reply to post by Joey Canoli
How much was due to explosives?
I'd say most of it... Concrete does not readily vaporise, even when smashed between heavy objects.... it just fractures.
fairly obvious, but I wanted to see if you have a number on explosive charges, how big they were, etc...
No, I do not... but I could make estimates based on what would probably be necessary, and I believe that earlier in this thread I calculated it as
somewhere near 17 metric tons.
I'll check on that.
I'm waiting.
It's not all that hard to do the calc.
Ya, but you kept responding, so I couldn't *DO* it.
I finally finished the calculations, and I actually came up with less than you did....
This is for the FLOORS ONLY: (Exterior spaces, and Central Column Area)
Floor: 1 acre (4,046.85642 square meters)
Core: 1,107 square meters
Total Floor area (minus core area): 2,939 square meters. (29,390,000 square centimeters)
Floor Thickness: 10 cm
Floor Volume: 293,900,000 cubic centimeters (293.9 cubic meters)
1750–2400 kg/m3
514,325 kg - 705,360 kg
1750kg
56,575,750 kg (110 floors)
113,151,500 kg (220 floors)
2400kg
77,589,600 kg (110 floors)
155,179,200 kg (220 floors)
Core Area: 11,070,000 square centimeters
Core Floor Thickness: 10 cm
Core Floor Volume: 110,700,000 cubic centimeters (110.7 cubic meters)
1750-2400 kg/m3
193,725 kg - 265,680 kg
1750kg/m3
21,309,750 kg (110 floors)
42,619,500 kg (220 floors)
2400kg/m3
29,224,800 kg (110 floors)
58,449,600 kg (220 floors)
Totals; *One Tower*:
All 1750: 77,885,500 kg (85,854.0676 short tons)
Inner 2400, outer 1750: 85,800,550 kg (94,578.9167 short tons)
All 2400: 106,814,400 kg (117,742.721 short tons)
I'm not entirely sure how I came up with less than you did... I suspect that I didn't do the thickness right or something...
Anyway, this is merely a back of the envelope calculation, and I do not believe that it actually represents the REAL amount of concrete in each
building.
Furthermore, the Amount of Structural Steel used in the ENTIRE COMPLEX was 200,000 tons... which evenly divided between each building ALONE, would
give us a ratio of 50% concrete, and 50% steel....
Which we know is not the case, as ALOT of the steel was used on the other buildings in the Complex.
So, considering the height of the other buildings, I would be willing to go so far as to say at least 80% of the 200,000 tons of steel was in the Two
Towers ALONE....
Leaving us with 160,000 tons of steel for both towers, or 80,000 tons of steel per tower.
So, that puts the concrete as heavier than the steel in the tower....
However, that still leaves at least half of the mass of the tower unaccounted for.... and I absolutely refuse to believe that Gypsum and fireproofing
weighs as much as the tower itself.
So, I'm thinking Ducting, Machinery, Elevators, etc.... although actually adding all of that up would be tedious, and darn near impossible.