New Aerial Photos of Sept. 11 Attack Released

The Wall Street Journal ^ | 02-10-10 | The Wall Street Journal

[valkyry1]

This is a good image illustrating the span and truss construction of the original WTC. If I remember correctly a thin layer of concrete would then be poured over the metal deck, this would create a flooring and bond the entire floor into a lightweight stiff cohesive unit. As you can see though those flooring (spans) are only attached and supported at each end. When the structure was intensely heated for long enough the spans buckled and finally gave way at the attach points there was nothing to stop the momentum and the building ‘pancaked’ down.

I look at that design and I get the willys that they built a 1400' building like that.

The 9-11 conspirators try to make an issue that the jet fuel did not burn hot enough to cause this failure, but they ignoe that one the fires started creating their own convection currents it became like a wind tunnel or blast furnace and the temperatures could easily become hot and intense enough.

[naturalized]

You forgot the sarcasm tag.

[valkyry1]

Here are two picture of the Madrid tower, a 32 story skyscraper. It completely burned out over a 18 hour period and at the end the steel frame was still standing. It was not span and truss construction Think about it, a 32 story building that tonally burned out and does not collapse.

[TChris]

And, of course there were thousands of gallons of jet fuel involved in that fire too, like in the 9/11 attack, right?

[TChris]

I'm sorry for the tone of my previous post. I mistook your post for truther nonsense.

My bad.

[valkyry1]

No I am not a truth-er at all. My opinions on the design and construction WTC are based in fact though

[naturalized]

Smarter people than you and me disagree with your assessment:

The World Trade Center was not defectively designed. No designer of the WTC anticipated, nor should have anticipated, a 90,000 L Molotov cocktail on one of the building floors. Skyscrapers are designed to support themselves for three hours in a fire even if the sprinkler system fails to operate. This time should be long enough to evacuate the occupants. The WTC towers lasted for one to two hours—less than the design life, but only because the fire fuel load was so large.

A basic engineering assessment of the design of the World Trade Center dispels many of the myths about its collapse. First, the perimeter tube design of the towers protected them from failing upon impact. The outer columns were engineered to stiffen the towers in heavy wind, and they protected the inner core, which held the gravity load. Removal of some of the outer columns alone could not bring the building down. Furthermore, because of the stiffness of the perimeter design, it was impossible for the aircraft impact to topple the building. However, the building was not able to withstand the intense heat of the jet fuel fire. While it was impossible for the fuel-rich, diffuse-flame fire to burn at a temperature high enough to melt the steel, its quick ignition and intense heat caused the steel to lose at least half its strength and to deform, causing buckling or crippling. This weakening and deformation caused a few floors to fall, while the weight of the stories above them crushed the floors below, initiating a domino collapse. It would be impractical to design buildings to withstand the fuel load induced by a burning commercial airliner.

MIT

[TChris]

No I am not a truth-er at all. My opinions on the design and construction WTC are based in fact though.

Yes, and I appreciate the sharing of your expertise.

Thank you.

[valkyry1]

I am not saying that. I am not saying that a building should be constructed to withstand the heat generated by that much jet-fuel either.

What I am saying is other types of construction would not pancake down like that. once the failure occurred There were no other high rises ever constructed as the WTC’s were, and you will never see another high rise constructed in such a manner.

[EyeGuy]

Thanks.

Very informative.

So to my untrained eye, one of the major differences is that the span and truss design, while having sturdy enough vertical columns, lacks the heavy horizontal girders of true steel frame construction?

Excuse my terminology....

[naturalized]

What difference would that have made - add another couple hundred million for demo? You said the design gave you the willies when it went up - sounds to me like you were saying it was defective. You’ve persuaded at least one other person that it should have been built differently. I say no one should be giving anything but praise for the lives saved by this design.

[valkyry1]

That and the vertical supports for the flooring would be more than at the two attach points to the inner and outer core/walls.

[valkyry1]

I’m not saying anyone would intentionally build an unsafe high rise.

It was a new technology at the time and what made it attractive is that it was fast and cheap as compared to the more traditional methods.

It was beyond comprehension that maniacs would fly fully fueled and loaded 767’s into the buildings, and it was a bleeding indeed they held up for another hour.

[naturalized]

not trying to quarrel, but you are still saying it is unsafe. that just isn’t right. say what you will.

[Dajjal]

Never forget

[UCANSEE2]

What I'm asking is why didn't the owner of the photos release them immediately to the media?

A good question.

One that is best answered by a look at the MEDIA the US PUBLIC gets to see, and what the rest of the world gets.

Most of our 'media' is completely censored. Things like blood and gore are very rarely allowed in major media print, or on Newscasts.

FAKE gore and blood is allowed in movies, of course, as long as it doesn't show what it's really like, for instance, when you get shot in the head.

In the instance of 9/11, we were not allowed to see bodies hit the ground, nor what it looked like after they hit the ground.

The government/media thought it might make us 'freak' out.

There are many, many, many things 'kept' from the American Public.