On 24/09/18 13:59, z9wahqvh wrote:
NIST report page xxxv: "[WTC7] was the first known instance of the total collapse of a tall building primarily due to fires."
Very roughly, in the 50 years since 1968 I have found 38 structurally significant fires in tall buildings. By structurally significant I mean where by my estimation there was significant insult to the structural parts of the building from fire - roughly, a large fire over much of several floors and which lasted uncontrolled for an hour or more, and eg where the fire wasn't mostly on the outside of the building. Please don't regard these lists as in any way complete or authoritative - it was just a quick data grab, back-of-the-envelope stuff. I surely missed out, or got the structural material, insult or outcome wrong, on one or two or more cases due to the rushed nature of the enquiry. Cases, especially from Russia and China, were excluded because data was lacking or censored. I'd guesstimate I included over 50% of all such fires worldwide, with their details about 70% correct. Corrections welcome, though I don't know that I'd do anything with them other than read them. In 8 of these cases the main structural material of the building was steel. These are: First Interstate Tower 1988 steel [1] 1 World Trade Center 2001 steel total collapse 2 World Trade Center 2001 steel total collapse 7 World Trade Center 2001 steel total collapse 90 West Street 2001 steel [2] Beijing TV Cultural Center 2009 steel [3] Plasco Building 2017 steel total collapse Wilton Paes de Almeida 2018 steel total collapse The remaining 30 fires were in reinforced concrete buildings. I have marked some composite buildings where the main load-bearing structure is concrete as rc. Where parts of the building were supported by reinforced concrete and distinct other parts were supported by steel I have marked then rc/steel. Taeyongak Hotel 1971 rc Andraus Building 1972 rc Joelma Building 1974 rc Campbell Shopping Complex 1976 rc partial collapse MGM Grand Hotel 1980 rc Las Vegas Hilton 1981 rc Minneapolis Thanksgiving 1982 rc/steel demolished Dupont Plaza Hotel 1986 rc Peachtree 25th Building 1989 rc One Meridian Plaza 1991 rc/steel demolished UNITIC Twin Towers 1992 rc Sarajevo Executive Council 1992 rc Hotel Olympik 1995 rc Garley building 1996 rc Ušće Tower 1999 rc Parque Central East 2004 rc/steel Windsor Tower 2005 rc/steel partial collapse Hajar Tower 2008 rc/steel Bashundhara City Tower 2009 rc Abraj Al Bait Towers 2009 rc Shanghai fire 2010 rc Dynasty Wanxin 2010 rc Hanoi 2011 rc Federation Tower East 2012 rc Oko Tower 1 2013 rc Grozny-City Towers 2013 rc The Marina Torch 2015 rc Wisma Kosgoro 2015 rc Baku residence building 2015 rc Marco Polo Apartments 2017 rc [1] Fema report: "Unusually good application of fire resistive coating helped maintain structural integrity in fire." [*] [2] Extensive use of terracotta is said to have helped prevent collapse [3] Chinese reticence and/or censorship makes available data uncertain
if you want me to accept the NIST report
I don't want you to accept the NIST report. I don't think I'd accept it myself. But I know very little about WTC7, especially compared to 1+2. -- Peter Fairbrother [*] https://www.webcitation.org/query?url=http%3A%2F%2Fwww.lafire.com%2Ffamous_fires%2F880504_1stInterstateFire%2FFEMA-TecReport%2FFEMA-report.htm&date=2010-07-13