Quote:
Originally Posted by MediaGuy
The WTC was far from hollow - in fact it was the complete opposite, with one of the most solid core support structures in building history.
The "tube within a tube" description is deceptive at best.
:D
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Compared to other buildings, it was rather hollow. It was the other perimeter and the inner core that supported the building, as opposed to other buildings that have support throughout each floor.
There was physically no support from the inner core to the outer wall:
It's pretty simple: A huge airplane destroyed an entire side of perimeter support across ten floors, damaged the core, and further fire weakened it.
From
wikipedia:
After the planes hit the buildings, but before the buildings collapsed, the cores of both towers consisted of three distinct sections. Above and below the impact floors, the cores consisted of what were essentially two rigid boxes; the steel in these sections was undamaged and had undergone no significant heating. The section between them, however, had sustained significant damage and, though they were not hot enough to melt it, the fires were weakening the structural steel. As a result, the core columns were slowly being crushed, sustaining plastic and creep deformation from the weight of higher floors. As the top section tried to move downward, however, the hat truss redistributed the load to the perimeter columns. Meanwhile, the perimeter columns and floors were also being weakened by the heat of the fires, and as the floors began to sag they pulled the exterior walls inwards.
The building fell because a fucking airplane destroyed a large percentage of the support and the building was unable to support it's own weight.
It's pretty simple. Take out 70 percent of my load bearing walls on one side of my house, the second floor is coming down.