We are presently trying to debunk a conspiricy theory. Some claim, ridiculously, that 911 must have been a controlled demolition because of the way the Twin towers collapsed on their own footprint. They also claimed the Salomon building (WT7) which was steel framed could not have collapsed just from a fire in its lower floors. Please could you give your professional opinion so we can put an end to this nonsense once and for all.

This is a typical post on the subject on WT7 :



Posted 04-03-07 21:46 Hide Post
Read the FEMA report on WTC7.The three main trusses were monumentally strong, nothing like the trusses in the twin towers. The fact is either truss 1 or truss 2 failed because of a carbon fire, yes diesel is a carbon fire. The kink in the building occurred directly above truss 1 or 2. The external damage was not even significant. To get the generators up to the 7th floor the outer walls were removed and a crane on the roof lifted them into place. Massive amounts of safety allowances were put into this building for that reason.The strength came from the miles of cantilevered skeleton welded and bolted with 1” bolts using the best steel available. Fire did not envelope the whole building but mostly floor 8 directly above the main trusses and strongest part of the building floors 5 to 7.Each floor was sealed from the next by putting thermal insulating in all gaps. All the fuel tanks were fully thermally insulated; all the steel was also fully thermally insulated.
FEMA, s analysis surmised that diesel fires acted directly on the trusses which may have had improper heat protection applied to them, which might have caused them to fail. The fuel pipes might have been damaged by impact and there might have been enough heat to ignite the fuel. The diesel generators might have gone online but they might not of. The diesel tanks might have lost 200 gallons but they might not. Do you get the gist they don’t know why the truss failed and if they don’t know then neither does anybody.5 years on and FEMA and Nist still have not explained why truss 1 or truss 2 failed and the reason is there is no explanation.Not a conventional one anyway.

http://www.youtube.com/watch?v=0DoibU5njEM

http://query.nytimes.com/gst/fullpag...=&pagewanted=1

Any help much appreciated.