Would use of a corner bar in standard hook shorten the development length? 3

[thejonster]

I'd love to reduce the dev length for my retaining wall bars in the footing making a more efficient use of concrete using a longit bar in the corner of my standard hook. This would be analogous to a stirrup hook, which works in beam shear with small dimensions, right? A force is a force. It's not allowed by ACI318 for standard hooks, but perhaps a conversation should be started to make that a new reduction factor

I'm usually good at finding pertinent discussions, but can't find anything in the forum on this

 

[BridgeSmith]

I'm curious, does ACI have the same 0.8 reduction factor on the required hook development length that AASHTO has for cover > 2.5"? (From the horizontal leg of the hook to the bottom of the footing)

We usually don't have difficulty meeting the development length required within the footing thickness required by shear, once that reduction factor is applied.

 

[thejonster]

ACI 318-19 25.4.3.4, requires 2.5" clr or confinement

There is a 1.6 penalty for omitting confinement if spaced too closely