Reshoring - Utilizing Superimposed Dead Load 1

[Struct123ure]

Hi,

I am working on a reshoring project and was wondering if I can take the SDL(Superimposed Dead Load)+LL(Live Load) as the slab capacity to calculate the number of floors that I need to reshore?
After looking at posts on this website such as

https://www.eng-tips.com/viewthread.cfm?qid=437860#post,

and reviewing ACI 347.2R-13; I don't see them use the SDL/SID(Superimposed Dead) in their calculations. But most floors have 1kPa for partition allowance and on residential floors designed for 1.9kPa having 1+1.9=2.9kPa is a big difference from 1.9kPa.

Example:
Level 8 pour weighs 0.48+6+3.1=9.58kPa(Self Weight of Formwork+Conc.+Const_LL). And all the floors below are designed for 1.9kPa(no live load reductions). My preliminary calcs would be 9.58/1.9 = 5.04 interconnected slabs (1 level of shoring/Formwork and 4 levels of reshoring).
But the slab was designed for SDL=1kPa and LL=1.9kPa. Partitions, ceilings, flooring isn't going to be put up while there are re-shores everywhere.
So this means 9.58/(1+1.9)=3.3 ~4 interconnected slabs (1 level of shoring/Formwork and 3 levels of reshoring).
If it's not used, please let me know why or why you wouldn't personally do it this way?

 

[Struct123ure]

I ended up finding a resource attached which takes the LL+SDL capacity in the example.
I assume then that this is typical practice.

 

[Enable]

Yes you can as long as the contractor is otherwise barred from adding additional weight onto the reshored slabs (fairly typical). Usually a note about barriers and the like to prevent such loading is added.

From your profile I see you're in my Province. It might be worth noting that three levels of reshoring is typical for our area, so if that's what the math says you're probably on the right track.