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Your pagination seems off. different book p.121, regarding the WTC as an example of a "framed tube": 4.3.3.3 Connection Between Exterior Tube and the Central Core As shown in Fig. 4.15, the perimeter tube and central core was linked by composite trusses floor system. The floors consisted of 10...

Could you quote that part? You did quote, "the distance between the exterior and the core frames is spanned by beams or trusses". Am I wrong in assuming that the floors took on that role for the WTC towers?

Why? this goes directly to the heart of your "WTC=monolith" understanding! The obvious conclusion is that your ignorance of the actual WTC structure is central to your beliefs.

Yes. Because if you do not deal with it, you get "The shear lag effect greatly reduces the effectiveness of the framed tube" (Fu). And because shear lag is "due to the flexibility of spandrel girders and columns" (Fu), you deal with shear lag by bracing these, reducing their flex. (i) braced...

Bigfoot might not be from these parts… The idea that Bigfoot is a yet-to-be-discovered North American bipedal ape is hard enough for most people to believe, but to imply that the big guy is really an alien makes it even harder for people to fathom. But, if you think about it, the idea that...

Paraphrased: if you can find a safe way to transfer the overload on the floors onto the vertical columns, your design may be safe against progressive total collapse. I wonder how they plan to accomplish this without diagonal trusses through that office space. Edit: the design devotes a whole...

Yes. So why don't you? Feng Fu, in Design and Analysis of Tall and Complex Structures, 2018 However, due to the flexibility of spandrel girders and columns, there is a shear lag effect, with a hyperbolic-type stress distribution in the plan cross section. Therefore, when the exterior framed...

By Christian Simensen, published in a journal: A theory for the collapse of the World Trade Center June 2014 Engineering Failure Analysis 41:39–47 DOI:10.1016/j.engfailanal.2013.07.032 Two airplanes of type Boeing 767 flew into the Twin Towers in the morning of September 11th 2001. The crashes...

By Christian Simensen: A theory for the collapse of the World Trade Center June 2014 Engineering Failure Analysis 41:39–47 DOI:10.1016/j.engfailanal.2013.07.032 Two airplanes of type Boeing 767 flew into the Twin Towers in the morning of September 11th 2001. The crashes caused fuel to ignite...

Yes, but you are asking for details that go over your head, and for these you will need to work through the report, instead of accusing NIST that they don't gave a firm grasp of them. You can't get to knowledge by shortcut. There is no "quantum mechanics for people who skipped physics", and if...

Not always. Looking for bigfoot relatives, I found out there's a newly discovered species of water bear: A newfound species of tardigrade, or "water bear," with tendril-festooned eggs has been discovered in the parking lot of an apartment building in Japan. Kazuharu Arakawa, a researcher who...

No. Stereoscopy aside, the flat picture does correspond to what the eye sees if your eye is at the correct distance to the picture, such that the frame edges maintain the 60⁰ viewing angle. If you move the picture closer or farther away, it will start to feel distorted. (This usually happens...

Summaries tend to brief. It's also worthwhile to read the rest of it, not just the one page. Search for "core" in the PDF document, you will find the other places in the index (at the front of the document) that show you the relevant sections. They didn't need to include it in the FAQ because...

@Mick West I've had this happen several times recently, the latest is at https://www.metabunk.org/threads/would-the-wtc-twin-towers-have-collapsed-from-fire-alone-without-plane-impact.12533/post-275195 it looks fine at first, then when I come back later, the image fails to display. this...

this may be because people don't frequently ask about it, and also because it is covered extensively in NCSTAR 1-6. From the index: I wish you guys would spend a fraction of the time you write here on studying the sources. I'm sure you'd find any support you'd need here to help you work...

lacks evidence / 100% speculation / physically impossible (unlike dark matter)

sweet example of damage explosives could never do!

"lateral" still means 2 dimensions, only 1 if which the spandrel plates really provide for the corners are strong because the corner angle provides the missing dimension, but it gets worse the further away from the corner you go (consider leverage) it would have helped your quest for "load path...

it's the lines I disagree with

use anecdotal evidence