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Originally Posted by javadog
What we were discussing there has no bearing on what took place that caused the failure that led to the building falling. It was just an interesting observation from some of the photos that were published.
I would guess that the slabs in between the columns will probably be somewhere around 9 inches thick. They likely had both upper and lower mats of reinforcement steel. Ordinarily, you look for about 3 inches of cover as a minimum, for any rebar. Let’s leave aside the notion that the way that most slabs are designed pretty well guarantees that there will be some deflection/creep over time.
One thing that interested me was the possibility that the rebar may have been placed incorrectly, which might be symptomatic of poor construction quality.
The other thing was whether or not they ran rebar the other direction. I’ve seen instances where engineers left it out of the drawings, or contractors failed to put it in. It’s also possible that it was laid above the bars that pulled out, and is still there. Hard to tell without better photos.
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I’m hearing stories of shoddy workmanship in soflo back in the day.