Idiot WTC conspiracies
Mark, you really have no understanding of science or engineering, don't you?
>>>> they stated then that it could survive a Jumbo crashing and exploding into it because of it's revolutionary new design.
I doubt any professional engineer/architect would ever give an unqualified statement that a building could survive an explosion without knowing more about the nature of the explosion: what sort of explosive, how much, where it was detonated, etc, etc. Of course a clueless PR or marketing fuckwit (as if there was any other kind of this pond life) would say that sort of thing. Fortunately they don't get to design buildings or do anything that really matters.
FYI, the force and kinetic energy of a big plane hitting a skyscraper is nothing compared to the force exerted on them by the wind. Think about it. You've probably experienced the force of a light wind on an umbrella. Now imagine how much force would be exerted by a strong wind on the surface area of a skyscraper which would be of the order of thousands of square metres. Each tower barely moved when it was hit by a couple of hundreds of tons of aeroplane going at 500mph. BECAUSE IT WAS DESIGNED TO COPE WITH MUCH GREATER STRUCTURAL LOADS THAN THAT. If the towers hadn't been designed to handle that load/force, they would have fallen over in the same way as you would if someone pushed you.
>>>> The design of the building as a concrete skirt meant that the iron skeleton wasn't structurally *necessary*, though its loss would mean that the buildings were then vulnerable.
This is profoundly stupid and has no basis in fact. Concrete is not a viable material for tall office buildings or apartment blocks. A tower block using concrete for its structural strength would need to have walls many metres thick. Iron's not suitable either, it's too brittle. The only way to construct large buildings is to use a steel structure and then use something like glass or brick for exterior cladding. This cladding carries no structural load. The weight of the building and the things inside it are carried by the steel frame. Which also explains why the steel goes up before anything else when the buildings are constructed.
Oh and the WTC did not have a "concrete skirt". It had a steel frame that had glass panels and concrete cladding. As you can see by studying photos of the towers when they were being constructed. Unless of course there's been a global conspiracy to doctor these in all of the world's picture libraries since the towers collapsed.