These buildings were not made like other buildings. and designed to take a hit from a 707. No internal columns, but rather a central core.
Underwriter labs designed a section of structure just like the towers and found the fire would NOT have cause failure.
Yes they have calculated the time for free fall of the WTC buildings. 9.2 seconds.
Newtons Laws of motion Time(Squared)=Distance x 2)/ gravity
85.7375 =2724/32
9.2 second
The building fell in approx 10 seconds.
Molten metal was found under the rubble and temps around 2600 degrees and it is known as the longest burning structural fire in history. The jet fuel open air burning temperatures are 260-315 °C (500-599 °F)
Also if you would have had a failure in one area of the building, with what we know about steel and the way it behaves, the failure of the steel would continue in the one area and we would have had an asymmetrical collapse with possibly the top of the building falling away from the tower.
Several secondary explosions were reported by eye witnesses before the collapse. Also the secondary explosions were reported on the news of the day.
Feb 23 1991 a 38 floor skyscraper in Philly burned for 18 hours across 8 floors and described and as the most significant fire of the century. Did not collapse
Oct 17th 2004 56 story skyscraper on Venezuela built in 1976 burned for over 17 hours and spread across 27 floors did not collapse.
Feb 13th 1975 a fire engulfed the 9th- 11th floor and the fire was so intense it lead to the instillation of sprinkler systems. There was another fire that was intense and the fire didn't collapse the towers.
Building 7 a 47 story building. housed Department Of Defense, Securities and exchange commission, IRS, CIA's largest station outside of Washington DC, and the Secret Services biggest field office. Numerous cases would be closed due to its destruction. The 23 floor was bullet proof and bomb resistant, had its own oxygen and power plant.
Hours before the before the 9-11 the alarms were placed in test status. It was being reported the building collapsed 6 mins prior to its collapse. One reporter reported it had collapsed with the same building standing in the background of the report. This building also fell into its own footprint. The fires of this building were not that great to cause failure of all 81 columns, 24 core and 57 perimeter. In order for the building to fall symmetrically, like it did, all columns had to fail at the same time. The bottom floors went first and you seen the rest collapse in on itself. Interestingly so the government was on reported they could not find 1.6 or so trillion dollars. Those records were in WTC building 7.
Building 3 was split in half by falling debris at the base of WTC and it was still standing even though severely damaged.
Building 5 and 6 both had structural damage even with a several damaged roof on one of the buildings and they did not collapse.
Did those other buildings obey the same fire safety standards as the WTC? In order to compare other buildings to WTC, they have to have similar properties (i.e. amount of mass above the fire zones, construction materials) to properly measure the inconsistency due to the unknown. I know many older buildings used asbestos, which may have been more impact resistant. Some even encased all the trusses and vertical columns in concrete, given the steel a thermal insulation. Even at your 'low' temperatures, the microstructure of steel still changes due to recrystallization because time is also a factor. The reason the heat affected the WTC steel so much was because the insulation was blown off during impact. At the time, the architects had to use light-weight insulation to build the world's tallest skyscrapers. Assuming that calculations have the property units, I hope you understand that the analysts probably neglected drag and vibrational/elastic material effects when they calculated the 9.2 seconds. I expect the calculated time to be less than the actual time because of oversimplification in the calculations. You need FEM software to complete a really accurate simulation. Even with the FEM software, the users have to be aware of computational limits and propagation of errors because the software can generate meaningless values if the user isn't aware. Whoever computed the time probably derived the equation by equating the kinetic energy to the potential energy and solved it for time. It works for something of constant mass, but when the parts of the WTC began collapsing, the falling masses increased as it fell on subsequent floors (mass was not constant), so calculus, instead of simple algebra, is required. Also, the temperature of combustion of any fuel is dependent on fuel-air ratio and homogeneous the mixture was. The fuel-air mixture would have been more homogeneous than heterogeneous, so the the temperatures would be very high. Then, I recently learned that 'jet fuel' may be a misnomer for aviation gas. Jet fighters operate at higher elevations and need heavier, less volatile fuels for the turbines to operate efficiently at low pressure. Commercial airlines fly at lower elevations and since they are civilian aircraft, require less complicated turbines (analogous to racing car compared to a pick up truck).
Again, I don't know enough about Building 7 to make an argument.
Sig, as a general rule 25 y/o do not pay attention to the world. Most people pay their attention to sports to dang much. I was gun ho like him in not believing the conspiracy theories. Till I started listening to the other side and I concluded things are possible. Auto correct on the kindle fire at work.
Call me crazy if you want. No worries most people do. I will continue to share the info and let people judge for themselves. Although bashing someone and then picking on their yard is a little childish. Going back to the age being an issue. And most times age does equal intelligence and wisdom.
The government has already been caught previously in false flag operations and backing government overthrows in other countries. Heck Bin Laden was on CIA payroll in the beginning. Along with Atta and other supposed hijackers.
Oh I forgot to mention the "plane" that hit the pentigon.....Hit the only wall that was reinforced to take a missile hit. The pilot also had to perform a flight maneuver that would have been difficult for even the most experienced pilots to perform. Why is it they did not find a single engine part? Why is it that everything was lost in all 4 of the plane crashes, but they were able to recover drivers licenses and other paper and fabric items.
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It also shows Moto's immaturity when I post Nepenthes pictures, he focuses on the lawn int he background and talks smack about it. That is not a sign of maturity. Considering I have recently cleared the land by hand and have not planted grass seed yet because it is still heavy shade. So instead of commenting about the subjects of the pics, he talks trash about a lawn that is a work in progress.
The engine parts would have been there, but I don't think they ever took the time to analyze the materials, with people being so fearful of another attack, most resources were directed at learning how to prevent it instead of analyzing the wreckage for titanium parts vs other light weight alloys. As far as I know, only the WTC has been studied thoroughly.
P.S. The WTC was designed to withstand 707 just like the Titanic was designed to be unsinkable. The engineers probably didn't know much about materials science/metallurgy. I'm quite surprised that you even believed that it really would withstand a 707, considering that the building was never tested with a 707.