progressive collapse

After linking the NIST WTC7 link http://www.nist.gov/public_affairs/factsheet/wtc_qa_082108.cfm i was answered by the following First of all, how does NIST define progressive collapse. I figure any collapse is a progressive collapse, it just progresses quickly

Ive been doing a little more research into the collapses, and its has become painfully clear that if the sections of the towers above the impact zones fell even one floor as a whole, the amount of dynamic force would be waaaaay too much for the lower floor to hold, leading to a total...

Is this video genuine? Is the sound altered? It is, so far, the only clear sound I have on the collapse of WTC 7. It is, unfortunately, not of the entire collapse. It does not include the initiation. If it is genuine, it might be compared to the Ashleigh Banfield tape to compare the...

On the fourth of october 1992, shortly after taking off from Schipol, an El Al 747 cargo plane crashed into an Amsterdam apartment block causing immense damage, and collapsing the middle section of the building. Last week I noticed a troofer on a yahoo forum mention this crash, and claimed that...

New forum member stundie has made a post in the Christophera conctrete core thread. As it isn't very much related to that thread, here the main substance of his post: The full post is here but if you read it, I suggest we forgive him his belligerant tone and give him a chance to present a...

FEMA - "The buildings structural system, composed of the exterior loadbearing frame, the gravity loadbearing frame at the central core, and the system of of deep outrigger trusses in the upper stories, was highly redundant." FEMA - "The exact extent of this damage (to the structures after...