should the world trade center have fell how it did?

Answer 1

First you must understand that structural steel looses approximately 50% of its strength at 1100 degrees F.
That is why it is covered with an insulating material - so it will resist the heat of a normal high rise fire. This insulating material was obviously damaged when the plane bashed through almost the entire width of the building and the resulting fire - fueled by a fully fueled airliner and all of the flammable materials inside the offices - weakened the steel and the weight of the floors above plus the aircraft did the rest.
Gravity was the only force the building was subjected to - and that's pretty much straight down - and if no other forces were present, that's the way the buildings going. This effect is often referred to as "pan caking."
There's a huge difference between the static weight of an object and the instantaneous impact when it collapses onto a floor below. This is easily apparent when you place a hammer, or several hammers for that matter, onto a nail. Obviously, the nail holds the weight easily - now let the hammer swing down and strike the nail - into the wood it goes. The weight of the hammer didn't change but the instantaneous impact did, and that's why the buildings fell.

Answer 2

Those buildings were designed to be able to stand for one hour in a fire. At that point the steel gets too hot and softens untill it can not hold a load. Because of the impact and the large amount of jet fuel, they actually only lasted 45 minutes. Amazing that they lasted that long.

Answer 3

Well, some buildings may be built to withstand hurricanes or tornadoes or floods or earthquakes. None of those things are very common in New York (maybe blizzards..). Buildings aren't meant to be hit by giant, fast moving objects and it would probably be wasteful to build every building to withstand everything.

Answer 4

Do you know how many times this stupid question has been answered? Your use of the English language shows me that you must have at least graduated the 5th grade after several tries.