example, in jet engines.

Reactions (2) and (3) occur when a pool of jet fuel burns. When reaction (3) occurs the carbon formed shows up as soot in the flame. This makes the smoke very dark.

In the aircraft crashes at the World Trade Center, the impact (with the aircraft going from 500 or 600 mph to zero) would have throughly mixed the fuel that entered the building with the limited amount of air available within. In fact, it is likely that all the fuel was turned into a flammable mist. However, for sake of argument we will assume that 3,500 gallons of the jet fuel did in fact form a pool fire. This means that it burnt according to reactions (2) and (3). Also note that the flammable mist would have burnt according to reactions (2) and (3), as the quantity of oxygen within the building was quite limited.

Since we do not know the exact quantities of oxygen available to the fire, we will assume that the combustion was perfectly efficient, that is, that the entire quantity of jet fuel burnt via reaction (1), even though we know that this was not so. This generous assumption will give a temperature that we know will be higher than the actual temperature of the fire attributable to the jet fuel.

We need to know that the (net) calorific value of jet fuel when burnt via reaction (1) is 42-44 MJ/kg. The calorific value of a fuel is the amount of energy released when the fuel is burnt. We will use the higher value of 44 MJ/kg as this will lead to a higher maximum temperature than the lower value of 42 (and we wish to continue being outrageously generous in our assumptions).

For a cleaner presentation and simpler calculations we will also assume that our hydrocarbons are of the form CnH2n. The dropping of the 2 hydrogen atoms does not make much difference to the final result and the interested reader can easily recalculate the figures for a slightly more accurate result. So we are now assuming the equation:

(4) CnH2n + 3n/2 O2 => n CO2 + n H2O

However, this model, does not take into account that the reaction is proceeding in air, which is only partly oxygen.

Dry air is 79% nitrogen and 21% oxygen (by volume). Normal air has a moisture content from 0 to 4%. We will include the water vapor and the other minor atmospheric gases with the nitrogen.

So the ratio of the main atmospheric gases, oxygen and nitrogen, is 1 : 3.76. In molar terms:

Air = O2 + 3.76 N2.

Because oxygen comes mixed with nitrogen, we have to include it in the equations. Even though it does not react, it is "along for the ride" and will absorb heat, affecting the overall heat balance. Thus we need to use the equation:

(5) CnH2n + 3n/2(O2 + 3.76 N2) => n CO2 + n H2O + 5.64n N2

From this equation we see that the molar ratio of CnH2n to that of the products is:

CnH2n : CO2 : H2O : N2 = 1 : n : n : 5.64n moles
= 14n : 44n : 18n : 28 x 5.64n kgs
= 1 : 3.14286 : 1.28571 : 11.28 kgs
= 31,000 : 97,429 : 39,857 : 349,680 kgs

In the conversion of moles to kilograms we have assumed the atomic weights of hydrogen, carbon, nitrogen and oxygen are 1, 12, 14 and 16 respectively.

Now each of the towers contained 96,000 (short) tons of steel. That is an average of 96,000/117 = 820 tons per floor. Lets suppose that the bottom floors contained roughly twice the amount of steel of the upper floors (since the lower floors had to carry more weight). So we estimate that the lower floors contained about 1,100 tons of steel and the upper floors about 550 tons = 550 x 907.2 ≈ 500,000 kgs. We will assume that the floors hit by the aircraft contained the lower estimate of 500,000 kgs of steel. This generously underestimates the quantity of steel in these floors, and once again leads to a higher estimate of the maximum temperature.

Each story had a floor slab and a ceiling slab. These slabs were 207 feet wide, 207 feet deep and 4 (in parts 5) inches thick and were constructed from lightweight concrete. So each slab contained 207 x 207 x 1/3 = 14,283 cubic feet of concrete. Now a cubic foot of lightweight concrete weighs about 50kg, hence each slab weighed 714,150 ≈ 700,000 kgs. Together, the floor and ceiling slabs weighed some 1,400,000 kgs.

So, now we take all the ingredients and estimate a maximum temperature to which they could have been heated by 3,500 gallons of jet fuel. We will call this maximum temperature T. Since the calorific value of jet fuel is 44 MJ/kg. We know that 3,500 gallons = 31,000 kgs of jet fuel

will release 10,850 x 44,000,000 = 477,400,000,000 Joules of energy.

This is the total quantity of energy available to heat the ingredients to the temperature T. But what is the temperature T? To find out, we first have to calculate the amount of energy absorbed by each of the ingredients.

That is, we need to calculate the energy needed to raise:

39,857 kilograms of water vapor to the temperature T° C,
97,429 kilograms of carbon dioxide to the temperature T° C,
349,680 kilograms of nitrogen to the temperature T° C,
500,000 kilograms of steel to the temperature T° C,
1,400,000 kilograms of concrete to the temperature T° C.

To calculate the energy needed to heat the above quantities, we need their specific heats. The specific heat of a substance is the amount of energy needed to raise one kilogram of the substance by one degree centigrade.

Substance Specific Heat [J/kg*C]
Nitrogen 1,038
Water Vapor 1,690
Carbon Dioxide 845
Lightweight Concrete 800
Steel 450

Substituting these values into the above, we obtain:

39,857 x 1,690 x (T - 25) Joules are needed to heat the water vapor from 25° to T° C,
97,429 x 845 x (T - 25) Joules are needed to heat the carbon dioxide from 25° to T° C,
349,680 x 1,038 x (T - 25) Joules are needed to heat the nitrogen from 25° to T° C,
500,000 x 450 x (T - 25) Joules are needed to heat the steel from 25° to T° C,
1,400,000 x 800 x (T - 25) Joules are needed to heat the concrete from 25° to T° C.

The assumption that the specific heats are constant over the temperature range 25° - T° C, is a good approximation if T turns out to be relatively small (as it does). For larger values of T this assumption once again leads to a higher maximum temperature (as the specific heat for these substances increases with temperature). We have assumed the initial temperature of the surroundings to be 25° C. The quantity, (T - 25)° C, is the temperature rise.

So the amount of energy needed to raise one floor to the temperature T° C is

= (39,857 x 1,690 + 97,429 x 845 + 349,680 x 1,038 + 500,000 x 450 + 1,400,000 x 800) x (T - 25)
= (67,358,330 + 82,327,505 + 362,967,840 + 225,000,000 + 1,120,000,000) x (T - 25) Joules
= 1,857,653,675 x (T - 25) Joules.

Since the amount of energy available to heat this floor is 477,400,000,000 Joules, we have that

1,857,653,675 x (T - 25) = 477,400,000,000
1,857,653,675 x T - 46,441,341,875 = 477,400,000,000

Therefore T = (477,400,000,000 + 46,441,341,875)/1,857,653,675 = 282° C (540° F).

So, the jet fuel could (at the very most) have only added T - 25 = 282 - 25 = 257° C (495° F) to the temperature of the typical office fire that developed.

Remember, this figure is a huge over-estimate, as (among other things) it assumes that the steel and concrete had an unlimited amount of time to absorb the heat, whereas in reality, the jet fuel fire was all over in one or two minutes, and the energy not absorbed by the concrete and steel within this brief period (that is, almost all of it) would have been vented to the outside world.

"The time to consume the jet fuel can be reasonably computed. At the upper bound, if one assumes that all 10,000 gallons of fuel were evenly spread across a single building floor, it would form a pool that would be consumed by fire in less than 5 minutes"

Quote from the FEMA report into the collapse of WTC's One and Two (Chapter Two).

Here are statements from three eye-witnesses that provide evidence that the heating due to the jet fuel was indeed minimal.

Donovan Cowan was in an open elevator at the 78th floor sky-lobby (one of the impact floors of the South Tower) when the aircraft hit. He has been quoted as saying: "We went into the elevator. As soon as I hit the button, that's when there was a big boom. We both got knocked down. I remember feeling this intense heat. The doors were still open. The heat lasted for maybe 15 to 20 seconds I guess. Then it stopped."

Stanley Praimnath was on the 81st floor of the South Tower: "The plane impacts. I try to get up and then I realize that I'm covered up to my shoulder in debris. And when I'm digging through under all this rubble, I can see the bottom wing starting to burn, and that wing is wedged 20 feet in my office doorway."

Ling Young was in her 78th floor office: "Only in my area were people alive, and the people alive were from my office. I figured that out later because I sat around in there for 10 or 15 minutes. That's how I got so burned."

Neither Stanley Praimnath nor Donovan Cowan nor Ling Young were cooked by the jet fuel fire. All three survived.



We have assumed that the entire 3,500 gallons of jet fuel was confined to just one floor of the World Trade Center, that the jet fuel burnt with perfect efficency, that no hot gases left this floor, that no heat escaped this floor by conduction and that the steel and concrete had an unlimited amount of time to absorb all the heat.

Then it is impossible that the jet fuel, by itself, raised the temperature of this floor more than 257° C (495° F).

Now this temperature is nowhere near high enough to even begin explaining the World Trade Center Tower collapse.

It is not even close to the first critical temperature of 600° C (1,100° F) where steel loses about half its strength and it is nowhere near the quotes of 1500° C that we constantly read about in our lying media.


and it all of that you forget that there were other things to burn...as well as the fact that a fire gets hotter as it burns things......bodies....desks....shelves. eletrical equips....paper, etc.

Originally posted by baumusc
http://www.csicop.org/uploads/images/si/thomas-figure.png

That was a funny meme

[Originally posted by Jason Cash
and it all of that you forget that there were other things to burn...as well as the fact that a fire gets hotter as it burns things......bodies....desks....shelves. eletrical equips....paper, etc.

And it all of that you forget that the fire burnt within 10 minutes.

Originally posted by issacar
And it all of that you forget that the fire burnt within 10 minutes.

That's not how fires work and that's not what happened

Originally posted by rams78110
That's not how fires work and that's not what happened

ok one tower burnt for 8 minutes and the other for 12.

Also, lol wormser. Even your brainless copypasta says 'the jet fuel could have only added ____', ignoring the other shit that kept burning for the duration of the towers standing.

Originally posted by issacar
ok one tower burnt for 8 minutes and the other for 12.

Ah so the black smoke pouring from the building for the entire rest of the time after the planes hit was from..?

http://upload.wikimedia.org/wikipedia/commons/3/35/WTC_smoking_on_9-11.jpeg

No fire here

http://media.nj.com/salem_impact/photo/world-trade-center-promojpg-cbe2905b836e4bbf.jpg

The fire is clearly out, move along

Originally posted by rams78110
Ah so the black smoke pouring from the building for the entire rest of the time after the planes hit was from..?

Black Smoke = Oxygen starved fire

Originally posted by issacar
ok one tower burnt for 8 minutes and the other for 12.

Wut??? I'm pretty sure I woke up 45 minutes after the attacks started, turned on the TV and saw the buildings still burning out of control.