Chris Mohr,
If you want to know on which aisle the materials for building a doghouse are stocked in the store where Christopher7 works, then he is your man.
If you want someone to build a doghouse, then he MIGHT be your man. (It depends on how much you like your dog.)
If you want informed opinions on structural mechanics, velocity & acceleration analyses, reading for comprehension or objectivity, you'd be better served by consulting your dog.
Note: Remarkably, astonishingly, all of the above applies … EVEN IF YOU DON'T OWN A DOG!!
You can safely, reliably ignore all of his baseless assertions. "Repetition" is not an argument.
In fact, I would use Chris7 exactly as I used my old stockbroker. Man, if I could have figured out how to keep him happy, I'd have gotten rich...!
You see, most people are reliably inconsistent in providing correct answers to questions: occasionally right & occasionally wrong. And you never know which at any given moment.
A tiny number are pretty near always right.
And a slightly larger number are pretty near always wrong.
My old stockbroker was in the 3rd category. As reliable as the sun rises in the east, if he advised me to jump into this "can't lose stock opportunity", then it'd tank within a week.
He adamantly steered me away from Apple stock. "Never going to go anywhere."
Once you identify them, there are two really terrific things about people that are always wrong: 1. they are just as reliable as those that are always right and 2. they come a lot cheaper.
The difficulty with someone like a stock broker, you've got to keep coming up with excuses as to why you are always asking them for advice & then doing the exact opposite. I could only sustain that for about a year before he caught on, & his ego forced him to resign.
But I gotta tell ya, it was one GREAT year for tk's retirement fund. I never would have let him go if I could have figured out at that time how to manage it. (It occurred to me later: 2 stock brokers in 2 separate companies. One for advice, one for investments.)
Chris7 is to mechanics as my old stockbroker was to a stock portfolio.
You can, with a high degree of assurance, arrive at a correct conclusion thru the simple mechanism of inserting into or removing from the word "not" in his sentences.
You cannot realistically compare a heavy H beam and moment frame to a stick. It is an inappropriate analogy.
Wrong.
The analyses for load bearing, stress, stability, buckling, etc. are applicable for all materials.
Factors are tabulated within the analyses compensate for different materials, different shapes, etc.
This is the very essence of engineering: finding the analytical rules that apply to all materials, all shapes, all temperatures, etc. etc. etc.
Your assertion is gloriously wrong.
"like the sun rising in the east …"
The NIST model shows the columns buckling, not breaking like sticks, DURING the free fall acceleration period. This is conformation that their model is NOT falling at FFA as Sunder stated at the Technical Briefing.
Wrong.
The column ASSEMBLIES buckled, not the individual columns members.
Just like in the towers, they snapped (very suddenly) at their weak points: the connections between components. The columns lying in the rubble were, to all intents, straight 2 story segments. Just like they were manufactured.
The outer wall ASSEMBLIES did not all snap simultaneously. They snapped over a brief interval after the whole assembly buckled.
This had two effects:
1) the resisting force did not instantly go to zero, it gradually but quickly decreased. Then there were some oscillations as the some internal members of the core that detached earlier collided with horizontal members that were still attached to the outer walls.
2) And as a direct result of the above, that downward acceleration of the outer wall did not instantly go to "G", as something that was truly in free fall would. It gradually but quickly increased, oscillated above & below G, and then gradually decreased as the top of the buckled segment hit the ground.
But the individual columns? Well, they snapped like, uh, well, like sticks.
How about that?
Chris7 is gloriously wrong again.
"… like the sun rising in the east …"
tom