Post Tensioned Elevated Slab to Shear Wall connection 1

[WDM]

I am looking for insight into the best way to connect multi-level PT concrete floors to concrete shear walls. I'm told that using standard hooks from the wall into the slab is not desirable as it may cause cracking during slab post-tensioning.

One engineer suggested using oversized sleeves, passing the vertical wall reinforcing through it, and grouting after post-tensioning. I'm concerned adequate shear transfer capacity would not exist since the bars are not developed in the slabs.

Any suggestions are appreciated.

 

[Taro]

There are many ways to mitigate the effects of restraint cracking (locate walls near the middle of the floor plate, provide bonded reinforcing to control cracking, delay connection of the floor to the walls, etc.). PTI publishes "Restraint Cracks and Their Mitigation in Unbonded Post-Tensioned Building Structures" by Aalami that covers this topic.