with out seeing the specs for the project do not know what type of steel was used !! was boron added ? just plain carbon steel ??  both types of steel are used in rebar and have diffrent propertys and different applications  so its all assumptions ? there are many test yet to be done before you can say the rebar was unsuitable for the project or not

1 hour ago, MikeandDow said:

with out seeing the specs for the project do not know what type of steel was used !! was boron added ? just plain carbon steel ??  both types of steel are used in rebar and have diffrent propertys and different applications  so its all assumptions ? there are many test yet to be done before you can say the rebar was unsuitable for the project or not

 

I think Anutin was smart when he said the investigations would take months.  Both the collapsed building and inspecting thousands of other buildings for damage.

 

I'm just a mechanical engineer (not civil), but I suspect the reason the building collapsed was the state of construction where not all of the structural members were in place yet.  But I'll wait for the full investigation.  Though I have little confidence that we'll ever really know.  Too many powerful entities stand to lose too much if the truth goes against them.

 

16 minutes ago, impulse said:

 

I think Anutin was smart when he said the investigations would take months.  Both the collapsed building and inspecting thousands of other buildings for damage.

 

I'm just a mechanical engineer (not civil), but I suspect the reason the building collapsed was the state of construction where not all of the structural members were in place yet.  But I'll wait for the full investigation.  Though I have little confidence that we'll ever really know.  Too many powerful entities stand to lose too much if the truth goes against them.

 

If you read the news you will see that the building was topped out  which means it was  structurally complete no more concrete pours in april 2024 the concrete was a year old max cured, looking at the photos there is one test i would do first off is concrete bonding test to ASTM  lots of rebar bare no bonding to concrete

In my experience with civil & high rise construction contracts in different contries, the Head Contract will specify the Standards materials are to be tested to. This has to be followed up with back to back subcontracts with testing at least equal toj or better than that Standard specified in the Head Contract - & demonstratively so. Otherwise the subcontract is in non-compliance with the Head Contract.

 

In India, the chain of testing used to be that even the iron ore mine from where the raw material was sourced had to be compliant.

 

The first Google search for Thai standards gave me this chart, which lists ASTM, BS, ISO & JIS G standards on which these Thai standards were based.

 

This chart is part of the ASEAN Main POrtal at https://asean.org/

 

It is useless discussing what standards apply because, as mentioned, they will be listed in the Head Contract. Everything flows on from that.

 

A saving face circle jerk between Thailand and China.

 

Two comments.

1  Most of the standards for steel relate to ultimate tensile strength and yield strength (in tension). From the videos there was no sign of a failure in tension.

2  With regard to bonding, the 20,000 tonnes of reinforced concrete which fell would have recahed a velocity of well over 100 km/hr. Not much concrete would bond to steel after such an impact.

What a surprise, another Chinese company cuts corners in the name of profits while putting lives at risk.  Throw the entire management team in jail for decades so they will have plenty of time to think about what they did.