OK, where was I? Oh yeah, "shoddy construction"!
The buildings still stood for 28 years and had to withstand gravity and the wind. The original specs claim that the buildings were supposed to sway 36 inches at the top in a 150 mph wind. Someone told me on some website that the wind had reached 100 mph on 6 occasions during the life of the buildings. I was never able to find that information however.
Ha, I can ask ChatGPT:
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For example:
1. **Hurricane Floyd (1999):** Brought strong winds to New York City, although the exact wind speeds at the height of the Twin Towers are not specifically recorded.
2. **Nor'easters:** These powerful storms, common in the northeastern United States, can produce very high winds, especially at higher elevations like those of the Twin Towers.
3. **Hurricane Gloria (1985):** Another strong storm that passed close enough to New York City to produce high winds.
Engineers designed the Twin Towers to withstand wind speeds of up to 150 mph, anticipating that such conditions might occur during their lifespan.
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The force of the wind applied to the Towers would be greater than that of an airliner, the difference would be one of concentration in a small area. In 1991 tests were conducted with accelerometers at the tops of the towers. I presume that synchronized motion and wind data they could do strength calculations on the towers looking for weaknesses. This was reported in the NCSTAR1 by the NIST but only that it was done. So how does "shoddy construction" construction take that for 28 years. And there was a fire in the 70s and a bomb in '93.
On 9/11 there was a digital camera pointed towards the South Tower catching at the 70th floor. I presume that it was pointed at the top of the North Tower and happened to catch the South Tower at the moment of impact. The building deflected 12 inches at the 70th floor even though the plane impacted at the 81st floor. It should have deflected 14 to 15 inches there. The building then oscillated for four minutes after impact getting progressively smaller exhibiting a behavior known as "damped oscillation". Knowing the mass and velocity of the plane I would think that NIST could have extracted some information about the condition of the building from analyzing the motion. But they did not say anything further about it. This was the motivation for the second video called the Mass Impact Test.
The collapse of the South Tower presents some different issues than the North. It was hit second an yet came down first. It was hit lower down than the North Tower, at level 81 instead of 94. Also the South Tower impact did not go directly into the core. The fuselage of the aircraft scraped the corner of the core and went into the open office area and exploded. That is why so many pictures show a huge fireball outside of the building. This resulted in less damage to the core and an intact stairwell by which a few people who were above the impact zone escaped.
Since the 81st level had to support more weight it should have contained more steel than the impact region of WTC1. That combined with sustaining less damage due to the airliner trajectory, how can the earlier collapse of WTC2 be explained? More steel should have taken longer to heat up to the point of weakening.
Firemen reached the 78th floor of the South Tower of the World Trade Center on September 11, 2001, and at 9:52 a m. sent out the message:
"Battalion Seven...Ladder 15, we've got two isolated pockets of fire. We should be able to knock it down with two lines. 78th floor numerous 10-45 Code Ones (victims)."
It was Battalion Chief Orio Palmer of the New York City Fire Department (FDNY) on the radio. He and Fire Marshal Ronald Bucca managed to reach the impact zone before the tower collapsed at 9:59 a.m.
Palmer's radio message provided crucial information about the situation on the upper floors. How could "two isolated pockets of fire" cause what happened Seven Minutes later?
Was someone else monitoring the Fire Department's radio communications and concluded that putting the fires out could not be allowed, so they took 7 minutes to decide to activate their own radio controls?
Two Decades go by without discussion of the steel and concrete distributions! Why is the Eiffel ๐ผ Tower shaped like that?
Bang, bang, Smash!!!
You are under arrest umbrarchist for unauthorized paranoid speculation!