WTC7 Fires

Please excuse the shoddy animation of this .gif, but I'm at work and all I have is ImageReady to be able to animate these pictures.



I'm not sure of the entire story of WTC7, so maybe someone can explain this to me. The North and South towers collapsed because the jet fuel from the planes burned long enough to weaken the steel and it buckled under the pressure.

After their collapse, debris from the towers drifted to WTC7 and it caught fire. I'm sure I don't have all the pictures of the entire fire in this animation, but certainly, these are the fires that eventaully caused the collapse. These fires had no excess fuel feeding them. Just your normal everyday fires from the looks of them. It's possible that some sort of fuel soaked items (desk, wall, etc.) flew into the building and that item fed the fires of WTC7 for a bit.

Weren't steel buildings designed to be sturdier than concrete & brick buildings? Don't concrete & brick apartment building burn all the time? Have there been any documented collapses of those buildings?

The point of this thread is to get information on how a building such as this was weakened to a point of causing the central collapse of the top of this building from the pockets of fires.

I've heard that one side of WTC7 was weakened, gave way and the building collapsed as a result of this. Why then would the central top of the building give way before the lower floors?

I don't get it.