re: Real bad condo collapse in Surfside, FL

Update the link. This collapse was in Surfside. And holy shite I drove in front of it last night

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Sand is 2nd to rock in terms of best building base

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unless liquification comes into play.

Hug your family tighter today you never know when it’s your time

Can't get over how abrupt and catastrophic this failure was.
How long has it been hanging on by a thread? You don't expect things like this to happen in this country.

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We do use epoxy-coated rebar in all saltwater regions, though.

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i was watching a presentation on youtube talking about how this professor hates epoxy coated rebar. Explained how it is impossible to be fully coated with the non repaired gouges it will inevitably get. Which means the area will corrode by volume the same as the whole surface area(non coated) would and substantially increase the likely hood of failure at that spot. His reasoning was sound. But it is so widely used, if these was an issue you would see more issues.

I also watched another presentation of adding anodes tied to the reinforcing as the sacrificial area. increases maintenance but could be something helpful in extremely corrosive environments.

I'm sure it has been posted, but here is video of the collapse.

Twitter vid

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Looks like it fell down and away from the rest of the structure like the outside columns gave out. They would be the most exposed to the salt air, but you would think some major cracking and spalling from the rusted rebar would have been noticed. I also wonder if they may have placed the rebar incorrectly on the floors or columns. The other thing I thought of was if they used post tension on the floors and in their "renovation" work accidentally cut some of the cables.

Fun concrete rebar rust reading info: Corrosion of Embedded Materials

I hope they find more survivors, but that pile looks pretty flat.

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that failure look too abrupt to be a rebar corrosion issue IMO.... UNLESS there was major signs of this corrosion that went unrepaired. If there was a major reno going on, that more then likely was the cause, took out something they shouldnt have, too much live load, etc.

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structural integrity of the building's core.

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you are just saying fancy words.

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If that can cause a catastrophic collapse...

I can't imagine a building of that size can last 40 years if it was that terribly built.

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I would think it very unlikely, unless there some some serious deterioration going on as well. Or if said resident was driving a full garbage truck.

That is so freaking awful. There's going to be a ton of people in that rubble. You think you're safe in your home yet something like this happens. Unreal.