Slab pour stages 2

[NE_PE]

I am a new PE, slightly more experienced in Steel, compared to concrete. So, my question is, I received a Slab pour plan submittal for review, for an elevated concrete slab. The pour is divided into 3 areas. How do I evaluate this submittal? What should I keep in mind about slab pours areas and breaks between the areas?
Anyone shedding light / sharing resources/ links to the resources would be tremendously appreciated!
Thank You!

 

[KootK]

1) Does the pour sequence match your expectations with respect to limiting shrinkage strains in the slab that will develop between points of lateral restraint such as core wall assemblies etc.

2) Do the joints between the pour satisfy you with respect to their ability to transfer the design forces in your slab at those locations across the joints? Flexural continuity, shear friction etc.

3) Will bits of partial floor plate be laterally stable on their own in the temporary state or does the contractor need to sort out an alternate, temporary erection stability plan?

4) Will the joints have an aesthetic impact that may lead your client to prefer them in one location over another?

5) Will the joint location suit efficient formwork and rebar placements? If it's the contractor proposing the layout, this part can probably be left to their discretion.

5) I believe that ACI directs us to place such slab joints within the middle third of the span. Fact check that to see if I've remembered the ration correctly and whether or not that is flexible or inviolate. The goals, of course, are:

a) To place joints at locations away from points of maximum shear to ease the demand on the connection:

b) Hopefully to place the joints at locations where there isn't a whole lot of top steel so that rebar continuity at the joint is easier to maintain.

c) To avoid placing joints near columns where there is a high density of top steel that would need to be made flexurally continuous across the joint.

 

[hokie66]

Agree with KootK. Place the joints where shear is minimal, at or near midspan. The size of pours is typically limited by placement and finishing capacity.

 

[NE_PE]

Thank you @KootK for a detailed explanation. This is mighty helpful! Exactly what I was trying to learn!

Thank you @hokie66! I appreciate your suggestions!

 

[KootK]

Happy to help NE_PE. You might do some googling around the name Bruce Suprenant. He publishes a lot of free and uncommonly practical articles in the arena of concrete constructability. As you've probably come to realize, it's exactly this kind of stuff that trips you up when you're a rookie. You can probably design a razor thin slab in an afternoon to perform well under the weight of a space shuttle. But, then, somebody asks you to review something simple like a pour sequence and you're stuck with you thumb up your butt because they didn't cover that in school and few write textbooks about such mundane things.

 

[MSUK90]

You might do some googling around the name Bruce Suprenant.

This is an amazing reference. I have just went through some of his articles and they are awesome.
Thanks a lot KootK.