Concrete Wall Upgrade

[macan1]

For seismic upgrade, new 150 mm thick concrete wall will be attached (bonded) with existing 250 mm concrete wall.
15 M horizontal rebar dowels will be provided (Hilti HY-150 into existing concrete wall, rebar projection with standard hook in new concrete wall).
What is the "force" required to connect the new and existing wall, so that the two walls would act together (composite).
The "force" would be used to design the rebar dowels for shear friction and rebar spacing.
What is the "force" (or requirement?)

 

[14159]

Are you sure they have to act compositely? What provision is forcing that?

Given no standard to tell me what to do, I would have to make up my own approach. I think I'd use stiffness to determine how much of the load goes to each wall and use that to figure out how much the connection must transfer. I assume that the load first goes into the original wall. Say that's 100 kips for an example. If the new wall is 40% of the total stiffness, then you have to force 40% of 100 kips across the interface. I'd have to be more familiar with your problem to be sure that this is correct for your situation, but it's a start which beats the current crickets.

There's another thing to consider. Your new wall is only about 6" thick. With any amount of cover, you're going to have trouble developing the bars in the new wall.

14159