If they didn't survive the impact, why would they still have remained standing? The impact is over once the planes hit.
Well, according to eots' and creativedreams' understanding of reality, "impact" means an event that can last 1 minute, 2 hours, or days.
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no according to NIST if the fire proofing remained intact the building would of remained standing....oh wait a minute...did he mean standing for one sec.. one minute..all of eternity ??..
Right. This PROVES your claim that the towers collapsed from the "impact" as being wrong.
The "impact" caused damage to the towers. The ensuing fires (along with the damage caused by the impact) weakened the towers to a point of collapse.
If it was the impact alone that made the towers collapse, then they would have fallen the instant the towers were struck.
Even Leslie Robertson himself states that the towers survived the impact and he is FAR more educated in the field of structural engineering than you are.