How can we interpret witness reports of buckling?

[Jedo]

The following witness report of the collapse of 7 WTC, that included a mention of buckling, is taken from the blog https://undicisettembre.blogspot.de, recommended by @Oystein in another thread:

Undicisettembre: Did you see WTC7 collapse? What do you think of it? Did you notice anything suspicious?

Daniel Rodriguez: I was standing in front of it. It was severely burning, it was on fire and I remember that when it fell I was looking at it. The glass was shattered from the ground up, it buckled on the left side and it went down from the left to the right. From what I saw I can tell you that it fell because the heat compromised its stability and it fell.

There were no explosions like in controlled demolitions.

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I felt quite confident that this is some valuable witness report that corroborated the NIST findings of buckling, like shown in this picture:

However, by checking the Oral histories on the N.Y. Times website, which luckily exists also in a compiled and searchable single pdf file on archive.org (maybe complied by someone in the truth movement?), I found several other references to buckling, however, this time only related to the collapse of the Twin Towers:


Supervisor Fire Marshall Brian Grogan

At that point I looked up, and it was Joe Pasquarello grabbed me, and he gave me a pull on my arm. He said, "Get the fuck out of there."I looked up —
Q. Were you still on West Street at this time?
A. Still standing there. The building just started coming down. It buckled.
Q. Are we talking about —
A. Two World Trade Center.
Q. The south tower.
A. It started coming down.

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Firefighter Scott Holowach

Shortly after that, sure enough, I heard -- I don't know even -- I guess a rumbling sound. I looked up and I see the whole 70th floor basically like buckle out and start crumbling down the outside of the building. At the time I grabbed two other guys and said let's get the hell out of here. We dove into the building and after the rumbling stopped --
Q. Would have been south tower collapsing?
A. The south tower.
Q. You could see it from your position?
A. Yes. I visually watched the 70 floor. It looked like almost it was buckling outwards and then it just went down the outside of the building, just like scaled the outside of the building and it just started pancaking and that's when I grabbed the two guys and the third guy followed us in.

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Firefighter John Moribito

But only after about 15 minutes and after running about two or three blocks away from the trade center, I started to see the top of 1 World Trade Center began to buckle, and at that point I thought the building was going to come down towards the north, and I wasn't far enough away at that point, and I needed to continue to run

So I got back up with the rest of members from Ladder 10 and Engine 10, and we started to run further from the building, and then the building had come down upon itself, and at that point, we realized that now it was time to turn around and go back to the building to look for members that were possibly injured or pinned.

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Firefighter Dean Beltrami

After awhile, I got, I heard the word catastrophic collapses occurred, and then I realized that one building -- that would be the south tower --came down, Building 2. […]
We began to walk. Pretty much my whole battalion was walking down the Westside Highway together. When we got to about a block, say about a block and a half north of the north tower, in between Barclay and Vesey Street, we dropped our gear to get ready to enter the buildings, and the lieutenant and officers that were with my battalion proceeded to try to report in to the chief.Just maybe about a minute had gone by, and somebody said, "Look, the building is starting to bulge." We looked up, and you could see the entire facade starting to buckle on the upper floors.Immediately nobody said anything. We just turned and ran as fast as we possibly could.

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Now what makes me wonder is whether these reports all refer to the phenomenon of buckling as it is understood in the NIST reports.

The Merriam Webster Online Dictionary has the following definitions of the verb to buckle (which could make sense here):

3 : to bend or move usually under the influence of some external agency -

• wheat buckling in the wind

4 : collapse

• the props buckled under the strain

5 : to give way : yield

• he buckled under pressure

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So my questions are:

1. Is there video or photographic evidence the Twin Towers had some buckling too?
2. Can 'buckling' be understood in a more general way or is it always meant in the oral histories I've quoted in the way NIST uses it for describing the phenomenon how the columns or the external frame of WTC 7 buckled in the NIST simulations?

 

[Jeffrey Orling]

What strikes me as odd about these quotes is that they were able to identify the floor which "buckled" from close to the building at street level. Maybe they should have said 3/4 from the bottom or similar. These quotes sound like people talking and don't know how to describe what they saw.

 

[Mick West]

What strikes me as odd about these quotes is that they were able to identify the floor which "buckled" from close to the building at street level. Maybe they should have said 3/4 from the bottom or similar. These quotes sound like people talking and don't know how to describe what they saw.

Only one of those interviews mentions a specific floor. The interview was five weeks later, and he may well have incorporated the videos and descriptions from the constant TV coverage into his account.

 

[Jeffrey Orling]

Only one of those interviews mentions a specific floor. The interview was five weeks later, and he may well have incorporated the videos and descriptions from the constant TV coverage into his account.

Maybe... but it wasn't the 70th floor...

 

[Mick West]

So my questions are:

1. Is there video or photographic evidence the Twin Towers had some buckling too?
2. Can 'buckling' be understood in a more general way or is it always meant in the oral histories I've quoted in the way NIST uses it for describing the phenomenon how the columns or the external frame of WTC 7 buckled in the NIST simulations?

1. Just the inward buckling/bending. Seen at 1:20 here:
Source: https://www.youtube.com/watch?v=TJJPYTVjxug


2. People are going to use "buckling" to mean a range of things. It think in the context of the towers it's more used as a descriptor for sudden loss of support. It's not a common everyday word, and most people will encounter it in the semi-figurative usage of a person collapsing, "their knees buckled" — i.e. a sudden loss of support.

 

[Mick West]

Even in a structural context, there's two very distinct types of buckling. There's slender column buckling, which in the WTC case would happen over several floors. Then there's local buckling, which a shorter section of a box column might experience.

What you mostly see in the collapse of the towers is the exterior sections coming apart at the joins. Kind of bucking like a knee does.