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Shear Strength of Concrete Wall

Shear Strength of Concrete Wall

Shear Strength of Concrete Wall

(OP)
Hello,

I'm currently reviewing some calculations on a retaining wall. The engineer is checking Vu against (0.5 * Φ * Vc). They are basically using this to say that they don't need shear reinforcement. I always thought that this only applied to concrete beams. For walls and slabs, I just check Vu against (Φ * Vc) to make sure I don't need shear reinforcement. With the other engineers approach, you either end up with some weird stirrups or really thick retaining walls.

Let me know what you guys think.

RE: Shear Strength of Concrete Wall

For thin elements like slabs or retaining walls you don't need shear reinforcement if the shear is less than phi*Vc.

RE: Shear Strength of Concrete Wall

It would be unusual to have shear reinforcement in a retaining wall. Usually the wall is just designed to be adequately thick to work without shear reinforcement.

RE: Shear Strength of Concrete Wall

ACI 318-11. 11.9.1 states shear out of plane for walls is to be per slabs in 11.11. 11.4.6.1 states the exception to the 0.5φVc rule for slabs, which I would extend to apply to walls based on 11.9.1.

RE: Shear Strength of Concrete Wall

The base and wall both act as beams.

The CRSI Design Handbook uses Vc=phi*2*sqrt(f'c)*12*d, which is compared to factored Vu.

RE: Shear Strength of Concrete Wall

(OP)
Thanks for the discussion on this. I'm going to talk with the original engineer about not using the (1/2) check.

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