“How can a concrete deck building collapse straight down unless all the primary support columns fail at exactly the same moment?”
Your premise is faulty.
L
How pray tell? The thing fell like a planned demolition.
The only time I have seen concrete deck buildings pancake is when they get imploded.
You, apparently, have seen them pancake under different circumstances?
Please share that experience with the group.
Thanks in advance for new engineering insights.
Concrete can’t cut steel!!
/s