"Quello che ne ha causato il collasso è stato il calore provocato dagli incendi incontrollati, innescati dal carburante ma alimentati dal contenuto degli edifici, che hanno indebolito l'acciaio delle strutture, il cui rivestimento ignifugo era stato significativamente asportato dagli impatti, provocandone il cedimento.Questo meccanismo è stato analizzato a fondo sia dal National Institute of Standards and Technology (NIST), sia da numerosi altri team ingegneristici indipendenti, anche mediante esperimenti reali e simulazioni computerizzate.Le inchieste tecniche hanno accertato che, al di là delle dichiarazioni dei progettisti, nei documenti progettuali non c'è alcuna indicazione che la struttura fosse stata concepita per resistere a quella combinazione di eventi (Rapporto NIST).Il NIST ha anche sottolineato che in ogni caso, con i sistemi di calcolo disponibili all'epoca in cui furono costruite le Torri Gemelle, era praticamente impossibile tener conto di tutte le variabili connesse all'impatto di un grande aereo carico di carburante e scagliato alla massima velocità."
In realtà il lavoro del NIST è messo in serio dubbio:
"Dr. Quintiere discussed many elements of NIST's investigation that he found problematic. He emphasized, "In every investigation I've taken part in, the key has been to establish a timeline. And the timeline is established by witness accounts, by information from alarm systems, by any video that you might have of the event, and then by calculations. And you try to put all of this together. And if your calculations are consistent with some of these hard facts, then perhaps you can have some comfort in the results of your calculations. I have not seen a timeline placed in the NIST report."
Dr. Quintiere also expressed his frustration at NIST's failure to provide a report on the third skyscraper that collapsed on 9/11, World Trade Center Building 7.
"In my opinion, the WTC investigation by NIST falls short of expectations by not definitively finding cause, by not sufficiently linking recommendations of specificity to cause, by not fully invoking all of their authority to seek facts in the investigation, and by the guidance of government lawyers to deter rather than develop fact finding.
"I have over 35 years of fire research in my experience. I worked in the fire program at NIST for 19 years, leaving as a division chief. I have been at the University of Maryland since. I am a founding member and past-Chair of the International Association for Fire Safety Science-the principal world forum for fire research. ..."
NIST Admits Total Collapse Of Twin Towers Unexplainable:
"Despite NIST's theory being even more incredible than its predecessors(with spreading "column instability" triggering "global collapse" in an instant) it works better as a mirage because its timelines stop short of the collapses. NIST's Report states that its first objective is to "determine why and how WTC 1 and WTC 2 collapsed." The Report does not fulfill that objective, and hides thatfailure with misleading headings and disproportionate, misapplied technicaldetail. Its authors should admit that they have failed to explain why and howthe Towers collapsed, and should call for an investigation that will address"
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