Office buildings are not made to kill the people inside in case there is a fire.
These buildings were made to be hit by large aircraft......
"Saturday, February 27, 1993
Twin Towers Engineered To Withstand Jet Collision
"We looked at every possible thing we could think of that could happen to the buildings, even to the extent of an airplane hitting the side," said John Skilling, head structural engineer."
"Skilling, based in Seattle, is among the world's top structural engineers. He is responsible for much of Seattle's downtown skyline and for several of the world's tallest structures, including the Trade Center."
"Skilling's people did an analysis that showed the towers would withstand the impact of a Boeing 707."
"Our analysis indicated the biggest problem would be the fact that all the fuel (from the airplane) would dump into the building. There would be a horrendous fire. A lot of people would be killed," he said. "The building structure would still be there."
"However," he added, "I'm not saying that properly applied explosives - shaped explosives - of that magnitude could not do a tremendous amount of damage."
Although Skilling is not an explosives expert, he says there are people who do know enough about building demolition to bring a structure like the Trade Center down.
"I would imagine that if you took the top expert in that type of work and gave him the assignment of bringing these buildings down with explosives, I would bet that he could do it."
http://community.seattletimes.nwsource.com/archive/?date=19930227&slug=1687698Skilling was the lead designer and strongly implies in this quote that the fires were analyzed, when conducting the building study.
Skilling:
"Our analysis indicated the biggest problem would be the fact that all the fuel (from the airplane) would dump into the building. There would be a horrendous fire. A lot of people would be killed," he said. "The building structure would still be there."
http://community.seattletimes.nwsource.com/archive/?date=19930227&slug=1687698The Port Authority released a white paper in 1964 referencing the analysis done on the structure of the WTC.
"Salient points with regard to the structural design of The World Trade Center Towers" was the low-key title on the white paper in the Port Authority's files. Below the title were eleven numbered points on the structure, beginning with ..
1. The structural analysis carried out by the firm of Worthington Skilling Helle & Jackson is the most complete and detailed of any ever made for any building structure. The preliminary calculations alone cover 1,200 pages and involve over 100 detailed drawings." At the end of the three page document was the notation "MPL:fg" above the date "2-3-64" meaning that the white paper had been typed for Malcom P. Levy by his secretary, Florence Grainger, on February 3, 1964.
...halfway down the first page, the paper contained this astonishing statement:
"3. The buildings have been investigated and found to be safe in an assumed collision with a large jet airliner (Boeing 707-DC 8)traveling 600 miles per hour. Analysis indicates that such collision would result in only local damage to the building and would not cause collapse or substantial damage to the building and would not endanger the lives and safety of occupants not in the immediate area of impact." page 131
http://www.amazon.com/City-Sky-World-Trade-Center/dp/0805074287The buildings were made to withstand plane impacts, and a detailed study was done, explaining why.......
1. The structural analysis carried out by the firm of Worthington Skilling Helle & Jackson is the most complete and detailed of any ever made for any building structure. The preliminary calculations alone cover 1,200 pages and involve over 100 detailed drawings."
http://www.amazon.com/City-Sky-World-Trade-Center/dp/0805074287So what does NIST say about this study?.....
"However, NIST investigators were unable to locate any documentation of the criteria and method used in the impact analysis and, therefore, were unable to verify the assertion that “… such collision would result in only local damage which could not cause collapse or substantial damage to the building.…”
http://wtc.nist.gov/pubs/factsheets/faqs_8_2006.htm