For instance:

Eight people injured, two critically, after building owned by Yale University collapses while construction crew was pouring concrete on second floor
Daily Mail ^ | 6/02/23 | Kamal Sultan

A Yale University building under construction in New Haven, Connecticut partially collapsed on Friday and left eight people injured with two of them in critical condition.

The collapse happened at an apartment block on Lafayette Street at around 12.30pm when crews were pouring concrete.

Part of the second floor fell into the first floor and into the basement at the building site where 36 people were working.

The comments provided an education better than Yale’s, and for free:

Engineering diversity is our strength?

Big difference between the weight and integrity of heavy wet concrete and dry hard concrete …..
never load from the middle and always use temp support

I’ve see 6 inch deflection in steel structures just pouring 4 inch floors.
HVAC guys will complain the most …..

6 inch deflection?

I used to install fuel ust’s. 2 inches would be a major issue…. Same with the guys installing shoring for the tank holes.

The structural engineer cannot control the actions of the contractor.

The inspector can.

I’ve seen a lot of concrete placed for highways, bridges, industrial buildings and institutional buildings.

Depending on the structural design, certain requirements exist like the length of the weld to tie floor joists to embeds or other steel.

I’ve seen contractors try to glue embeds in walls and use the same epoxy incorrectly for anchors that weren’t compatible.

Was the Q deck correct?

Was the pump operator in communication with the concrete crew?

Was a slump test done with the result being within spec.

I’m curious.

Maybe they forgot to calculate the factor of safety needed to withstand a heavy point load on the floor system. Or they forgot to factor in the weight of the concrete as part of the floor system.

As for contractor, I guess they forgot to toss their air vibrator in the pour to settle the concrete.

The architect only left the MEP guys 1” of slop to get in the lights + sprinkler + ductwork, so they’re probably justified in griping.

Egg up a fiberglass or frp-coated tank, your ass was in a sling. Liability was 10 million. You did it right or you didn’t do it at all.