Now let's check the plane at 2' above the footing, in which the amount of reinforcing lies in between & By inspection, the bars are still ok, since it has 2' length below this plane. Similarily the bars satisfy both for the plane at the wall-footing interface. The bars in discussion satisfy both strength & development requirements for the plane at 3' above the footing. RE: Moment along a rebar lap splice JSA2 (Structural)Īssume the wall is 8' tall with linear increasing earth pressure behind the wall, and assume the required development length is 2'. There are very few times where I have spaced reinforcing greater than 12". As others have stated, don't make it by such a gnat's behind. I can't figure out why you would need reinforcing 9" in your footing, and 18" in your wall. Hopefully, your footing is thicker than your wall. I say all of this because your original post doesn't make sense. If a key is required, the vertical reinforcing should be placed towards the toe of the wall. If reinforcing is needed on the toe side, it should be in the bottom portion of your footing (which is why most of us turn our dowels that way). The primary reinforcing in your footing should be in the top portion of your footing on the heel side. These dowels should have a Class B lap splice (1.3ld) into the wall, and be fully developed in your footing. Most of us turn the bend of the dowel into the toe of the footing. Never the less, it should transfer the moment into the footing. Tension in the steel pulling out of the footing, compression in the concrete pushing into the footing. The wall itself, basically creates a vertical force couple. That purpose is to transfer the moment from your wall, to your footing. In cantilever retaining wall design, the dowels coming out of your footing, serve one purpose and one purpose only. JSA2, I think you need to carefully consider your design.
And I thought I had a good grasp on retaining walls.
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