Sorry Skateguy but you are just wrong here ...
First of all let's talk about these 47 columns you like to keep banging on about ... WHICH 47 columns ???
Or are you asserting that the
entire tower had ONLY 47 columns running from bedrock to roofline in one continuous length ???
You need to clarify ...
For it is my understanding that there were 47 core columns on EACH floor, 110 floors ... that makes 5170 colums.
So WHICH particular 47 are you talking about ???
The
entire building got its RIGIDITY from its internal floors supporting the external walls ... without that BRACING effect the outer walls would be SUBJECT to wind-load WITHOUT anything to help it resist.
Don't forget also that the TRUSSES which spanned BETWEEN the core and the outside walls HAD to be connected as they TIED the two TOGETHER !!!
The outer walls were NOT designed as free-standing structures like a chimmney stack ... so NO-ONE except a complete moron would think it was the floors that "held up the building".
The floors TIED the two
tubes together !!!
Same for the inner core, it was also NOT designed as a free-standing structure !!!
I think you are being misled by the tube-within-tube description of the Towers and no, the floors were NOT just simply "attached" to the support columns ... they were an INTEGRAL part to the entire load and structure.
Although, they were a tube-within-tube structure, they got RIGIDITY from the bracing of the floors ... and WITHOUT that rigidity and stability from being tied together ... one/other/both could definately fall !!!
So, when the floors began to fail ... there was nothing left for the outer walls to do on those areas except to buckle.
And the inner core had then been RIPPED away from support within itself ... it was designed to take ALMOST the whole buildings gravity load ... so once that load started moving it gotta come down !!!
Also,
where do you get this stuff that those core columns "melted" ... since when has steel had to melt into gloop to fail !!!
As I mentioned before Skateguy ... if you would be prepared to do my little challenge it would be much more instructive and quicker way to have all these answered.
With your previous work contacts perhaps you could seek out relevent professionals and ask them.
Go to your local University or centre of advanced learning, find a professor of engineering or arcitecture (or both) and present your findings and understanding to them ... see if they hold up !!!
Will you do it ... if not why not ???
There is a place to seek the truth ... it is in the form of facts !!!
So you must be able to explain WHY you are not interested in their learned and academic expertise WITHIN the relevent spheres !!!