The 2018 Morabito report describes "failure" of the waterproofing membrane that would have normally protected the structural slab of the pool deck. I don't recall if they mentioned it in their report, but one of the big contributors to that failure (aside from the general lack of maintenance)...
I believe that Josh is suggesting that the collapse could have been precipitated by something as "benign" as the normal day/night loading cycle. For this to work, we must pre-suppose that the pool deck was teetering on the hairy edge of collapse for quite a while and that those thermally-induced...
As I understand it, the theory from Building Integrity is that the rebar connections into the pool deck slab along the south wall of the perimeter bathtub had been compromised. He points out a few early photos showing that the rebar had simply fractured (as opposed to 'zippering' from the...
Related to the drone video showing test rig and blue drop mass, here's an interesting description of the information gathered from Dynamic Load Testing (DLT):
https://www.youtube.com/watch?v=bTK-Im3FQ3M
The narrator speaks of "drilled shafts" (a terminology not much used in this thread)...
Yep; I can imagine that Tardis-like thing being lowered down into that rig as depicted in Nukeman's photo. Good work!
Here's a slightly-less potato-ey grab from that drone footage...
New live stream started at https://www.youtube.com/watch?v=Wl7xiMcYpQQ
Highlight so far is a guy attempting to corral water with his mini track loader.
Although this particular paper is focused exclusively on GPR, I would guess that X-ray imaging and destructive testing will be NIST's tools of choice for investigating the as-built reinforcement situation at Champlain Towers South. But no doubt there will be a huge uptick in demand for both GPR...
