Modern Marvels: World Trade Center Part 5 (HQ)
Interview was recorded on January 1st 2001
Unfortunately Mr. Demartini has been missing since September 11th 2001 as he was in the towers that day.
"The building was designed to have a fully loaded 707 crash into it, that was the largest plane at the time, I believe that the building probably could sustain multiple impacts of jet liners because, this structure is like the mosquito netting on your screen door. This intense grid, and the jet plane is just a pencil, puncturing that screen netting, it really does nothing to the screen netting."
Frank A. Demartini
Manager, WTC Construction & Project Management
Also there is this article from 1993
The Seattle Times
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. "However, back in those days people didn't think about terrorists very much."
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.
Concerned because of a case where an airplane hit the Empire State Building, 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."
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."
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by Frédéric Bastiat