Thailand/Myanmar Earthquake: VIDEO Dramatic collapse of a high rise in Bankok 2

[human909]

I have no engineering commentary at this stage. But this does capture a near complete collapse:

https://twitter.com/x/status/1905511502435791007

https://twitter.com/x/status/1905515797234991340

 

[Comcokid]

Chinese steel fails second safety test in Thai collapse probe
https://thethaiger.com/news/bangkok/chinese-steel-fails-second-safety-test-in-thai-collapse-probe

 

[FacEngrPE]

Bangkok’s Collapse Scandal: Fake Steel, Chinese Builders, and a $60M Disaster
China Spotlight
Per this, there are all sorts of engineering, material, and administrative misdeeds.

The construction (generic picture below) if correct is a type I expect is more sensitive to construction details and workmanship than construction more common in earthquake areas.
​

 

[epoxybot]

According to the statement, the thickness of the shaft's walls was reduced to align with the proper building standards for the interior architecture.

Elevator shaft walls now in focus

The State Audit Office (SAO) has issued a statement explaining the decision to reduce the thickness of the walls of the elevator shafts at its new 30-storey building, which allegedly contributed to the structure's collapse during an earthquake.

www.bangkokpost.com

 

[Sym P. le]

The thin wall theory plays nicely into the out of phase oscillation theory (with the west adjoining bridge structue). A thin wall offers less resistance to lateral forces and can bow or fatigue easier, or rebar pullout can leave a much smaller percentage remaining to support the vertical load. If, on top or these issues, the concrete is substandard and even the steel is substandard, it sets up the ensuing spectacle perfectly.

 

[Alistair_Heaton]

I seem to remember there is something to do with buckling as well.

This seems to remember is from watching a paper given by PRof Jim Rhodes on thin walled steel structures 25 years ago...

 

[1503-44]

Saw this article today. Super.Shear Earthquake. It's good.

How a ‘supershear’ quake tore through Myanmar

Data reveals why last month’s earthquake was so devastating

www.reuters.com

 

[1503-44]

A "SUPERSHEAR earthquake".

How a ‘supershear’ quake tore through Myanmar

Data reveals why last month’s earthquake was so devastating

www.reuters.com

 

[racookpe1978]

Penthouse - and its cover slab - had no sway bracing, no sideways resistance to anything but the falling rain. Not the cause, but probably symptomatic of the basic building design all around. Inside, the center was falling into itself as the upper fell as a complete "unit".

Like the opposite of the World Trade Center: Here, the lowest supports under the center of the lowest floors collapsed, pulling the center down, which pulled the outside two sections down.