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Those who insist WTC7 collapsing was a conspiracy still haven't addressed basic engineering questions as to the type of construction, type of steel (loses much of its strength in a fire; bends), type of connections (that matters a lot in regards to WTC7 - see below), etc ...
I asked in a previous post whether it was tube-frame or box-frame construction ... not one response from the so-called demolition experts here ...
So I did a quick search ... and, as I suspected, WTC7 too was tube-frame construction similar to WTC 1 & 2. That makes a huge difference! And easily accounts for the building collapsing, and in the manner it did - mostly within its own footprint.
Tube-frame structures (having few, if any, interior columns other than the core) are far more vulnerable to fire damage than box-frame structures (grid like; multiple columns spread through-out each floor, such as the Empire State Building).
In tube-frame, once the connections of a floor or two (even if only part of) give away, that can begin an unstoppable pancaking effect of floors cascading on to the floors below driven by gravity - think of all the energy that it took to raise all that material - now imagine all that energy being released in seconds - it's no surprise WTC7 too collapsed.
Ron
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