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The WTC towers were designed with having that in mind (airliners). The notion that airliners could hit is since they are like 3miles up somthing. The had steel core columns which all would have needed to be weakend at the same time. North and South tower didnt have falling debris on them except for buliding 7 but that shouldnt cause any of them to go down demolition sytle.
Sort of.
Back in the Sixties when the WTC was under construction, the proximity of three major airports gave rise to the "what if" scenario of a plane accidentally hitting one of the towers in bad weather. An exercise was performed to calculate the likely amount of damage in such a scenario, and it was determined that the damage from such an event would not be catastrophic. No records exist of this exercise. It is only in the memories of people who worked on the project back then.
No one ever anticipated fully-fueled commercial jets being flown dead-on into the buildings at high speed.
They really didn't go down "demolition style". A controlled demolition company that destroyed and damaged so many adjacent structures would have been sued up the wazoo for such a messy job.
Here's my issue... As an engineer, I don't think is possible for a plane to crash into a building and after X time make the building collapse on its own as if the columns desintegrated.
Have you ever looked at the size of the hole in the side of either of those buildings? You should know that the WTC was a unique structure, once you have failure of any column there is nothing left to hold that span up. It's amazing to me they stood at all. All that weight is being transferred to either side of the hole. It's a tremendous amount of structure missing given the design of the WTC.
^ I remember looking up at that hole once I got a couple of blocks away and saying to my escape-mate, "I don't think they are going to be able to fix that."
Understatement of the day.
And a good point--the exterior of the building was part of the support structure.
Provide 500 lbs of collective airplane parts from four 757s. It should be easy, no?
Things tend to disappear when they hit stuff at high speeds. You have the impact into the building itself and then what amounts to a grinder during the collapse. Aluminum easily melts and a lot of that plane was made of flammable material. In the end it would be very hard to distinguish plane parts from building parts.
Here is what happens to a plane when it hits a wall at 500 MPH.
The WTC towers were designed with having that in mind (airliners). The notion that airliners could hit is since they are like 3miles up somthing. The had steel core columns which all would have needed to be weakend at the same time. North and South tower didnt have falling debris on them except for buliding 7 but that shouldnt cause any of them to go down demolition sytle.
They were not designed for a fully loaded 757 hitting it. The inner core was a concrete and steel however the WTC had an open floor plan design making it very unique. AFAIK there is no skyscrapers in the world built like they were. The floors spanned from the inner core to the steel on the outside. When you lose the outside structure there is nothing left holding everything above it up. Not only that the floors themselves were an integral part of the structure providing tension to the outside skin.
They were not designed for a fully loaded 757 hitting it. The inner core was a concrete and steel; however, the WTC had an open floor plan design making it very unique. AFAIK there is no skyscrapers in the world built like they were. The floors spanned from the inner core to the steel on the outside. When you lose the outside structure there is nothing left holding everything above it up. Not only that the floors themselves were an integral part of the structure providing tension to the outside skin.
Here's a typical WTC floor showing the open floor plan. Note no columns. The core with the elevators, staircases, and restrooms was in the center.
It was an outside job--c'mon folks, we all saw it happen. The black boxes weren't found because of the huge explosion, and then the collapse of the towers and all that debris. There were plenty of things and people that were never found or recovered from that tragic day.
Frankly, I think it is disrespectful to say this was an inside job. And if W. wanted to invade Iraq, he wouldn't need to think up such an elaborate scheme to do it. Besides, he wasn't smart enough to think of doing something like this.
They were not designed for a fully loaded 757 hitting it. The inner core was a concrete and steel however the WTC had an open floor plan design making it very unique. AFAIK there is no skyscrapers in the world built like they were. The floors spanned from the inner core to the steel on the outside. When you lose the outside structure there is nothing left holding everything above it up. Not only that the floors themselves were an integral part of the structure providing tension to the outside skin.
In the interest of ensuring accuracy, it should be said that there was hardly any concrete in the inner core. Most of the structure's concrete was from the floor slabs.
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