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.
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[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...