I said:1319625000/2000 = 659,812.5 tons
more than 300,000 tons of concrete per building
There were two buildings.
What is the problem?
http://911research.wtc7.net/mirrors/guardian2/wtc/eng-news-record.htmThe largest contract for fabrication of structural steel is held by Pacific Car and Foundry Co., of Seattle. It is $21.79 million for 55,000 tons of steel for the towers' bearing wall panels from the ninth floor up.
In all there are 5,828 of these panels, each about 10 ft wide, 36 ft high, with the heaviest individual panel weighing about 22 tons. Each panel consists of three box columns, 14 in. square, made up of plate up to 3 in. thick and, connected by 54-in, deep spandrels.
The average weight of the panels:
55,000 ÷ 5,828 = 9.44 tons
But the heaviest panels were 22 tons so there were plenty panels weighing less than 9 tons. I have seen posters mention 4 ton and 6 ton panels but no source with any authority.
But it is totally ridiculous that we have not been told the weights and quantities of each variation. That would tell us the distribution of weight for the perimeter upwards from the 9th floor.
My model has the WTC collapsing once a floor is loaded past 30,000,000 pounds, and it can't stop until the ground. My model is simple, and has the collapse time of 12.08 seconds. I can almost do my model in my head, I needed excel for the collapse time.
The FLOORS you keep talking about were outside the core. Didn't the core above impact zone have to come down on the intact core below? So the weight of the upper core wasn't on the floors.
The standard 84 "floors" were about 750 tons.
NIST NCSTAR 1-1A PDF p47
(205.67 * 205.67) - (85.67 * 135.67) = 30677.3 sq ft
Concrete Slab 36.5 psf 559.86 tons
rebar in slab 1.5 psf 23.01 tons
steel deck 2.0 psf 30.68 tons
Struct Steel 10.0 psf 153.39 tons
Total 50.0 psf 766.94
84 Levels with standard floor slabs
10 thru 24 = 15
26 thru 40 = 15
45 thru 58 = 14
60 thru 66 = 7
68 thru 74 = 7
79 thru 91 = 12
93 thru 106 = 14
There were 19 panels on each side of the tower and 4 corner panels that should have weighed about as much as two panels. But the panels were 3 stories tall.
So 22 ton panels would be:
22 * ((4 * 19)+2) / 3 = 572 tons
but 4 ton panels would be:
4 * ((4 * 19)+2) / 3 = 104 tons
So the perimeter at the 9th floor weighed 75% as much as the floor assembly. But that would be 5.5 times as much as the weight of the perimeter at the 109th floor.
But the weight of the core on each level should be even greater than the perimeter. The core had concrete slabs and plumbing and electrical with equipment for elevators.
Kat Dorman, also known as One White Eye, computed the collapse time based on equal masses being slowed down by nothing but the Conservation of Momentum. He got 11.5 seconds. But that presumes no energy being lost breaking connections which would slow things down thereby increasing the time. How could the floors remain perfectly parallel to the ground? If they tilt there will be more friction slowing things down further.
Perfection only happens in math and thought experiments. Reality is much more messy.