Precast Concrete Wall Panel Sliding Friction at Base

[engjg]

Regarding Tilt-up concrete wall construction and in plane shear resistance at the wall to footing interface I note ACI 551_2R-15 comments:

"The coefficient of friction for factored sliding resistance between the panel bottom and the footing can usually be taken as 0.6. Supplemental positive connections between the panel and footing or floor slab include cast-inplace reinforcement dowels or welded connections. Where panels are subjected to seismic shear forces, the contribution of friction resistance may not be permitted by some building codes. In addition, connections between the panel and floor slab or footing is a compulsory requirement in many building codes, particularly for seismic forces."

Interested in whether others typically rely soley on friction?

Relying doesn't on friction alone doesn't sound like a great idea to me especially in high seismic; interested in whether anyone aware when and where do building codes i.e. IBC, ASCE 7 require connections?

Regarding precast construction following PCI guidelines anyone aware if they provide a friction or guidelines for this. I seem to recall they stated friction factor of 0.8 but can't find it mentioned in the 7th Ed PCI handbook.

 

[JedClampett]

I don't know which one of you walked off with my Tilt Up Handbook by Hugh Brooks , but I distinctly remember a base connection with just grout for leveling. Not just friction, but mostly.

 

[RPMG]

I believe that Seismic Design Categories C and above require a positive connection, and that SDC B does not. SDC A does not have seismic requirements.