"Speaking of ignoring things;
Quote:
"The structural system, deriving from the I.B.M. Building in Seattle, is impressively simple ..."
I didn't ignore that, LAK. The IBM Building in Seattle is 20 fricking stories tall, ONE FIFTH the height of the WTC. While the basic concept is the same, the additional 90 stories on the WTC mandated significant changes in the design. You'll notice that I covered that when I said the WTC towers were the first LARGE buildings to employ this type of structure. The IMB Building? Even by the standards of the day it was not a large building.
In many ways, it's like trying to compare a WW II Fletcher Class destroyer made at Bath Iron Works with an Aegis Class destroy made at Bath. Sure, they're similar, but there are HUGE differences.
"... The 208-foot wide facade is, in effect, a prefabricated steel lattice, with columns on 39-inch centers acting as wind bracing to resist all overturning forces; the central core takes only the gravity loads of the building."
Nice try, but that doesn't say what you THINK it says. Yes, I did make a mistake in saying that the interior core gives the lateral resistance -- I knew that wasn't true, but it crept in as I was typing. God forbid that ever happens to anyone else.
However, back to the above... In traditional buildings the central core does it all.
In the WTC, the exterior shell provided not only the lateral resistance, but also took approximately 60 to 80% of the total gravity load of the buildings (at least from some things I've read). The interior core would obviously have to take some of the gravity load simply because you're hollowing out large sections of the interior to provide for elevators, stairwells, and the like.
"No, the central core bore the gravity load of the buildings. The outer lattice was primarily bracing for rigidity - wind bracing."
WRONG.
http://people.howstuffworks.com/wtc2.htm
"The 707-320 was considered the benchmark at the time, and the WTC engineers would perhaps have taken the trouble to get the facts from those who would know at the time."
No, it wouldn't have been a benchmark, the benchmark would be the most numerous type in service. The Intercontinental's fuel capacity was a deviation from the benchmark which largely became obsolete with the advent of new engines.
One could just as easily say that hey, these guys should have been a lot more forward looking and designed for the largest aircraft not at the time, but in 50 or even 100 years, but that's simply ludicrous.
More later...